we can type all the letters!

Cargo.toml

@@ -8,5 +8,4 @@ edition = "2021"
 [dependencies]
 bdf = "0.6.0"
 bitvec = "1.0.1"
-iced = { version = "0.12.0", features = ["canvas", "smol"] }
 minifb = "0.25.0"

src/cpu.rs

@@ -1,14 +1,12 @@
 use crate::error::{ExecutionError, GeorgeError, GeorgeErrorKind, MemoryError};
 use crate::instructions::{get_instruction, Instruction};
-use crate::memory::{self, Mem};
+use crate::memory::Mem;
 use crate::types::{Byte, Word};
+use std::path::PathBuf;
 use std::process::exit;
+use std::sync::Mutex;
 use std::time::Duration;
-use std::{
+use std::{str::FromStr, sync::Arc, thread::sleep};
-    str::FromStr,
-    sync::{Arc, RwLock},
-    thread::sleep,
-};
 
 #[derive(Clone, Copy)]
 pub enum StatusFlag {
@@ -31,13 +29,13 @@ pub struct Cpu {
     pub p: Byte,  // Status Register
     pub irq: bool,
     pub nmi: bool,
-    pub memory: Arc<RwLock<Mem>>,
+    pub memory: Arc<Mutex<Mem>>,
     pub pending_cycles: usize,
     cycle_count: usize,
 }
 
 impl Cpu {
-    pub fn new(memory: Arc<RwLock<Mem>>) -> Self {
+    pub fn new(memory: Arc<Mutex<Mem>>) -> Self {
         Cpu {
             a: 0x00,
             x: 0x00,
@@ -59,14 +57,14 @@ impl Cpu {
         Ok(())
     }
     pub fn read(&self, address: Word) -> Result<Byte, MemoryError> {
-        let memory = match self.memory.try_read() {
+        let memory = match self.memory.lock() {
             Ok(read) => read,
             Err(_) => {
                 println!("Couldn't acquire read lock on memory in cpu thread");
                 return Err(MemoryError::NoDataAtAddress);
             } // TODO: upgrade this error type to a `GeorgeError` and make an errorkind for thread lock errors
         };
-        memory.read(address)
+        Ok(memory.read(address))
     }
     pub fn read_word(&self, address: Word) -> Result<Word, MemoryError> {
         let low_byte = self.read(address)?;
@@ -95,7 +93,7 @@ impl Cpu {
 
     pub fn pop_stack(&mut self) -> Result<Byte, ExecutionError> {
         let byte = self.read(self.stack_addr())?;
-        self.s += 0x1;
+        self.s = self.s.wrapping_add(0x1);
         Ok(byte)
     }
 
@@ -121,21 +119,21 @@ impl Cpu {
     }
 
     pub fn write(&mut self, address: Word, data: Byte) -> Result<(), MemoryError> {
-        let mut memory = match self.memory.write() {
+        let mut memory = match self.memory.lock() {
             Ok(write) => write,
             Err(_) => {
                 println!("Couldn't acquire write lock on memory in cpu thread");
                 return Err(MemoryError::NoDataAtAddress);
             } // TODO: upgrade this error type to a `GeorgeError` and make an errorkind for thread lock errors
         };
-        memory.write(address, data)?;
+        memory.write(address, data);
         Ok(())
     }
 
     pub fn execute(&mut self) {
-        self.cycle().unwrap();
+        self.cycle();
         while self.pending_cycles != 0 {
-            self.cycle().unwrap();
+            self.cycle();
         }
     }
 
