106 lines
2.6 KiB
TypeScript
106 lines
2.6 KiB
TypeScript
/* Copyright 2010-2023 Will Scullin <scullin@scullinsteel.com>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation. No representations are made about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*/
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import {TextPage} from './canvas1';
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import type {byte} from '@whscullin/cpu6502';
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const LOC = {
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KBD: 0x10,
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KBDRDY: 0x011,
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DSP: 0x12,
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DSPCTL: 0x13,
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} as const;
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export default class Apple1IO {
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_key = 0;
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_keyReady = false;
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_displayReady = false;
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_nextDSP = 0;
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_buffer: string[] = [];
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constructor(private text: TextPage) {}
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start() {
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return 0xd0;
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}
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end() {
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return 0xd0;
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}
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read(_page: byte, off: byte): byte {
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let result = 0;
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off &= 0x13;
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switch (off) {
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case LOC.KBD:
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{
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// Keyboard
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const key = this._buffer.shift();
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if (key != null) {
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result = key.toUpperCase().charCodeAt(0) & 0x7f;
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this._keyReady = this._buffer.length > 0;
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} else {
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result = this._key;
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this._keyReady = false;
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}
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result |= 0x80;
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}
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break;
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case LOC.KBDRDY:
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result = this._keyReady ? 0x80 : 0x00;
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break;
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case LOC.DSP:
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// Display
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// result = (Math.random() > 0.5) ? 0x80 : 0x00;
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result = Date.now() > this._nextDSP ? 0x00 : 0x80;
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break;
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case LOC.DSPCTL:
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break;
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}
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return result;
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}
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write(_page: byte, off: byte, val: byte): void {
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off &= 0x13;
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switch (off) {
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case LOC.KBD:
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break;
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case LOC.KBDRDY:
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break;
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case LOC.DSP:
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// Display
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if (this._displayReady) {
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this.text.write(val);
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}
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this._nextDSP = Date.now() + (this._buffer.length > 0 ? 0 : 17);
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break;
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case LOC.DSPCTL:
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// Don't pretend we care what the value was...
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this._displayReady = true;
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break;
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}
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}
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reset() {
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this._buffer = [];
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this._keyReady = false;
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this._displayReady = false;
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}
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keyUp() {}
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keyDown(key: byte) {
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this._key = key;
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this._keyReady = true;
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}
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paste(buffer: string) {
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buffer = buffer.replace(/\/\/.*\n/g, '');
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buffer = buffer.replace(/\n/g, '\r');
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this._buffer = buffer.split('');
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this._keyReady = true;
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}
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}
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