commit before ISA revamp

TODO

@@ -5,9 +5,10 @@ Move start/stop/auto logic into computer
 Speed control slider behavior
 Speed control slider styling
 
-Determine how to implement 16 bit integers in code (new instructions?)
-
 UI for screen (toggling (click an icon?))
 UI for togging other UI elements
 
-Instruction assign memory based on register
+UI for showing which Memory bank is selected
+VRAM select instruction
+
+Error log

src/computer.ts

@@ -1,7 +1,7 @@
 import { CpuEvent, CpuEventHandler, UiEvent, UiEventHandler } from "./events";
 import { byte_array_to_js_source, format_hex } from "./etc";
 import { Instruction, ISA } from "./instructionSet";
-import { m256, u1, u3, u8 } from "./num";
+import { m256, u1, u2, u3, u8 } from "./num";
 
 export type TempInstrState = {
 	pos: u8;
@@ -10,13 +10,21 @@ export type TempInstrState = {
 	params: Array<u8>;
 };
 
+function init_banks(): [Uint8Array, Uint8Array, Uint8Array, Uint8Array] {
+	const banks = [];
+	for (let i = 0; i < 4; i++) {
+		banks.push(new Uint8Array(256));
+	}
+	return banks as [Uint8Array, Uint8Array, Uint8Array, Uint8Array];
+}
+
 export class Computer {
-	private memory: Uint8Array = new Uint8Array(256);
-	private vram: Uint8Array = new Uint8Array(256);
+	private banks: [Uint8Array, Uint8Array, Uint8Array, Uint8Array] = init_banks();
 	private registers: Uint8Array = new Uint8Array(8);
 	private call_stack: Array<u8> = [];
+	private carry_flag: boolean = false;
 	private program_counter: u8 = 0;
-	private bank: u1 = 0;
+	private bank: u2 = 0;
 	private current_instr: TempInstrState | null = null;
 	events: CpuEventHandler = new CpuEventHandler();
 
@@ -94,34 +102,22 @@ export class Computer {
 		}
 		this.events.dispatch(CpuEvent.Cycle);
 	}
-	private getMemorySilent(address: u8, bank_override?: u1): u8 {
-		const banks = [this.memory, this.vram];
-
-		const bank = banks[bank_override ?? this.bank];
+	private getMemorySilent(address: u8, bank_override?: u2): u8 {
+		const bank = this.banks[bank_override ?? this.bank];
 		const value = bank[address] as u8;
 
 		return value;
 	}
 
-	getMemory(address: u8, bank_override?: u1): u8 {
+	getMemory(address: u8, bank_override?: u2): u8 {
 		const value = this.getMemorySilent(address, bank_override);
 		this.events.dispatch(CpuEvent.MemoryAccessed, { address, bank: this.bank, value });
+
 		return value;
 	}
 
 	setMemory(address: u8, value: u8): void {
-		let bank: Uint8Array | undefined;
-		if (this.bank === 0) {
-			bank = this.memory;
-		} else if (this.bank === 1) {
-			bank = this.vram;
-		} else {
-			const _: never = this.bank;
-		}
-		if (bank === undefined) {
-			throw new Error("unreachable");
-		}
-		bank[address] = value;
+		this.banks[this.bank][address] = value;
 		this.events.dispatch(CpuEvent.MemoryChanged, { address, bank: this.bank, value });
 	}
 
@@ -153,18 +149,28 @@ export class Computer {
 		return this.call_stack.pop() ?? null;
 	}
 
-	setBank(bank_no: u1): void {
+	setBank(bank_no: u2): void {
 		this.events.dispatch(CpuEvent.SwitchBank, { bank: bank_no });
 		this.bank = bank_no;
 	}
 
