mirror of
https://github.com/whscullin/apple2js.git
synced 2024-01-12 14:14:38 +00:00
470 lines
13 KiB
JavaScript
470 lines
13 KiB
JavaScript
/* Copyright 2010-2019 Will Scullin <scullin@scullinsteel.com>
|
|
*
|
|
* Permission to use, copy, modify, distribute, and sell this software and its
|
|
* documentation for any purpose is hereby granted without fee, provided that
|
|
* the above copyright notice appear in all copies and that both that
|
|
* copyright notice and this permission notice appear in supporting
|
|
* documentation. No representations are made about the suitability of this
|
|
* software for any purpose. It is provided "as is" without express or
|
|
* implied warranty.
|
|
*/
|
|
|
|
import { debug } from './util';
|
|
|
|
export default function Apple2IO(cpu, vm)
|
|
{
|
|
var _slot = [];
|
|
var _auxRom = null;
|
|
|
|
var _khz = 1023;
|
|
var _rate = 44000;
|
|
var _sample_size = 4096;
|
|
|
|
var _cycles_per_sample;
|
|
|
|
var _buffer = [];
|
|
var _key = 0;
|
|
var _keyDown = false;
|
|
var _button = [false, false, false];
|
|
var _paddle = [0.0, 0.0, 0.0, 0,0];
|
|
var _phase = -1;
|
|
var _sample = [];
|
|
var _sampleIdx = 0;
|
|
var _sampleTime = 0;
|
|
var _didAudio = false;
|
|
|
|
var _high = 0.5;
|
|
var _low = -0.5;
|
|
|
|
var _audioListener = null;
|
|
|
|
var _trigger = 0;
|
|
var _annunciators = [false, false, false, false];
|
|
|
|
var _tape = [];
|
|
var _tapeOffset = 0;
|
|
var _tapeNext = 0;
|
|
var _tapeCurrent = false;
|
|
|
|
var LOC = {
|
|
KEYBOARD: 0x00, // keyboard data (latched) (Read),
|
|
STROBE: 0x10, // clear bit 7 of keyboard data ($C000)
|
|
TAPEOUT: 0x20, // toggle the cassette output.
|
|
SPEAKER: 0x30, // toggle speaker diaphragm
|
|
C040STB: 0x40, // trigger game port sync
|
|
CLRTEXT: 0x50, // display graphics
|
|
SETTEXT: 0x51, // display text
|
|
CLRMIXED: 0x52, // clear mixed mode- enable full graphics
|
|
SETMIXED: 0x53, // enable graphics/text mixed mode
|
|
PAGE1: 0x54, // select text/graphics page1
|
|
PAGE2: 0x55, // select text/graphics page2
|
|
CLRHIRES: 0x56, // select Lo-res
|
|
SETHIRES: 0x57, // select Hi-res
|
|
CLRAN0: 0x58, // Set annunciator-0 output to 0
|
|
SETAN0: 0x59, // Set annunciator-0 output to 1
|
|
CLRAN1: 0x5A, // Set annunciator-1 output to 0
|
|
SETAN1: 0x5B, // Set annunciator-1 output to 1
|
|
CLRAN2: 0x5C, // Set annunciator-2 output to 0
|
|
SETAN2: 0x5D, // Set annunciator-2 output to 1
|
|
CLRAN3: 0x5E, // Set annunciator-3 output to 0
|
|
SETAN3: 0x5F, // Set annunciator-3 output to 1
|
|
TAPEIN: 0x60, // bit 7: data from cassette
|
|
PB0: 0x61, // game Pushbutton 0 / open apple (command) key data
|
|
PB1: 0x62, // game Pushbutton 1 / closed apple (option) key data
|
|
PB2: 0x63, // game Pushbutton 2 (read)
|
|
