diff --git a/65c02.ts b/65c02.ts
index 7fa0516..4d4cc83 100644
--- a/65c02.ts
+++ b/65c02.ts
@@ -191,18 +191,18 @@ export default class The65c02 {
/** push stuff onto stack */
push(val: number) {
if (this.stackPointer.num() == 0)
- console.error('stack overflow (no, not like the website)');
- this.stackPointer.increment();
- this.io.address.set(0x01FF - this.stackPointer.num());
+ console.error(`stack overflow (no, not like the website)`);
+ this.stackPointer.decrement();
+ this.io.address.set(0x0100 | this.stackPointer.num());
this.io.data.set(val);
this.write();
}
pop(): number {
if (this.stackPointer.num() == 0xFF)
console.error('stack underflow');
- this.io.address.set(0x01FF - this.stackPointer.num());
+ this.io.address.set(0x0100 | this.stackPointer.num());
this.read()
- this.stackPointer.decrement();
+ this.stackPointer.increment();
return this.io.data.num()
}
getZPAddr(): number {
diff --git a/eater.ts b/eater.ts
index 20af12a..683b23a 100644
--- a/eater.ts
+++ b/eater.ts
@@ -1,6 +1,7 @@
// deno-lint-ignore-file no-process-globals
import The65c02 from "./65c02.ts";
import matrix from "./opcode_matrix.json" with { type: "json" };
+import { type Buffer } from "node:buffer";
// eater.ts
// a runtime meant to mimic ben eater's 65c02 computer
@@ -30,6 +31,8 @@ const binStart = 0;
await cpu.loadInstructions()
+cpu.stackPointer.set(0xff)
+
const code = Deno.readFileSync('a.out')
// mem address $0000
@@ -52,13 +55,11 @@ cpu.io.reset.HI()
let running = true;
-process.stdin.on('data', (data) => {
+process.stdin.on('data', (data: Buffer) => {
if (data[0] == 3)
return running = false;
- // console.log(`uh`, data[0], data[0].toString(16))
ram[0x5000] = data[0];
ram[0x5001] = 0x08;
- // cpu.io.interruptRequest.HI();
})
// repeat until the cpu requests an interrupt
@@ -81,6 +82,9 @@ const clock = setInterval(() => {
throw 'oh no';
}
const instr = goog;
+ console.log(`\
+ PC AC XR YR SP NV-BDIZC
+6502: ${cpu.programCounter.num().toString(16).padStart(4, '0')} ${cpu.regA.num().toString(16).padStart(2, '0')} ${cpu.regX.num().toString(16).padStart(2, '0')} ${cpu.regY.num().toString(16).padStart(2, '0')} ${cpu.stackPointer.num().toString(16).padStart(2, '0')} ${cpu.stackPointer.num().toString(2).padStart(8, '0')}`)
console.debug(cpu.programCounter.num().toString(16).padStart(4, '0'),instr.mnemonic, instr.mode)
cpu.cycle();
// 1MHz i think
diff --git a/runtime.ts b/runtime.ts
index a7bf146..5bfafef 100644
--- a/runtime.ts
+++ b/runtime.ts
@@ -2,7 +2,9 @@ import The65c02, { BitField, Pin } from "./65c02.ts";
import matrix from "./opcode_matrix.json" with { type: "json" };
import { parseArgs } from "jsr:@std/cli/parse-args";
-const debug = Deno.args.includes('-d')
+const args = parseArgs(Deno.args)
+
+const debug = args.d
// the thing used for ram
const ram = new Uint8Array(2**16);
@@ -27,8 +29,6 @@ await cpu.loadInstructions()
// test
cpu.stackPointer.set(0xFF)
-const args = parseArgs(Deno.args)
-
const binStart = parseInt(args.b ?? args.binStart ?? '8000', 16)
const resVec = parseInt(args.s ?? args.start ?? binStart.toString(16), 16)
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