+	setCarry(state: boolean): void {
+		this.carry_flag = state;
+		this.events.dispatch(CpuEvent.SetFlagCarry, true);
+	}
+
+	getCarry(): boolean {
+		return this.carry_flag;
+	}
+
 	reset(): void {
 		this.events.dispatch(CpuEvent.Reset);
-		this.memory = new Uint8Array(256);
+		this.banks = init_banks();
 		this.registers = new Uint8Array(8);
 		this.call_stack = [];
 		this.current_instr = null;
 		this.program_counter = 0;
+		this.carry_flag = false;
 	}
 
 	init_events(ui: UiEventHandler): void {
@@ -175,20 +181,21 @@ export class Computer {
 	}
 
 	load_memory(program: Array<u8>): void {
+		// TODO allow loading into other banks
 		console.log(byte_array_to_js_source(program));
 		const max_loop: u8 = Math.min(255, program.length) as u8;
-		for (let i: u8 = 0; i < 255; i++) {
+		for (let i: u8 = 0; i < 256; i++) {
 			// Don't fire event if no change is made
-			if (this.memory[i] === program[i]) continue;
+			if (this.banks[0][i] === program[i]) continue;
 
-			this.memory[i] = program[i];
+			this.banks[0][i] = program[i];
 			this.events.dispatch(CpuEvent.MemoryChanged, { address: i as u8, bank: 0, value: program[i] });
 		}
 		this.program_counter = 0;
 	}
 
 	dump_memory(): Uint8Array {
-		return this.memory;
+		return this.banks[0];
 	}
 
 	private step_forward(): void {

src/etc.ts

@@ -42,3 +42,5 @@ export function el(type: string, id?: string): HTMLElement | undefined {
 }
 
 export type NonEmptyArray<T> = T[] & { 0: T };
+
+export const SVG_NS = "http://www.w3.org/2000/svg";

src/events.ts

@@ -5,7 +5,7 @@
  */
 import { EventHandler } from "./eventHandler";
 import { Instruction, ParameterType } from "./instructionSet";
-import { u1, u3, u8 } from "./num";
+import { u1, u2, u3, u8 } from "./num";
 
 //
 // CPU Event Handler Definition
@@ -26,6 +26,7 @@ export enum CpuEvent {
 	// ClockStopped,
 	MemoryAccessed,
 	SwitchBank,
+	SetFlagCarry,
 }
 
 type VoidDataCpuEventList = CpuEvent.Halt | CpuEvent.Reset | CpuEvent.Cycle;
@@ -33,16 +34,17 @@ type VoidDataCpuEventList = CpuEvent.Halt | CpuEvent.Reset | CpuEvent.Cycle;
 // | CpuEvent.ClockStopped;
 
 interface CpuEventMap {
-	[CpuEvent.MemoryChanged]: { address: u8; bank: u1; value: u8 };
-	[CpuEvent.MemoryAccessed]: { address: u8; bank: u1; value: u8 };
+	[CpuEvent.MemoryChanged]: { address: u8; bank: u2; value: u8 };
+	[CpuEvent.MemoryAccessed]: { address: u8; bank: u2; value: u8 };
 	[CpuEvent.RegisterChanged]: { register_no: u3; value: u8 };
 	[CpuEvent.ProgramCounterChanged]: { counter: u8 };
 	[CpuEvent.InstructionParsed]: { pos: u8; code: u8; instr: Instruction };
 	[CpuEvent.ParameterParsed]: { pos: u8; code: u8; param: ParameterType };
 	[CpuEvent.InvalidParsed]: { pos: u8; code: u8 };
 	[CpuEvent.InstructionExecuted]: { instr: Instruction };
-	[CpuEvent.SwitchBank]: { bank: u1 };
+	[CpuEvent.SwitchBank]: { bank: u2 };
 	[CpuEvent.Print]: string;
+	[CpuEvent.SetFlagCarry]: boolean;
 }
 
 export interface CpuEventHandler extends EventHandler<CpuEvent> {

src/index.ts

@@ -17,6 +17,7 @@ declare global {
 	interface Window {
 		comp: Computer;
 		ui: UI;
+		firehose: () => void;
 	}
 }
 
@@ -78,7 +79,6 @@ function main(): void {
 	ui.init_events(computer.events);
 	computer.load_memory(program);
 	computer.init_events(ui.events);
-
 	window.comp = computer;
 	window.ui = ui;
 