@@ -166,7 +164,7 @@ impl Cpu {
     //         }
     //     }
     // }
-    pub fn cycle(&mut self) -> Result<(), GeorgeError> {
+    pub fn cycle(&mut self) {
         sleep(Duration::from_nanos(100));
         if self.pending_cycles == 0 {
             if self.nmi || (self.irq && !self.get_flag(StatusFlag::IrqDisable)) {
@@ -178,10 +176,11 @@ impl Cpu {
                     match self.read_word(0xFFFA) {
                         Ok(word) => self.pc = word,
                         Err(error) => {
-                            return Err(GeorgeError {
+                            let george_error = GeorgeError {
                                 kind: GeorgeErrorKind::Memory(error),
                                 desc: String::from_str("Couldn't read NMI vector").unwrap(),
-                            })
+                            };
+                            println!("{:?}", george_error.desc);
                         }
                     };
                     self.pending_cycles = 8;
@@ -189,10 +188,11 @@ impl Cpu {
                     match self.read_word(0xFFFE) {
                         Ok(word) => self.pc = word,
                         Err(error) => {
-                            return Err(GeorgeError {
+                            let george_error = GeorgeError {
                                 kind: GeorgeErrorKind::Memory(error),
                                 desc: String::from_str("Couldn't read IRQ vector").unwrap(),
-                            })
+                            };
+                            println!("{:?}", george_error.desc);
                         }
                     };
                     self.pending_cycles = 7
@@ -204,62 +204,73 @@ impl Cpu {
             let opcode = match self.read(self.pc) {
                 Ok(byte) => byte,
                 Err(error) => {
-                    return Err(GeorgeError {
+                    let george_error = GeorgeError {
-                        desc: String::from_str("Failed to read the program counter!").unwrap(),
+                        desc: format!("Failed to read from memory at address {:#06x}!", self.pc),
                         kind: GeorgeErrorKind::Memory(error),
-                    })
+                    };
+                    println!("{:?}", george_error.desc);
+                    return;
                 }
             };
             let instruction = get_instruction(opcode);
             match instruction {
                 Instruction::Valid(valid_instruction) => {
-                    println!("a: {a:#04x}, x: {x:#04x}, y: {y:#04x}, pc: {pc:#06x}, sp: {s:#04x}, sr: {p:#010b}, irq: {irq:?}, nmi: {nmi:?}", a = self.a, x = self.x, y = self.y, pc = self.pc, s = self.s, p = self.p, irq = self.irq, nmi = self.nmi);
+                    //println!("a: {a:#04x}, x: {x:#04x}, y: {y:#04x}, pc: {pc:#06x}, sp: {s:#04x}, sr: {p:#010b}, irq: {irq:?}, nmi: {nmi:?}", a = self.a, x = self.x, y = self.y, pc = self.pc, s = self.s, p = self.p, irq = self.irq, nmi = self.nmi);
-                    println!(
+                    //println!(
-                        "Instruction: {:?}, {:#04x}",
+                    //    "Instruction: {:?}, {:#04x}",
-                        valid_instruction.opcode, opcode
+                    //    valid_instruction.opcode, opcode
-                    );
+                    //);
-                    println!("");
+                    //println!("");
                     self.pc += 1;
                     match valid_instruction.opcode.call(self) {
                         Ok(_) => {
                             self.pending_cycles += valid_instruction.cycles as usize;
-                        },
+                        }
-                        Err(error) => return Err(GeorgeError{
+                        Err(error) => {
+                            let george_error = GeorgeError{
                             desc: format!("An IncompatibleAddrMode was used at address {:#06x} for instruction {:?}", 
-                                          self.pc, valid_instruction).to_string(), kind: error})
+                                          self.pc, valid_instruction).to_string(), kind: error};
+                            println!("{:?}", george_error.desc);
+                        }
                     };
                 }
                 Instruction::Invalid(invalid_instruction) => match invalid_instruction.opcode {
                     0x02 => {
-                        let memory = match self.memory.try_read() {
+                        let memory = match self.memory.lock() {
                             Ok(read) => read,
                             Err(_) => {
                                 println!("Couldn't acquire read lock on memory in cpu thread");
-                                return Err(GeorgeError {
+                                let george_error = GeorgeError {
                                     kind: GeorgeErrorKind::Memory(MemoryError::Unwritable),
                                     desc: "Couldn't acquire read lock on memory in cpu thread"
                                         .to_string(),
-                                });
+                                };
+                                println!("{:?}", george_error.desc);
+                                return;
                             }
                         };
-                        memory.dump().unwrap();
+
+                        println!("a: {a:#04x}, x: {x:#04x}, y: {y:#04x}, pc: {pc:#06x}, sp: {s:#04x}, sr: {p:#010b}, irq: {irq:?}, nmi: {nmi:?}", a = self.a, x = self.x, y = self.y, pc = self.pc, s = self.s, p = self.p, irq = self.irq, nmi = self.nmi);
+                        memory
+                            .dump(PathBuf::from_str("./cpu_dump.bin").unwrap())
+                            .unwrap();
                         exit(1);
                     }
                     _ => {
-                        return Err(GeorgeError {
+                        let george_error = GeorgeError {
                             kind: GeorgeErrorKind::Execution(ExecutionError::InvalidInstruction),
                             desc: format!(
                         "An invalid instruction with opcode {:#04x} was called at address {:#06x}",
                         invalid_instruction.opcode, self.pc
                     ),
-                        });
+                        };
+                        println!("{:?}", george_error.desc);
                     }
                 },
             }
         }
         self.pending_cycles -= 1;
         self.cycle_count += 1;
-        Ok(())
     }
 
     pub fn stop(&mut self) {

src/george.asm

@@ -1,65 +1,27 @@
 .setcpu "65C02"
-.segment "CODE"
+.include "macro.inc"
 
 ; okay so rn i wanna set up a very basic system init, and write a few subroutines to draw characters at x,y coordinates
-    n = $01 ; temporary storage for data stack operations
+n = $01 ; temporary storage for data stack operations
 
-.macro breakpoint ; $02 isn't a valid instruction, the emulator will see this and halt, dump memory contents
+key_row = $200 ; used for character lookup when key pressed
-    .byte $02
+key_col = $201
-.endmacro 
+cursor = $202
 
-.macro pop ; drops a stack cell
+kb_row0 = $4400 ; keyboard hardware register, there are 5 more but i can just increment from here
-    inx
-    inx
-.endmacro
 
-.macro pop2 ; drops 2 data stack cells
+.segment "ROM"
-    inx
-    inx
-    inx
-    inx
-.endmacro
 