PADDLE0: 0x64, // bit 7: status of pdl-0 timer (read)
|
|
PADDLE1: 0x65, // bit 7: status of pdl-1 timer (read)
|
|
PADDLE2: 0x66, // bit 7: status of pdl-2 timer (read)
|
|
PADDLE3: 0x67, // bit 7: status of pdl-3 timer (read)
|
|
PDLTRIG: 0x70, // trigger paddles
|
|
ACCEL: 0x74, // CPU Speed control
|
|
};
|
|
|
|
function init() {
|
|
_calcSampleRate();
|
|
}
|
|
|
|
function _debug() {
|
|
// debug.apply(this, arguments);
|
|
}
|
|
|
|
function _tick() {
|
|
var now = cpu.cycles();
|
|
var phase = _didAudio ? (_phase > 0 ? _high : _low) : 0.0;
|
|
for (; _sampleTime < now; _sampleTime += _cycles_per_sample) {
|
|
_sample[_sampleIdx++] = phase;
|
|
if (_sampleIdx === _sample_size) {
|
|
if (_audioListener) {
|
|
_audioListener(_sample);
|
|
}
|
|
_sample = new Array(_sample_size);
|
|
_sampleIdx = 0;
|
|
}
|
|
}
|
|
_didAudio = false;
|
|
}
|
|
|
|
function _calcSampleRate() {
|
|
_cycles_per_sample = _khz * 1000 / _rate;
|
|
}
|
|
|
|
function _updateKHz(khz) {
|
|
_khz = khz;
|
|
_calcSampleRate();
|
|
}
|
|
|
|
init();
|
|
|
|
function _access(off, val) {
|
|
var result = 0;
|
|
var now = cpu.cycles();
|
|
var delta = now - _trigger;
|
|
switch (off) {
|
|
case LOC.CLRTEXT:
|
|
_debug('Graphics Mode');
|
|
vm.text(false);
|
|
break;
|
|
case LOC.SETTEXT:
|
|
_debug('Text Mode');
|
|
vm.text(true);
|
|
break;
|
|
case LOC.CLRMIXED:
|
|
_debug('Mixed Mode off');
|
|
vm.mixed(false);
|
|
break;
|
|
case LOC.SETMIXED:
|
|
_debug('Mixed Mode on');
|
|
vm.mixed(true);
|
|
break;
|
|
case LOC.CLRHIRES:
|
|
_debug('LoRes Mode');
|
|
vm.hires(false);
|
|
break;
|
|
case LOC.SETHIRES:
|
|
_debug('HiRes Mode');
|
|
vm.hires(true);
|
|
break;
|
|
case LOC.PAGE1:
|
|
vm.page(1);
|
|
break;
|
|
case LOC.PAGE2:
|
|
vm.page(2);
|
|
break;
|
|
case LOC.SETAN0:
|
|
_debug('Annunciator 0 on');
|
|
_annunciators[0] = true;
|
|
break;
|
|
case LOC.SETAN1:
|
|
_debug('Annunciator 1 on');
|
|
_annunciators[1] = true;
|
|
break;
|
|
case LOC.SETAN2:
|
|
_debug('Annunciator 2 on');
|
|
_annunciators[2] = true;
|
|
break;
|
|
case LOC.SETAN3:
|
|
_debug('Annunciator 3 on');
|
|
_annunciators[3] = true;
|
|
break;
|
|
case LOC.CLRAN0:
|
|
_debug('Annunciator 0 off');
|
|
_annunciators[0] = false;
|
|
break;
|
|
case LOC.CLRAN1:
|
|
_debug('Annunciator 1 off');
|
|
_annunciators[1] = false;
|
|
break;
|
|
case LOC.CLRAN2:
|
|
_debug('Annunciator 2 off');
|
|
_annunciators[2] = false;
|
|
break;
|
|
case LOC.CLRAN3:
|
|
_debug('Annunciator 3 off');
|
|
_annunciators[3] = false;
|
|
break;
|
|
case LOC.PB0:
|
|
result = _button[0] ? 0x80 : 0;
|
|
break;
|
|
case LOC.PB1:
|
|
result = _button[1] ? 0x80 : 0;
|
|
break;
|
|
case LOC.PB2:
|
|
result = _button[2] ? 0x80 : 0;
|
|
break;
|
|
case LOC.PADDLE0:
|
|
result = (delta < (_paddle[0] * 2756) ? 0x80 : 0x00);