@@ -112,10 +112,17 @@ function main(): void {
 		});
 		reader.readAsArrayBuffer(file);
 	});
-
-	// computer.events.firehose((ident, data) => {
-	// 	console.log(`New Event: ${CpuEvent[ident]}. data: `, data);
-	// });
+	let fire = false;
+	window.firehose = (): void => {
+		if (fire === false) {
+			computer.events.firehose((ident, data) => {
+				console.log(`New Event: ${CpuEvent[ident]}. data: `, data);
+			});
+			fire = true;
+		} else {
+			console.error("Firehose already started");
+		}
+	};
 
 	$("save_button").addEventListener("click", () => {
 		const memory = computer.dump_memory();
@@ -125,11 +132,15 @@ function main(): void {
 		const link = document.createElement("a");
 		link.href = url;
 		link.download = "bin.bin";
-		link.style.display = "none";
 		link.click();
 	});
 }
 
 document.addEventListener("DOMContentLoaded", () => {
-	main();
+	// at least you know it's bad
+	try {
+		main();
+	} catch (e) {
+		alert(e);
+	}
 });

src/instructionSet.ts

@@ -5,7 +5,7 @@
  */
 import { CpuEvent, CpuEventHandler } from "./events";
 import { format_hex } from "./etc";
-import { isU3, m256, u1, u3, u8 } from "./num";
+import { isU2, isU3, m256, u2, u3, u8 } from "./num";
 
 export enum ParamType {
 	Const,
@@ -47,7 +47,9 @@ interface GenericComputer {
 	setRegister: (number: u3, value: u8) => void;
 	pushCallStack: (address: u8) => boolean;
 	popCallStack: () => u8 | null;
-	setBank: (bank_no: u1) => void;
+	setBank: (bank_no: u2) => void;
+	getCarry(): boolean;
+	setCarry(state: boolean): void;
 }
 
 interface AfterExecutionComputerAction {
@@ -112,7 +114,7 @@ ISA.insertInstruction(0x10, {
 ISA.insertInstruction(0x20, {
 	name: "LoadToRegister",
 	desc: "Sets the byte in register (P1) to be the contents of memory cell at address in register (P2)",
-	params: [new RegisParam("Set this register to"), new RegisParam("the byte held in this memory address")],
+	params: [new RegisParam("Set this register to"), new RegisParam("the byte in the memory addressed by this register")],
 	execute(c, p) {
 		const [register_no, register_2] = p;
 		if (!isU3(register_no)) throw new Error("TODO");
@@ -200,6 +202,21 @@ ISA.insertInstruction(0x40, {
 		c.setRegister(register_no_1, new_value);
 	},
 });
+ISA.insertInstruction(0x41, {
+	name: "Subtract",
+	desc: "Subtracts the contents of (P2) from (P1) and stores result to register (P1).",
+	params: [
+		new RegisParam("set this register to"),
+		new RegisParam("the difference between it in the value in this register"),
+	],
+	execute(c, p) {
+		const [register_no_1, register_no_2] = p;
+		if (!isU3(register_no_1)) throw new Error("TODO");
+		if (!isU3(register_no_2)) throw new Error("TODO");
+		const new_value = m256(c.getRegister(register_no_1) - c.getRegister(register_no_2));
+		c.setRegister(register_no_1, new_value);
+	},
+});
 
 ISA.insertInstruction(0x50, {
 	name: "Equals",
@@ -321,7 +338,7 @@ ISA.insertInstruction(0xb1, {
 	params: [new ConstParam("Bank number")],
 	execute(c, p) {
 		const bank_no = p[0];
-		if (!(bank_no === 1 || bank_no === 0)) {
+		if (!isU2(bank_no)) {
 			throw new Error("TODO");
 		}
 		c.setBank(bank_no);

src/num.ts

@@ -30,6 +30,13 @@ export type u4 = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14
 
 export const m256 = (number: number): u8 => (number % 256) as u8;
 
+export function isU2(n: number): n is u2 {
+	if (n < 4 && n >= 0) {
+		return true;
+	}
+	return false;
+}
+
 /**
  * Determines whether a number is a u3 type (unsigned 3-bit integer).
  * Does not check for non integers

src/style.scss

@@ -52,7 +52,7 @@ body {
 		"title .         .           . ."
 		"title .         .           . printout "
 		"title .         .           . printout "
-		".     buttons   buttons     buttons    buttons";
+		".     buttons   buttons     . .";
 	#memory {
 		grid-column: 2/4;
 		grid-row: 2/6;
@@ -198,6 +198,53 @@ label.button:hover {
 