-.macro push ; 
+reset:
-    dex
-    dex
-.endmacro
-
-.macro push2 ; 
-    dex
-    dex
-    dex
-    dex
-.endmacro
-
-.macro to_r ; pop the top of the stack off and save it in the return (hardware) stack: (n -- )
-    lda 1, x
-    pha
-    lda 0, x
-    pha
-    pop
-.endmacro
-
-.macro from_r ; pop the top of the return stack off and put it on the data stack: ( -- n)
-    push
-    pla
-    sta 0, x
-    pla
-    sta 1, x
-.endmacro
-
-init:
     ldx #0; initialize data stack pointer
-    jsr initdisplay
+;lda #$80
-
+;sta $200
-main:
+;adc $200
-    jsr draw
+;breakpoint
 
 initdisplay:
     lda #$20
     ldy #0
-    jsr cleardisplay
-    rts
 
 cleardisplay:
     sta $6000,y
@@ -72,27 +34,104 @@ cleardisplay:
     sta $6700,y ; this goes slightly over but it's fine
     iny
     bne cleardisplay
+
+main:
+    ;jsr draw
+    jsr keyboard
+    jmp main
+
+keyboard:
+    ldy #0 ; loop through each row
+    @loop:
+        lda kb_row0, y
+        beq @skip ; if row has no key pressed, skip checking which key
+        jsr key_pressed
+        @skip:
+            iny
+            cpy #5
+            bne @loop
     rts
 
-draw: ; draw a character at (20, 30)
+key_pressed: ; a is loaded with the row byte
-    lda #63
+    sty key_row ; store character row
+    inc cursor
+    pha
+    phy
+    ldy #0
+    @find_col:            ; test each row bit, store column if key pressed
+        lsr                ; test bit 7
+        bcs store_col       ; if set, go store character column
+        iny
+        cpy #8
+        bne @find_col     ; loop until we've checked each bit
+
+store_col:
+    sty key_col
+
+keymap_index:
     push
-    sta 0, x ; low byte
+    lda key_col
-    stz 1,x ; high byte is zero
+    stz 1, x
-    lda #28
+    sta 0, x
     push
-    sta 0,x ; same here
+    lda #8
-    stz 1,x
+    stz 1, x
+    sta 0, x
+    push
+    lda key_row
+    stz 1, x
+    sta 0, x
+    jsr mult
+    jsr plus
+    lda 0, x
+    tay
+
+do_something_w_key: ; we've stored the character position, now let's 
+    lda keymap, y
+    ldy cursor
+    sta $6000, y
+    pla
+    ply
+    rts
+
+keymap:
+    .byte "?outrew?"
+    .byte "?piygsq?"
+    .byte "a??khvd?"
+    .byte "42ljbfz?"
+    .byte "31?mncx?"
+    .byte "?????ssm"
+
+draw:
+;    lda #%01000000
+;    bit $4400
+;    beq @1
+;    push_coords #0, #0
+;    push_char #$77
+;    jsr draw_char
+;    @1: 
+;    lda #%00100000
+;    bit $4400
+;    beq @2
+;    push_coords #0, #0
+;    push_char #$65
+;    jsr draw_char
+;    @2: 
+    rts
+
+draw_char: ; draw a character c at (x, y) (n1: x n2: y n3: c -- )
+    lda 0, x ; load a with character to draw
+    pop ; and pop it off the stack
     jsr get_char_address ; calculate where to put the character in memory
-    lda #4
     sta (0, x) ; store a at the address pointed to on the stack
-    brk
+    rts
 
 get_char_address:   ; gets vram address for a character at (x, y),
                     ; (n1: x n2: y -- n: $6000 + x + (64 * y))
     ;jsr push_lit ; push 64 onto stack, low byte first
     ;.byte 64
     ;.byte 0
+    pha
     lda #64
     push ; doing this instead until `push_lit` is fixed
     sta 0, x
@@ -109,18 +148,14 @@ get_char_address:   ; gets vram address for a character at (x, y),
     stz 0, x
     jsr plus ; add vram start address to result
 
+    pla
     rts
+
+fill: ; fills an area from (x1, y1) to (x2, y2) will character c, (n1: c n2: x1 n3: y1 n4: x2 n5: y2 -- )
     
-; inc16
+    jsr get_char_address
-; add 1 to a 16-bit pointer in zero page
-
-;inc16:
-;    inc ptr
-;    bne :+
-;    inc ptr+1
-;:   rts
-;
 
+; --- Data Stack --- ;
 ; on this channel we love garth wilson: https://wilsonminesco.com/stacks/StackOps.ASM
 ; data stack is built up of 2-byte cells
 
@@ -198,6 +233,8 @@ mult: ; multiply: (n1 n2 -- n1*n2), frankly, i don't know how this works, but TO
     pop
     ply
     rts
-        
 
-.segment "VRAM"
+
+.segment "VECTOR"
+.word reset
+

src/george.config

@@ -1,12 +1,10 @@
 MEMORY {
-        RAM: start = $0000, size = $0200, type = rw, fill = true;
+        RAM: start = $0000, size = $8000, type = ro, fill = yes;
-        PROGRAM: start = $0200, size = $3E00, type = rw, fill = true;
+        ROM: start = $8000, size = $7FFC, type = ro, fill = yes;
-        CTRL: start = $4000, size = $2000, type = rw, fill = true;
+        VECTOR: start = $FFFC, size = $4, type = ro, fill = yes;
-        VRAM: start = $6000, size = $8000, type = rw, fill = true;
-        ROM: start = $E000, size = $2000, type = ro, fill = true;
     }
 
 SEGMENTS {
-        CODE: load = "PROGRAM", type = rw;
+        ROM: load = "ROM", type = ro;
-        VRAM: load = "VRAM", type = rw;
+        VECTOR: load = "VECTOR", type = ro;
     }

src/georgeencoding.txt

@@ -7,10 +7,10 @@
 #		 column #2 is the Unicode (in hex as 0xXXXX)
 #		 column #3 the Unicode name (follows a comment sign, '#')
 
