mirror of
https://github.com/whscullin/apple2js.git
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338 lines
11 KiB
JavaScript
338 lines
11 KiB
JavaScript
/* -*- mode: JavaScript; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* Copyright 2010-2013 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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/*globals debug: false, toHex: false, each: false */
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/*exported Apple2IO */
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function Apple2IO(cpu, callbacks)
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{
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var SAMPLE_RATE = 64;
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var _buffer = [];
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var _key = 0;
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var _keyDown = false;
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var _button = [false, false, false];
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var _paddle = [0.0, 0.0, 0.0, 0,0];
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var _phase = -1;
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var _sample = [];
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var _oldSample = [];
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var _sampleTime = 0;
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var _high = "%A0";
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var _low = "%60";
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var _trigger = 0;
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var LOC = {
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KEYBOARD: 0x00, // keyboard data (latched) (Read),
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CLR80VID: 0x0C, // clear 80 column mode
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SET80VID: 0x0D, // set 80 column mode
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CLRALTCH: 0x0E, // clear 80 column mode
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SETALTCH: 0x0F, // set 80 column mode
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STROBE: 0x10, // clear bit 7 of keyboard data ($C000)
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RDTEXT: 0x1A, // using text mode
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RDMIXED: 0x1B, // using mixed mode
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RDPAGE2: 0x1C, // using text/graphics page2
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RDHIRES: 0x1D, // using Hi-res graphics mode
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RDALTCH: 0x1E, // using alternate character set
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RD80VID: 0x1F, // using 80-column display mode
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TAPEOUT: 0x20, // toggle the cassette output.
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SPEAKER: 0x30, // toggle speaker diaphragm
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CLRTEXT: 0x50, // display graphics
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SETTEXT: 0x51, // display text
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CLRMIXED: 0x52, // clear mixed mode- enable full graphics
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SETMIXED: 0x53, // enable graphics/text mixed mode
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PAGE1: 0x54, // select text/graphics page1
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PAGE2: 0x55, // select text/graphics page2
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CLRHIRES: 0x56, // select Lo-res
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SETHIRES: 0x57, // select Hi-res
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CLRAN0: 0x58, // Set annunciator-0 output to 0
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SETAN0: 0x59, // Set annunciator-0 output to 1
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CLRAN1: 0x5A, // Set annunciator-1 output to 0
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SETAN1: 0x5B, // Set annunciator-1 output to 1
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CLRAN2: 0x5C, // Set annunciator-2 output to 0
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SETAN2: 0x5D, // Set annunciator-2 output to 1
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CLRAN3: 0x5E, // Set annunciator-3 output to 0
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SETAN3: 0x5F, // Set annunciator-3 output to 1
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TAPEIN: 0x60, // bit 7: data from cassette
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PB0: 0x61, // game Pushbutton 0 / open apple (command) key data
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PB1: 0x62, // game Pushbutton 1 / closed apple (option) key data
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PB2: 0x63, // game Pushbutton 2 (read)
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PADDLE0: 0x64, // bit 7: status of pdl-0 timer (read)
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PADDLE1: 0x65, // bit 7: status of pdl-1 timer (read)
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PADDLE2: 0x66, // bit 7: status of pdl-2 timer (read)
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PADDLE3: 0x67, // bit 7: status of pdl-3 timer (read)
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PDLTRIG: 0x70, // trigger paddles
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SETIOUDIS:0x7E, // Enable double hires
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CLRIOUDIS:0x7F // Disable double hires
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};
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function _debug() {
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// debug.apply(arguments);
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}
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var _locs = [];
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function _access(off) {
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var result = 0;
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var now = cpu.cycles();
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var delta = now - _trigger;
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switch (off) {
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case LOC.CLR80VID:
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// _debug("80 Column Mode off");
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if ('_80col' in callbacks) callbacks._80col(false);
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break;
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case LOC.SET80VID:
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// _debug("80 Column Mode on");
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if ('_80col' in callbacks) callbacks._80col(true);
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break;
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case LOC.CLRALTCH:
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// _debug("Alt Char off");
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if ('altchar' in callbacks) callbacks.altchar(false);
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break;
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case LOC.SETALTCH:
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// _debug("Alt Char on");
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if ('altchar' in callbacks) callbacks.altchar(true);
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break;
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case LOC.CLRTEXT:
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_debug("Graphics Mode");
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callbacks.text(false);
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break;
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case LOC.SETTEXT:
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_debug("Text Mode");
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callbacks.text(true);
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break;
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case LOC.CLRMIXED:
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_debug("Mixed Mode off");
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callbacks.mixed(false);
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break;
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case LOC.SETMIXED:
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_debug("Mixed Mode on");
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callbacks.mixed(true);
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break;
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case LOC.CLRHIRES:
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_debug("LoRes Mode");
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callbacks.hires(false);
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break;
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case LOC.SETHIRES:
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_debug("HiRes Mode");
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callbacks.hires(true);
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break;
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case LOC.PAGE1:
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callbacks.page(1);
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break;
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case LOC.PAGE2:
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callbacks.page(2);
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break;
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case LOC.RDTEXT:
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if ('isText' in callbacks)
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result = callbacks.isText() ? 0x80 : 0x0;