 #controls_bar {
 	grid-area: buttons;
+
 	display: flex;
 	gap: 10px;
 }
+
+input[type="range"] {
+	background-color: transparent;
+	-webkit-appearance: none;
+	appearance: none;
+	margin: 18px 0;
+	// width: 100%;
+}
+input[type="range"]:focus {
+	outline: none;
+}
+// 2024 and we still have to do this
+input[type="range"]::-webkit-slider-runnable-track {
+	height: 0.5em;
+	cursor: pointer;
+	background: yellow;
+	border-radius: 0px;
+}
+input[type="range"]::-webkit-slider-thumb {
+	border: 4px solid yellow;
+	background-color: black;
+	height: 42px;
+	width: 20px;
+	border-radius: 0px;
+	cursor: pointer;
+	margin-top: -18px;
+	-webkit-appearance: none;
+}
+
+input[type="range"]:focus::-webkit-slider-runnable-track {
+	background: yellow;
+}
+input[type="range"]::-moz-range-track {
+	height: 0.5em;
+	cursor: pointer;
+	background: yellow;
+	border-radius: 0px;
+}
+input[type="range"]::-moz-range-thumb {
+	border: 4px solid yellow;
+	background-color: black;
+	height: 36px;
+	width: 16px;
+	border-radius: 0px;
+	cursor: pointer;
+}

src/ui/bankIndicator.ts

@@ -0,0 +1,22 @@
+import { UiEventHandler, CpuEventHandler, CpuEvent } from "../events";
+import { u1, u2 } from "../num";
+import { UiComponent } from "./uiComponent";
+
+class BankIndicator implements UiComponent {
+	element: HTMLElement;
+	events: UiEventHandler;
+	constructor(element: HTMLElement, events: UiEventHandler) {
+		this.element = element;
+		this.events = events;
+	}
+
+	reset(): void {}
+
+	select_bank(bank_no: u2): void {}
+
+	init_cpu_events(c: CpuEventHandler): void {
+		c.listen(CpuEvent.SwitchBank, ({ bank }) => {
+			this.select_bank(bank);
+		});
+	}
+}

src/ui/memoryView.ts

@@ -31,7 +31,8 @@ export class MemoryView extends CelledViewer implements UiComponent {
 	}
 
 	init_cpu_events(c: CpuEventHandler): void {
-		c.listen(CpuEvent.MemoryAccessed, ({ address, value }) => {
+		c.listen(CpuEvent.MemoryAccessed, ({ address, bank, value }) => {
+			if (bank !== 0) return;
 			if (this.last_accessed_cell !== address) {
 				if (this.last_accessed_cell !== null) {
 					this.remove_cell_class(this.last_accessed_cell, "last_access");

src/ui/screen.ts

@@ -43,12 +43,6 @@ export class Screen implements UiComponent {
 
 	setPixel(x: u4, y: u4, value: u8): void {
 		const point: [number, number] = [x * this.scale[0], y * this.scale[1]];
-		// const RED_SCALE = 255 / 2 ** 2;
-		// const GREEN_SCALE = 255 / 2 ** 2;
-		// const BLUE_SCALE = 255 / 2 ** 2;
-		// const red = ((value >> 4) & 0b11) * RED_SCALE;
-		// const green = ((value >> 2) & 0b11) * GREEN_SCALE;
-		// const blue = (value & 0b11) * BLUE_SCALE;
 
 		const RED_SCALE = 255 / 2 ** 3;
 		const GREEN_SCALE = 255 / 2 ** 3;
@@ -58,7 +52,6 @@ export class Screen implements UiComponent {
 		const blue = (value & 0b11) * BLUE_SCALE;
 
 		const color = `rgb(${red},${green},${blue})`;
-		console.log(x, y, value, color);
 		this.ctx.fillStyle = color;
 		this.ctx.fillRect(...point, ...this.scale);
 	}