-0x00	0x0295	# ʕ
+0x00    0x00	# 
-0x01	0x00B7  # Middle Dot
+0x01	0x2591  # 
-0x02	0x1D25	# ᴥ
+0x02	0x2592  # ᴥ
-0x03	0x0294	# ʔ
+0x03	0x2593  # ʔ
 0x04	0x2661	# White heart 
 0x05    0x2665	# Black heart 
 0x06	0x2B50	# White star
@@ -189,70 +189,70 @@
 0xB3	0x258D	#	
 0xB4	0x258E	#	
 0xB5	0x258F	#	
-0xB6    0x2591	#	
+0xB6    0x0295  #	
-0xB7    0x2592	#	
+0xB7    0x00B7  #	
-0xB8    0x2593  #	
+0xB8    0x1D25  #	
-0xB9	0x2596  # 
+0xB9	0x0294
-0xBA	0x2597  # 
+0xBA	0x2596  
-0xBB	0x2598  #
+0xBB	0x2597  
-0xBC	0x2599  # 
+0xBC	0x2598  
-0xBD	0x259A  # 
+0xBD	0x2599  
-0xBE	0x259B  #
+0xBE	0x259A  
-0xBF	0x259C  # 
+0xBF	0x259B  
-0xC0	0x259D	#	
+0xC0	0x259C  
-0xC1	0x259E	#	
+0xC1	0x259D	
-0xC2	0x259F	#
+0xC2	0x259E	
-0xC3    0x2190	#	
+0xC3    0x259F	
-0xC4	0x2191	#   
+0xC4	0x2190	
-0xC5	0x2192	#   
+0xC5	0x2191	
-0xC6	0x2193	#	
+0xC6	0x2192	
-0xC7	0x2B60	#	
+0xC7	0x2193	
-0xC8	0x2B61	#	
+0xC8	0x2B60	
-0xC9	0x2B62	#	
+0xC9	0x2B61	
-0xCA	0x2B63	#   
+0xCA	0x2B62	
-0xCB	0x2B80  #
+0xCB	0x2B63	
-0xCC	0x2B81  #
+0xCC	0x2B80  
-0xCD	0x2B82  #
+0xCD	0x2B81  
-0xCE	0x2B83  #
+0xCE	0x2B82  
-0xCF	0xF049	#
+0xCF	0x2B83  
-0xD0	0xF04A	#
+0xD0	0xF049	
-0xD1	0x23F3	#
+0xD1	0xF04A	
-0xD2	0xF07B	#
+0xD2	0x23F3	
-0xD3	0xF07C	#
+0xD3	0xF07B	
-0xD4	0xF114	#
+0xD4	0xF07C	
-0xD5	0xF115	#
+0xD5	0xF114	
-0xD6	0xF250	#
+0xD6	0xF115	
-0xD7	0xF251	#
+0xD7	0xF250	
-0xD8	0xF253	#
+0xD8	0xF251	
-0xD9	0xF254	#
+0xD9	0xF253	
-0xDA	0xF461	#
+0xDA	0xF254	
-0xDB	0xF016	#
+0xDB	0xF461	
-0xDC	0xF401	#
+0xDC	0xF016	
-0xDD	0x1F52E	#
+0xDD	0xF401	
-0xDE	0xF2DB	#
+0xDE	0x1F52E	
-0xDF	0xF008	#
+0xDF	0xF2DB	
-0xE0	0x25C7	#
+0xE0	0xF008	
-0xE1	0x25C8	#
+0xE1	0x25C7	
-0xE2	0x1F311	#
+0xE2	0x25C8	
-0xE3	0x1F312	#
+0xE3	0x1F311	
-0xE4	0x1F313	#
+0xE4	0x1F312	
-0xE5	0x1F314	#
+0xE5	0x1F313	
-0xE6	0x1F315	#
+0xE6	0x1F314	
-0xE7	0x1F316	#
+0xE7	0x1F315	
-0xE8	0x1F317	#
+0xE8	0x1F316	
-0xE9	0x1F318	#
+0xE9	0x1F317	
-0xEA	0xF04C	#
+0xEA	0x1F318	
-0xEB	0x2714	#
+0xEB	0xF04C	
-0xEC	0x2718	#
+0xEC	0x2714	
-0xED	0x25C6	#
+0xED	0x2718	
-0xEE	0xF15D	#
+0xEE	0x25C6	
-0xEF	0xF15E	#
+0xEF	0xF15D	
-0xF0	0xF071	#
+0xF0	0xF15E	
-0xF1	0xF449	#
+0xF1	0xF071	
-0xF2	0xF529	#
+0xF2	0xF449	
-0xF3	0xF658	#
+0xF3	0xF529	
-0xF4	0xF659 	#
+0xF4	0xF658	
-0xF5	0x0020	#
+0xF5	0xF659 		#
 0xF6	0x1f381	#	Space
 0xF7	0xf05a	#	Space
 0xF8	0xf06a	#	Space

