asm fiddling and better debug info

george.toml

@@ -1,3 +1,3 @@
 char_rom = "./src/roms/cozette.rom"
 rom = "./src/roms/george.rom"
-
+screen = "Window"

src/cpu.rs

@@ -1,13 +1,11 @@
-use crate::instructions::{get_instruction, Instruction};
+use crate::instructions::get_instruction;
 use crate::memory::{MemHandle, MemoryReader, MemoryWriter};
 use std::fmt::Display;
-use std::io::{self, Write};
-use std::process::exit;
 use std::sync::mpsc::{channel, Receiver, Sender};
 use std::thread::sleep;
 use std::time::Duration;
 
-use anyhow::Result;
+use termion::cursor::Goto;
 
 #[derive(Clone, Copy)]
 pub enum StatusFlag {
@@ -238,7 +236,7 @@ impl Cpu {
         self.receive_control();
 
         if self.stopped & !self.cycle {
-            // self.set_flag(StatusFlag::IrqDisable, true);
+            self.set_flag(StatusFlag::IrqDisable, true);
             return;
         }
         self.cycle = false;
@@ -264,4 +262,35 @@ impl Cpu {
     pub fn stop(&mut self) {
         self.stopped = true;
     }
+    pub fn breakpoint(&mut self) {
+        // 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!(
+        //     "Instruction: {:?}, {:#04x}",
+        //     valid_instruction.opcode, opcode
+        // );
+        // println!("");
+        // println!(
+        //     "{}{:#04x}: {:#02x}, {:#04x}: {:#02x}",
+        //     Goto(1, 35),
+        //     0x20,
+        //     self.read(0x20),
+        //     0x21,
+        //     self.read(0x21)
+        // );
+        // println!(
+        //     "{}str_ptr {:#04x}: {:#02x}, {:#04x}: {:#02x}",
+        //     Goto(1, 36),
+        //     0x30,
+        //     self.read(0x30),
+        //     0x31,
+        //     self.read(0x31)
+        // );
+        // println!(
+        //     "{}cursor - x: {:#02x}, y: {:#02x}",
+        //     Goto(1, 37),
+        //     self.read(0x300),
+        //     self.read(0x301)
+        // );
+        self.stop();
+    }
 }

src/keyboard.rs

@@ -178,7 +178,7 @@ impl Keyboard {
 impl MemoryWriter for Keyboard {
     fn write(&self, address: u16, data: u8) {
         if data != 0x00 {
-            println!("wrote {:02x} to address {:04x}", data, address);
+            // println!("wrote {:02x} to address {:04x}", data, address);
         }
         self.memory.write(address, data);
     }

src/main.rs

@@ -15,15 +15,14 @@ use crate::video::Screen;
 use cli::get_input;
 use crossterm::cursor;
 use memory::MemHandle;
-use std::io::{stdout, Read, Result, Write};
+use std::io::stdout;
 use std::thread::{self, sleep};
 use std::time::Duration;
 use termion::cursor::Goto;
 use termion::event::Key;
 use termion::input::TermRead;
 use termion::raw::IntoRawMode;
-use termion::screen::IntoAlternateScreen;
-use termion::{async_stdin, clear, screen};
+use termion::{async_stdin, clear};
 
 fn main() {
     let _stdout = stdout().into_raw_mode();

src/roms/george.asm

@@ -20,7 +20,7 @@ reset:
     ldx #0; initialize data stack pointer
 
 initdisplay:
-    lda #$20
+    lda #0
     ldy #0
 
 cleardisplay:
@@ -36,6 +36,13 @@ cleardisplay:
     bne cleardisplay
     cli
 
+print_test:
+    lda #0
+    sta key_row
+    lda #5
+    sta key_col
+    push_coords #5, #5
+
 main:
     ; jsr printtext
     ; key_zero:
@@ -45,74 +52,82 @@ main:
     ; fim: 
     ;     cli
     ;     bra fim
-    jsr keyboard
+    jsr print
+    ; jsr print
     jmp main
 
