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Implement CCF (Clear Carry Flag) and CHP (Carry Hop)

This commit is contained in:
n loewen 2023-07-25 19:00:34 +01:00
parent 890bb16145
commit d1a84748fc
1 changed files with 44 additions and 15 deletions
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59
simulator-sketch.js
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@ -103,9 +103,20 @@ function CPU(mem) {
this.instructionPointer = this.memory[addr];
},
// TODO: UNIMPLEMENTED
carry_toggle: () => { return; },
carry_hop: () => { return; },
carry_clear: () => {
console.log("CFC");
this.carryFlag = 0;
this.instructionPointer += 1;
},
carry_hop: () => {
console.log("CHP");
if (this.carryFlag != 0) {
this.instructionPointer += 2;
} else {
this.instructionPointer += 1;
}
},
};
this.perform_operation = (opcode, arg) => {
@ -162,6 +173,14 @@ function CPU(mem) {
this.instructions.jump_addr(arg);
break;
case 13:
this.instructions.carry_clear(arg);
break;
case 14:
this.instructions.carry_hop(arg);
break;
default:
console.error( `Invalid opcode: ${opcode} with argument ${arg}` );
}
@ -205,7 +224,7 @@ function CPU(mem) {
};
// TEST
// TESTS
let halt_and_catch_fire = [
[0, 0],
@ -219,8 +238,6 @@ let test_lda_sto = [
[2, 6], // STO addr
[0, 0], // END
];
// let comp = new CPU(test_lda_sto);
// comp.run_program();
let test_add_sub_nocarry = [
[5, 6], // ADD lit ... acc = 6
@ -234,8 +251,6 @@ let test_add_sub = [
[5, 26], // ADD lit
[0, 0], // END
]
// let comp = new CPU(test_add_sub);
//comp.run_program();
let test_hop = [
[5, 8], // ADD lit ... acc = 8
@ -244,10 +259,6 @@ let test_hop = [
[7, 8], // SUB lit ... acc = 0
[0, 0]
]
//let comp = new CPU(test_hop);
//comp.run_program();
// TODO: TEST HOP_addr
let test_jmp = [
[11, 4], // 0
@ -257,6 +268,24 @@ let test_jmp = [
[5, 8], // 4 ... ADD lit ... acc = 8
[0, 0], // 5 ... END
]
let comp = new CPU(test_jmp);
comp.run_program();
console.table(comp.memory);
let test_chp = [
[5, 8], // ADD lit ... acc = 8
[14, 0], // CHP ... shouldn't hop (CF = 0)
[5, 1], // ADD lit ... acc = 9
[5, 8], // ADD lit ... acc = 1 and CF = 1
[14, 0], // CHP ... hop! (CF = 1)
[0, 0], // END
[7, 1], // SUB lit ... acc = 0
[13, 0], // CFC ... CF = 0
[0, 0], // END
]
//let comp = new CPU(test_chp);
let comp = new CPU(test_lda_sto);
let memory_snapshots = comp.run_program();
log_table_with_title(memory_snapshots.memoryAtEnd, 'Memory after running');
log_table_with_title(memory_snapshots.memoryAtStart, 'Memory before running');
// TODO: TEST HOP_addr