src/instructions.rs

@@ -2063,6 +2063,7 @@ impl Opcode {
                     let byte = cpu.read(address.try_into()?)?;
                     let carry = cpu.get_flag(StatusFlag::Carry);
                     let result = cpu.a as Word + byte as Word + carry as Word;
+                    println!("{result:#04x}");
                     cpu.set_flag(StatusFlag::Carry, result > Word::from(u8::max_value()));
                     cpu.set_flag(StatusFlag::Zero, result as Byte == 0);
                     cpu.set_flag(
@@ -2073,6 +2074,7 @@ impl Opcode {
                     );
                     cpu.set_flag(StatusFlag::Negative, cpu.is_negative(result as Byte));
                     cpu.a = result as Byte;
+                    println!("{:#04x}", cpu.a);
                     Ok(())
                 }
                 _ => Err(GeorgeErrorKind::AddrMode(
@@ -2103,10 +2105,7 @@ impl Opcode {
                 fn asl(cpu: &mut Cpu, value: Byte) -> Byte {
                     cpu.set_flag(StatusFlag::Carry, value & 0b1000_0000 == 0b1000_0000);
                     let shifted_value = value << 1;
-                    cpu.set_flag(
+                    cpu.set_flag(StatusFlag::Negative, cpu.is_negative(shifted_value));
-                        StatusFlag::Negative,
-                        value & StatusFlag::Negative as Byte > 0,
-                    );
                     cpu.set_flag(StatusFlag::Zero, shifted_value == 0);
                     shifted_value
                 }
@@ -2532,7 +2531,8 @@ impl Opcode {
             Opcode::BRK(mode) => match mode {
                 AddressingMode::Implied => {
                     cpu.set_flag(StatusFlag::Brk, true);
-                    panic!("Interrupts unimplemented!");
+                    Ok(())
+                    //panic!("Interrupts unimplemented!");
                 }
                 _ => Err(GeorgeErrorKind::AddrMode(
                     AddressingModeError::IncompatibleAddrMode,
@@ -2662,6 +2662,8 @@ impl Opcode {
             Opcode::DEX(mode) => match mode {
                 AddressingMode::Implied => {
                     cpu.x = cpu.x.wrapping_sub(1);
+                    cpu.set_flag(StatusFlag::Zero, cpu.x == 0);
+                    cpu.set_flag(StatusFlag::Negative, cpu.is_negative(cpu.x));
                     Ok(())
                 }
                 _ => Err(GeorgeErrorKind::AddrMode(
@@ -2670,7 +2672,9 @@ impl Opcode {
             },
             Opcode::DEY(mode) => match mode {
                 AddressingMode::Implied => {
-                    cpu.y -= 1;
+                    cpu.y = cpu.y.wrapping_sub(1);
+                    cpu.set_flag(StatusFlag::Zero, cpu.y == 0);
+                    cpu.set_flag(StatusFlag::Negative, cpu.is_negative(cpu.y));
                     Ok(())
                 }
                 _ => Err(GeorgeErrorKind::AddrMode(
@@ -2824,11 +2828,8 @@ impl Opcode {
                 fn lsr(cpu: &mut Cpu, value: Byte) -> Byte {
                     cpu.set_flag(StatusFlag::Carry, value & 1 == 1);
                     let shifted_value = value >> 1;
-                    cpu.set_flag(
-                        StatusFlag::Negative,
-                        value & StatusFlag::Negative as Byte > 0,
-                    );
                     cpu.set_flag(StatusFlag::Zero, shifted_value == 0);
+                    cpu.set_flag(StatusFlag::Negative, cpu.is_negative(value));
                     shifted_value
                 }
                 match mode {
@@ -3048,10 +3049,7 @@ impl Opcode {
                     let carry = cpu.get_flag(StatusFlag::Carry) as Byte;
                     cpu.set_flag(StatusFlag::Carry, value >> 7 == 1);
                     let shifted_value = (value << 1) + carry;
-                    cpu.set_flag(
+                    cpu.set_flag(StatusFlag::Negative, cpu.is_negative(shifted_value));
-                        StatusFlag::Negative,
-                        shifted_value & StatusFlag::Negative as Byte > 0,
-                    );
                     cpu.set_flag(StatusFlag::Zero, shifted_value == 0);
                     shifted_value
                 }
@@ -3080,10 +3078,7 @@ impl Opcode {
                     let carry = cpu.get_flag(StatusFlag::Carry) as Byte;
                     cpu.set_flag(StatusFlag::Carry, value & 1 == 1);
                     let shifted_value = (value >> 1) + (carry << 7);
-                    cpu.set_flag(
+                    cpu.set_flag(StatusFlag::Negative, cpu.is_negative(shifted_value));
-                        StatusFlag::Negative,
-                        shifted_value & StatusFlag::Negative as Byte > 0,
-                    );
                     cpu.set_flag(StatusFlag::Zero, shifted_value == 0);
                     shifted_value
                 }

src/main.rs

@@ -3,35 +3,23 @@
 mod cpu;
 mod error;
 mod instructions;
+mod keyboard;
 mod memory;
 mod types;
 mod video;
 
 use crate::cpu::Cpu;
-use crate::memory::{Mem, MemMappedDevice};
+use crate::memory::Mem;
 use crate::video::Crtc;
 