 
-keyboard:
-    ldy #0 
-    .check_row: ; loop through each row
-        lda kb_row, y
-        beq .skip_row ; if row has no key pressed, skip checking which key
-        ; jmp key_down
-        sta kb_row_cache, y ; if key pressed, cache it
-        lda kb_row, y
-        cmp kb_row_cache, y ; has key changed?
-        beq key_down
-        .skip_row:
-            iny
-            cpy #5
-            bne .check_row
-    rts
+; keyboard: ; reads keyboard registers and stores the column and row of the first key found
+;     ; TODO: make this routine store up to 8 indices (for 8 key rollover)
+;     ldy #0 
+;     .check_row: ; loop through each row
+;         lda kb_row, y
+;         beq .skip_row ; if row has no key pressed, skip checking which key
+;         ; jmp key_down
+;         sta kb_row_cache, y ; if key pressed, cache it
+;         lda kb_row, y
+;         cmp kb_row_cache, y ; has key changed?
+;         beq key_down
+;         .skip_row:
+;             iny
+;             cpy #5
+;             bne .check_row
+;     rts
 
-key_down:               ; a is loaded with the row byte
-    phy
-    sty key_row         ; store character row
-    ldy #0
-    .find_col:          ; test each row bit, store column if key pressed
-        lsr             ; test bit 7
-        bcs store_col       ; if unset, don't go store character columnb
-        .skip:
-            iny
-            cpy #8
-            bne .find_col   ; loop until we've checked each bit
+;     key_down:               ; a is loaded with the row byte
+;         phy
+;         sty key_row         ; store character row
+;         ldy #0
+;         .find_col:          ; test each row bit, store column if key pressed
+;             lsr             ; test bit 7
+;             bcs store_col       ; if unset, don't go store character columnb
+;             .skip:
+;                 iny
+;                 cpy #8
+;                 bne .find_col   ; loop until we've checked each bit
+;             rts
 
-store_col:
-    sty key_col
+;     store_col:
+;         sty key_col
+;         jsr print
+;         rts
 
-keymap_index:
-    push
-    lda key_col
-    stz 1, x
-    sta 0, x
-    push
-    lda #8
-    stz 1, x
-    sta 0, x
-    push
-    lda key_row
-    stz 1, x
-    sta 0, x
-    jsr mult
-    jsr plus
-    lda 0, x
-    tay
 
-print: ; we've stored the character position, now let's 
+
+
+print: ; x y -- prints the key indexed with key_col and key_row at position x, y
+
+    keymap_index:
+        push
+        lda key_col
+        stz 1, x
+        sta 0, x
+        push
+        lda #8
+        stz 1, x
+        sta 0, x
+        push
+        lda key_row
+        stz 1, x
+        sta 0, x
+        jsr mult
+        jsr plus
+        lda 0, x
+        tay
     lda keymap, y
-    ldy cursor
-    sta $6000, y
-    inc cursor
-    ply
+    push
+    sta 0, x
+    stz 1, x
+    jsr draw_char
     rts
 
-keymap:
-    .byte "?outrew?"
-    .byte "?piygsq?"
-    .byte "a??khvd?"
-    .byte "42ljbfz?"
-    .byte "31?mncx?"
-    .byte "?????  m"
+    keymap:
+        .byte "?outrew?"
+        .byte "?piygsq?"
+        .byte "a??khvd?"
+        .byte "42ljbfz?"
+        .byte "31?mncx?"
+        .byte "?????  m"
 
 draw:
     ; push_coords #0, #0

src/roms/macro.inc

@@ -1,7 +1,7 @@
     .macro breakpoint ; $02 isn't a valid instruction, the emulator will see this and halt, dump memory contents
         .byte $02
     .endm
-    
+
     .macro pop ; drops a data stack cell
         inx
         inx

src/roms/template.asm

@@ -27,7 +27,7 @@ cleardisplay:
     cli
 
 main:
-    jmp draw
+    jsr draw
     jmp main
 
 draw: