98 lines
3.0 KiB
JavaScript
98 lines
3.0 KiB
JavaScript
/* Copyright 2010-2019 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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export default function Apple1IO(text) {
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var _key = 0;
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var _keyReady = false;
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var _displayReady = false;
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var _nextDSP = 0;
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var _buffer = [];
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var 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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};
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return {
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start: function() { return 0xd0; },
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end: function() { return 0xd0; },
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read: function(page, off) {
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var 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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// Keyboard
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if (_buffer.length) {
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result = _buffer.shift().toUpperCase().charCodeAt(0) & 0x7f;
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_keyReady = (_buffer.length > 0);
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} else {
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result = _key;
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_keyReady = false;
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}
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result |= 0x80;
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break;
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case LOC.KBDRDY:
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result = _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() > _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: function(page, off, val) {
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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 (_displayReady) {
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text.write(val);
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}
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_nextDSP = Date.now() + ((_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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_displayReady = true;
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break;
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}
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},
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reset: function apple1io_reset() {
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text.clear();
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_buffer = [];
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_keyReady = false;
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_displayReady = false;
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},
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keyUp: function apple1io_keyUp() {
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},
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keyDown: function apple1io_keyDown(key) {
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_key = key;
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_keyReady = true;
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},
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paste: function apple1io_paste(buffer) {
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buffer = buffer.replace(/\/\/.*\n/g, '');
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buffer = buffer.replace(/\n/g, '\r');
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_buffer = buffer.split('');
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_keyReady = true;
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}
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};
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}
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