-use std::{
+use std::str::FromStr;
-    path::PathBuf,
+use std::sync::Mutex;
-    sync::{Arc, RwLock},
+use std::thread::sleep;
-    thread,
+use std::time::Duration;
-};
+use std::{path::PathBuf, sync::Arc, thread};
 
 fn main() {
-    let ram = MemMappedDevice::new(0x0000, 0x3FFF, 2, "ram".into());
+    let mut memory = Mem::new();
-    let control = MemMappedDevice::new(0x4000, 0x5FFF, 4, "control".into());
-    let vram = MemMappedDevice::new(0x6000, 0xDFFF, 1, "vram".into());
-    let rom = MemMappedDevice::new(0xE000, 0xFFFF, 4, "rom".into());
-    let mut memory = Mem::new(ram);
-    if let Err(error) = memory.add_area(control) {
-        println!("Error adding vram: {:?}", error.desc);
-    };
-    if let Err(error) = memory.add_area(vram) {
-        println!("Error adding vram: {:?}", error.desc);
-    };
-    if let Err(error) = memory.add_area(rom) {
-        println!("Error adding rom: {:?}", error.desc);
-    };
     let binary = match std::fs::File::open(PathBuf::from(
         "/Users/kline/projects/winter/george-emu/src/george",
     )) {
@@ -41,20 +29,20 @@ fn main() {
     if let Err(error) = memory.read_from_bin(binary) {
         println!("{:?}", error);
     };
-    memory.write(0xFFFC, 0x00).unwrap();
-    memory.write(0xFFFD, 0x02).unwrap();
 
-    let shared_memory = Arc::new(RwLock::new(memory));
+    memory
+        .dump(PathBuf::from_str("./coredump.bin").unwrap())
+        .unwrap();
+
+    let shared_memory = Arc::new(Mutex::new(memory));
     let cpu_memory = shared_memory.clone();
     let display_memory = shared_memory.clone();
 
-    let mut screen = Crtc::new(display_memory);
-
     thread::spawn(move || {
         let mut cpu = Cpu::new(cpu_memory);
         cpu.reset().unwrap();
         cpu.execute();
     });
+    let mut screen = Crtc::new(display_memory);
     screen.run();
-    shared_memory.write().unwrap().dump().unwrap();
 }

src/memory.rs

@@ -1,124 +1,44 @@
-use crate::error::{GeorgeError, GeorgeErrorKind, MappingError, MemoryError};
+use crate::error::MemoryError;
 use crate::types::{Byte, Word};
 use std::io::{self, Write};
 use std::path::PathBuf;
+use std::u16;
 use std::{fs::File, io::Read};
 
-#[derive(Debug, Clone)]
-pub struct MemMappedDevice {
-    start: Word,
-    end: Word,
-    pages: usize,
-    page: usize,
-    data: Vec<Byte>,
-    label: String,
-}
-
-impl MemMappedDevice {
-    pub fn new(start: Word, end: Word, pages: usize, label: String) -> Self {
-        Self {
-            start,
-            end,
-            pages,
-            page: 0,
-            data: vec![0x00; (end as usize + 1 - start as usize) * pages],
-            label,
-        }
-    }
-    fn contains(&self, address: Word) -> bool {
-        self.start <= address && self.end >= address
-    }
-    fn swap_page(&mut self, page: usize) -> Result<(), GeorgeError> {
-        match page > self.pages {
-            true => Err(GeorgeError {
-                kind: GeorgeErrorKind::Memory(MemoryError::Unmapped), //TODO: should be MappingError::InvalidPage,
-                desc: format!(
-                    "{:?} tried to swap to a page outside of its range",
-                    self.label
-                ),
-            }),
-            false => {
-                self.page = page;
-                Ok(())
-            }
-        }
-    }
-    fn size(&self) -> Word {
-        self.end - self.start + 1
-    }
-    fn translate_address(&self, address: Word) -> Word {
-        (address - self.start) + self.size() * (self.page as Word)
-    } // This needs to translate memory address from CPU land to local land, so
-      // for rom an address like 0xFFFF needs to be translated to Page X, 0xFFF
-}
-
 #[derive(Debug, Clone)]
 pub struct Mem {
-    areas: Vec<MemMappedDevice>,
+    pub data: Vec<Byte>,
 }
 
 impl Mem {
-    pub fn new(area: MemMappedDevice) -> Self {
+    pub fn new() -> Self {
-        Self { areas: vec![area] }
+        Self {
-    }
+            data: vec![0; u16::MAX as usize + 1],
-    pub fn dump(&self) -> io::Result<()> {
-        let mut outfile = File::create("./coredump.bin")?;
-        let mut data = Vec::new();
-        for area in &self.areas {
-            for byte in &area.data {
-                data.push(byte.to_owned());
-            }
         }
-        outfile.set_len(0xFFFF)?;
+    }
-        outfile.write_all(&data)?;
+    pub fn dump(&self, path: PathBuf) -> io::Result<()> {
+        let mut outfile = File::create(path)?;
+        outfile.write_all(&self.data)?;
         Ok(())
     }
-    pub fn add_area(&mut self, area: MemMappedDevice) -> Result<(), GeorgeError> {
-        for existing_area in &self.areas {
-            if existing_area.contains(area.end) || existing_area.contains(area.start) {
-                return Err(GeorgeError {
-                    desc: format!(
-                        "Tried to assign an area already allocated to {:?}",
-                        existing_area
-                    ),
-                    kind: GeorgeErrorKind::Mapping(MappingError::RegionOccupied),
-                });
-            }
-        }
-        self.areas.push(area);
-        Ok(())
-    }
-    pub fn read(&self, address: Word) -> Result<Byte, MemoryError> {
-        for area in &self.areas {
-            if area.contains(address) {
-                let translated_address = area.translate_address(address);
-                match area.data.get(translated_address as usize) {
-                    Some(data) => return Ok(*data),
-                    None => return Err(MemoryError::NoDataAtAddress),
-                }
-            }
-        }
-        Err(MemoryError::Unmapped)
-    }
 