|
|
break;
|
|
case LOC.PADDLE1:
|
|
result = (delta < (_paddle[1] * 2756) ? 0x80 : 0x00);
|
|
break;
|
|
case LOC.PADDLE2:
|
|
result = (delta < (_paddle[2] * 2756) ? 0x80 : 0x00);
|
|
break;
|
|
case LOC.PADDLE3:
|
|
result = (delta < (_paddle[3] * 2756) ? 0x80 : 0x00);
|
|
break;
|
|
case LOC.ACCEL:
|
|
if (val !== undefined) {
|
|
_updateKHz(val & 0x01 ? 1023 : 4096);
|
|
}
|
|
break;
|
|
case LOC.TAPEIN:
|
|
if (_tapeOffset == -1) {
|
|
_tapeOffset = 0;
|
|
_tapeNext = now;
|
|
}
|
|
|
|
if (_tapeOffset < _tape.length) {
|
|
_tapeCurrent = _tape[_tapeOffset][1];
|
|
while (now >= _tapeNext) {
|
|
if ((_tapeOffset % 1000) === 0) {
|
|
debug('Read ' + (_tapeOffset / 1000));
|
|
}
|
|
_tapeCurrent = _tape[_tapeOffset][1];
|
|
_tapeNext += _tape[_tapeOffset++][0];
|
|
}
|
|
|
|
}
|
|
|
|
result = _tapeCurrent ? 0x80 : 0x00;
|
|
break;
|
|
|
|
default:
|
|
switch (off & 0xf0) {
|
|
case LOC.KEYBOARD: // C00x
|
|
result = _key;
|
|
break;
|
|
case LOC.STROBE: // C01x
|
|
_key &= 0x7f;
|
|
if (_buffer.length > 0) {
|
|
val = _buffer.shift();
|
|
if (val == '\n') {
|
|
val = '\r';
|
|
}
|
|
_key = val.charCodeAt(0) | 0x80;
|
|
}
|
|
result = (_keyDown ? 0x80 : 0x00) | _key;
|
|
break;
|
|
case LOC.TAPEOUT: // C02x
|
|
_phase = -_phase;
|
|
_didAudio = true;
|
|
_tick();
|
|
break;
|
|
case LOC.SPEAKER: // C03x
|
|
_phase = -_phase;
|
|
_didAudio = true;
|
|
_tick();
|
|
break;
|
|
case LOC.C040STB: // C04x
|
|
// I/O Strobe
|
|
break;
|
|
case LOC.PDLTRIG: // C07x
|
|
_trigger = cpu.cycles();
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (val !== undefined) {
|
|
result = undefined;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
return {
|
|
start: function apple2io_start() {
|
|
return 0xc0;
|
|
},
|
|
|
|
end: function apple2io_end() {
|
|
return 0xcf;
|
|
},
|
|
|
|
ioSwitch: function apple2io_ioSwitch(off, val) {
|
|
var result;
|
|
if (off < 0x80) {
|
|
result = _access(off, val);
|
|
} else {
|
|
var slot = (off & 0x70) >> 4;
|
|
var card = _slot[slot];
|
|
if (card && card.ioSwitch) {
|
|
result = card.ioSwitch(off, val);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
},
|
|
|
|
reset: function apple2io_reset() {
|
|
for (var slot = 0; slot < 8; slot++) {
|
|
var card = _slot[slot];
|
|
if (card && card.reset) {
|
|
card.reset();
|
|
}
|
|
}
|
|
vm.reset();
|
|
},
|
|
|
|
blit: function apple2io_blit() {
|
|
var card = _slot[3];
|
|
if (card && card.blit) {
|
|
return card.blit();
|
|
}
|
|
return false;
|
|
},
|
|
|
|
read: function apple2io_read(page, off) {
|
|
var result = 0;
|
|
var slot;
|
|
var card;
|
|
|
|
switch (page) {
|
|
case 0xc0:
|
|
result = this.ioSwitch(off, undefined);
|
|
break;
|
|
case 0xc1:
|
|
case 0xc2:
|
|
case 0xc3:
|
|
case 0xc4:
|
|
case 0xc5:
|
|
case 0xc6:
|
|
case 0xc7:
|
|
slot = page & 0x0f;
|
|
card = _slot[slot];
|
|
if (_auxRom != card) {
|
|
// _debug('Setting auxRom to slot', slot);
|
|
_auxRom = card;
|
|
}
|
|
if (card) {
|
|
result = card.read(page, off);
|
|
}
|
|
break;
|
|
default:
|
|
if (_auxRom) {
|
|
result = _auxRom.read(page, off);
|
|
}
|
|
break;
|
|
}
|
|
return result;
|
|
},
|
|
|
|
write: function apple2io_write(page, off, val) {
|
|
var slot;
|
|
var card;
|
|
|
|
switch (page) {
|
|
case 0xc0:
|
|
this.ioSwitch(off, val);
|
|
break;
|
|
case 0xc1:
|
|
case 0xc2:
|
|
case 0xc3:
|
|
case 0xc4:
|
|
case 0xc5:
|
|
case 0xc6:
|
|
case 0xc7:
|
|
slot = page & 0x0f;
|
|
card = _slot[slot];
|
|
if (_auxRom != card) {
|
|
// _debug('Setting auxRom to slot', slot);
|
|
_auxRom = card;
|
|
}
|
|
if (card) {
|
|
card.write(page, off, val);
|
|
}
|
|
break;
|
|
default:
|
|
if (_auxRom) {
|
|
_auxRom.write(page, off, val);
|
|
}
|
|
break;
|
|
}
|
|
},
|
|
|
|
getState: function apple2io_getState() {
|
|
return {
|
|
annunciators: _annunciators[0]
|
|
};
|
|
},
|
|
setState: function apple2io_setState(state) {
|
|
_annunciators = state.annunciators;
|
|
},
|
|
|
|
setSlot: function apple2io_setSlot(slot, card) {
|
|
_slot[slot] = card;
|
|
},
|
|
|
|
keyDown: function apple2io_keyDown(ascii) {
|
|
_keyDown = true;
|
|
_key = ascii | 0x80;
|
|
},
|
|
|
|
keyUp: function apple2io_keyUp() {
|
|
_keyDown = false;
|
|
},
|
|
|
|
buttonDown: function apple2io_buttonDown(b) {
|
|
_button[b] = true;
|
|
},
|
|
|
|
buttonUp: function apple2io_buttonUp(b) {
|
|
_button[b] = false;
|
|
},
|
|
|
|
paddle: function apple2io_paddle(p, v) {
|
|
_paddle[p] = v;
|
|
},
|
|
|
|
updateKHz: function apple2io_updateKHz(khz) {
|
|
_updateKHz(khz);
|
|
},
|
|
|
|
getKHz: function apple2io_updateKHz() {
|
|
return _khz;
|
|
},
|
|
|
|
setKeyBuffer: function apple2io_setKeyBuffer(buffer) {
|
|
_buffer = buffer.split('');
|
|
if (_buffer.length > 0) {
|
|
_keyDown = true;
|
|
_key = _buffer.shift().charCodeAt(0) | 0x80;
|
|
}
|
|
},
|
|
|
|
setTape: function apple2io_setTape(tape) {
|
|
debug('Tape length: ' + tape.length);
|
|
_tape = tape;
|
|
_tapeOffset = -1;
|
|
},
|
|
|
|
sampleRate: function sampleRate(rate, sample_size) {
|
|
_rate = rate;
|
|
_sample_size = sample_size;
|
|
_sample = new Array(_sample_size);
|
|
_sampleIdx = 0;
|
|
_calcSampleRate();
|
|
},
|
|
|
|
tick: function tick() {
|
|
_tick();
|
|
for (var idx = 0; idx < 8; idx++) {
|
|
if (_slot[idx] && _slot[idx].tick) {
|
|
_slot[idx].tick();
|
|
}
|
|
}
|
|
},
|
|
|
|
addSampleListener: function addSampleListener(cb) {
|
|
_audioListener = cb;
|
|
},
|
|
|
|
annunciator: function annunciator(idx) {
|
|
return _annunciators[idx];
|
|
},
|
|
|
|
cycles: function apple2io_cycles() {
|
|
return cpu.cycles();
|
|
}
|
|
};
|
|
}
|