-    pub fn write(&mut self, address: Word, data: Byte) -> Result<(), MemoryError> {
+    pub fn read(&self, address: Word) -> Byte {
-        for area in self.areas.iter_mut() {
+        self.data[address as usize]
-            if area.contains(address) {
+    }
-                // println!("Writing to area {label}", label = area.label);
+
-                let translated_address = area.translate_address(address);
+    pub fn write(&mut self, address: Word, data: Byte) {
-                area.data[translated_address as usize] = data;
+        self.data[address as usize] = data;
-                return Ok(());
-            };
-        }
-        Err(MemoryError::Unmapped)
     }
 
     pub fn read_from_bin(&mut self, f: File) -> Result<(), MemoryError> {
         let bytes = f.bytes();
         for (address, byte) in bytes.enumerate() {
             match byte {
-                Ok(value) => self.write(address as Word, value)?,
+                Ok(value) => self.write(address as Word, value),
-                Err(_) => return Err(MemoryError::Unwritable),
+                Err(_) => {
+                    println!("couldn't write byte {:#04x}", address);
+                    return Err(MemoryError::Unwritable);
+                }
             }
         }
         Ok(())

src/video.rs

@@ -3,7 +3,7 @@ use minifb::{Key, Scale, ScaleMode, Window, WindowOptions};
 use std::{
     fs::File,
     io::Read,
-    sync::{Arc, RwLock},
+    sync::{Arc, Mutex},
     thread::sleep,
     time::{Duration, Instant},
 };
@@ -12,7 +12,7 @@ const FG_COLOR: u32 = 0xFFCC00;
 const BG_COLOR: u32 = 0x110500;
 
 pub struct Crtc {
-    memory: Arc<RwLock<Mem>>,
+    memory: Arc<Mutex<Mem>>,
     buffer: Vec<u32>,
     window: minifb::Window,
     char_rom: Vec<u8>,
@@ -26,7 +26,7 @@ pub fn get_char_bin(path: &str) -> Vec<u8> {
 }
 
 impl Crtc {
-    pub fn new(memory: Arc<RwLock<Mem>>) -> Self {
+    pub fn new(memory: Arc<Mutex<Mem>>) -> Self {
         let window = Window::new(
             "ʕ·ᴥ·ʔ-☆",
             512,
@@ -52,82 +52,127 @@ impl Crtc {
         }
     }
     fn draw(&mut self) {
-        match &mut self.memory.clone().try_read() {
+        let memory = match self.memory.lock() {
-            Ok(memory) => {
+            Ok(memory) => memory,
-                let hw_ctrl = memory.read(0x4000).unwrap();
-                match hw_ctrl & 0b0000_1000 == 0b0000_1000 {
-                    false => self.draw_chars(),
-                    true => self.draw_hires(),
-                };
-            }
             Err(_) => {
-                println!("Couldn't acquire read on shared memory in main thread");
+                println!("Couldn't acquire read on shared memory in video thread");
                 return;
             }
         };
+        let hw_ctrl = memory.read(0x4000);
+        match hw_ctrl & 0b0000_1000 == 0b0000_1000 {
+            false => {
+                // the rest of this function is arcane wizardry based on the specifics of george's weird
+                // display and characters... don't fuck around w it
+                let mut i = 0;
+                for char_row in 0..29 {
+                    for char_col in 0..64 {
+                        let ascii = memory.read(0x6000 + i);
+                        i += 1;
+                        for row in 0..13 {
+                            let byte = self.char_rom[ascii as usize + (row * 0x101)];
+                            for i in (0..8).rev() {
+                                let buffer_index =
+                                    ((char_row) * 13 + (row)) * 512 + (char_col * 8 + i);
+                                if (byte << i) & 0x80 == 0x80 {
+                                    self.buffer[buffer_index] = FG_COLOR;
+                                } else {
+                                    self.buffer[buffer_index] = BG_COLOR;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+            true => {
+                for addr in 0x6000..0xBF00 {
+                    // TODO: eventually this will access memory in the weird interleaved way the hardware is
+                    // designed, but this is easiest to implement for now
+                    let byte = memory.read(addr);
+                    for i in 0..8 {
+                        match byte & 0x80 >> i == 0 {
+                            true => self.buffer[(addr - 0x6000) as usize * 8 + i] = BG_COLOR,
+                            false => self.buffer[(addr - 0x6000) as usize * 8 + i] = FG_COLOR,
+                        }
+                    }
+                }
+            }
+        };
 
         self.window
             .update_with_buffer(&self.buffer, 512, 380)
             .unwrap();
     }
 
-    fn draw_chars(&mut self) {
-        let memory = match self.memory.try_read() {
-            Ok(read) => read,
-            Err(_) => {
-                println!("Couldn't acquire read on shared memory in main thread");
-                return;
-            }
-        };
-
-        // the rest of this function is arcane wizardry based on the specifics of george's weird
-        // display and characters... don't fuck around w it
-        let mut i = 0;
-        for char_row in 0..29 {
-            for char_col in 0..64 {
-                let ascii = memory.read(0x6000 + i).unwrap();
-                i += 1;
-                for row in 0..13 {
-                    let byte = self.char_rom[ascii as usize + (row * 0x101)];
-                    for i in (0..8).rev() {
-                        let buffer_index = ((char_row) * 13 + (row)) * 512 + (char_col * 8 + i);
-                        if (byte << i) & 0x80 == 0x80 {
-                            self.buffer[buffer_index] = FG_COLOR;
-                        } else {
-                            self.buffer[buffer_index] = BG_COLOR;
-                        }
-                    }
-                }
-            }
-        }
-    }
-    fn draw_hires(&mut self) {
-        let memory = match self.memory.try_read() {
-            Ok(read) => read,
-            Err(_) => {
-                println!("Couldn't acquire read on shared memory in main thread");
-                return;
-            }
-        };
-        for addr in 0x6000..0xBF00 {
-            // TODO: eventually this will access memory in the weird interleaved way the hardware is
-            // designed, but this is easiest to implement for now
-            let byte = memory.read(addr).unwrap();
-            for i in 0..8 {
-                match byte & 0x80 >> i == 0 {
-                    true => self.buffer[(addr - 0x6000) as usize * 8 + i] = BG_COLOR,
-                    false => self.buffer[(addr - 0x6000) as usize * 8 + i] = FG_COLOR,
-                }
-            }
-        }
-    }
     pub fn run(&mut self) {
         let frame_duration = Duration::from_millis(16);
         let mut previous_draw = Instant::now();
 
         loop {
-            if self.window.is_key_down(Key::Q) {
+            let mut row0 = 0;
-                return;
+            let mut row1 = 0;
+            let mut row2 = 0;
+            let mut row3 = 0;
+            let mut row4 = 0;
+            let mut row5 = 0;
+
+            self.window.get_keys().iter().for_each(|key| match key {
+                Key::Escape => row0 ^= 0b1000_0000,
+                Key::W => row0 ^= 0b0100_0000,
+                Key::E => row0 ^= 0b0010_0000,
+                Key::R => row0 ^= 0b0001_0000,
+                Key::T => row0 ^= 0b0000_1000,
+                Key::U => row0 ^= 0b0000_0100,
+                Key::O => row0 ^= 0b0000_0010,
+                Key::Backspace => row0 ^= 0b0000_0001,
+                Key::Tab => row1 ^= 0b1000_0000,
+                Key::Q => row1 ^= 0b0100_0000,
+                Key::S => row1 ^= 0b0010_0000,
+                Key::G => row1 ^= 0b0001_0000,
+                Key::Y => row1 ^= 0b0000_1000,
+                Key::I => row1 ^= 0b0000_0100,
+                Key::P => row1 ^= 0b0000_0010,
+                Key::Enter => row1 ^= 0b0000_0001,
+                Key::LeftShift | Key::RightShift => row2 ^= 0b1000_0000,
+                Key::D => row2 ^= 0b0100_0000,
+                Key::V => row2 ^= 0b0010_0000,
+                Key::H => row2 ^= 0b0001_0000,
+                Key::K => row2 ^= 0b0000_1000,
+                Key::Apostrophe => row2 ^= 0b0000_0100,
+                Key::Slash => row2 ^= 0b0000_0010,
+                Key::A => row2 ^= 0b0000_0001,
+                Key::LeftCtrl | Key::RightCtrl => row3 ^= 0b1000_0000,
+                Key::Z => row3 ^= 0b0100_0000,
+                Key::F => row3 ^= 0b0010_0000,
+                Key::B => row3 ^= 0b0001_0000,
+                Key::J => row3 ^= 0b0000_1000,
+                Key::L => row3 ^= 0b0000_0100,
+                Key::Key2 => row3 ^= 0b0000_0010,
+                Key::Key4 => row3 ^= 0b0000_0001,
+                Key::LeftAlt | Key::RightAlt => row4 ^= 0b1000_0000,
+                Key::X => row4 ^= 0b0100_0000,
+                Key::C => row4 ^= 0b0010_0000,
+                Key::N => row4 ^= 0b0001_0000,
+                Key::M => row4 ^= 0b0000_1000,
+                Key::Comma => row4 ^= 0b0000_0100,
+                Key::Key1 => row4 ^= 0b0000_0010,
+                Key::Key3 => row4 ^= 0b0000_0001,
+                Key::LeftSuper => row5 ^= 0b1000_0000,
+                Key::Space => row5 ^= 0b0100_0000,
+                Key::RightSuper => row5 ^= 0b0010_0000,
+                _ => {}
+            });
+
+            match &mut self.memory.lock() {
+                Ok(memory) => {
+                    memory.write(0x4400, row0);
+                    memory.write(0x4401, row1);
+                    memory.write(0x4402, row2);
+                    memory.write(0x4403, row3);
+                    memory.write(0x4404, row4);
+                    memory.write(0x4405, row5);
+                }
+                Err(error) => println!("{error}"),
             }
             let now = Instant::now();
             if now - previous_draw > frame_duration {