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break;
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case LOC.RDMIXED:
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if ('isMixed' in callbacks)
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result = callbacks.isMixed() ? 0x80 : 0x0;
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break;
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case LOC.RDPAGE2:
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if ('isPage2' in callbacks)
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result = callbacks.isPage2() ? 0x80 : 0x0;
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break;
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case LOC.RDHIRES:
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if ('isHires' in callbacks)
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result = callbacks.isHires() ? 0x80 : 0x0;
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break;
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case LOC.RD80VID:
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if ('is80Col' in callbacks)
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result = callbacks.is80Col() ? 0x80 : 0x0;
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break;
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case LOC.RDALTCH:
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if ('isAltChar' in callbacks)
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result = callbacks.isAltChar() ? 0x80 : 0x0;
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break;
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case LOC.SETAN0:
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_debug('Annunciator 0 on');
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if ('annunciator' in callbacks) callbacks.annunicator(0, true);
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break;
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case LOC.SETAN1:
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_debug('Annunciator 1 on');
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if ('annunciator' in callbacks) callbacks.annunicator(1, true);
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break;
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case LOC.SETAN2:
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_debug('Annunciator 2 on');
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if ('annunciator' in callbacks) callbacks.annunicator(2, true);
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break;
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case LOC.SETAN3:
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_debug('Annunciator 3 on');
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if ('annunciator' in callbacks) callbacks.annunicator(3, true);
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if ('doublehires' in callbacks) callbacks.doublehires(false);
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break;
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case LOC.CLRAN0:
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_debug('Annunciator 0 off');
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if ('annunciator' in callbacks) callbacks.annunicator(0, false);
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break;
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case LOC.CLRAN1:
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_debug('Annunciator 1 off');
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if ('annunciator' in callbacks) callbacks.annunicator(1, false);
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break;
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case LOC.CLRAN2:
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_debug('Annunciator 2 off');
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if ('annunciator' in callbacks) callbacks.annunicator(2, false);
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break;
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case LOC.CLRAN3:
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_debug('Annunciator 3 off');
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if ('annunciator' in callbacks) callbacks.annunicator(3, false);
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if ('doublehires' in callbacks) callbacks.doublehires(true);
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break;
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case LOC.SPEAKER:
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if (_sampleTime) {
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var phase = _phase > 0 ? _high : _low;
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for (; _sampleTime < now; _sampleTime += SAMPLE_RATE) {
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_sample.push(phase);
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}
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_phase = -_phase;
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}
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break;
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case LOC.STROBE:
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_key &= 0x7f;
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if (_buffer.length > 0) {
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_key = _buffer.shift().charCodeAt(0) | 0x80;
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}
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result = _keyDown ? 0x80 : 0x00;
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break;
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case LOC.KEYBOARD:
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result = _key;
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break;
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case LOC.PB0:
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result = _button[0] ? 0x80 : 0;
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break;
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case LOC.PB1:
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result = _button[1] ? 0x80 : 0;
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break;
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case LOC.PB2:
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result = _button[2] ? 0x80 : 0;
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break;
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case LOC.PADDLE0:
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result = (delta < (_paddle[0] * 2560) ? 0x80 : 0x00);
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break;
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case LOC.PADDLE1:
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result = (delta < (_paddle[1] * 2560) ? 0x80 : 0x00);
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break;
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case LOC.PADDLE2:
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result = (delta < (_paddle[2] * 2560) ? 0x80 : 0x00);
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break;
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case LOC.PADDLE3:
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result = (delta < (_paddle[3] * 2560) ? 0x80 : 0x00);
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break;
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case LOC.PDLTRIG:
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_trigger = cpu.cycles();
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break;
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}
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return result;
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}
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return {
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registerSwitches: function apple2io_registerSwitches(a, locs) {
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each(locs, function(key) {
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var val = locs[key];
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if (_locs[val]) {
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debug('duplicate switch! ' + toHex(val));
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}
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_locs[val] = a;
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});
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},
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start: function apple2io_start() {
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this.registerSwitches(this, LOC);
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return 0xc0;
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},
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end: function apple2io_end() {
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return 0xc0;
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},
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read: function apple2io_read(page, off) {
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var result = 0;
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if (_locs[off]) {
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result = _locs[off].ioSwitch(off);
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} else {
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debug("I/O read: C0" + toHex(off));
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}
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return result;
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},
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write: function apple2io_write(page, off, val) {
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if (_locs[off]) {
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_locs[off].ioSwitch(off, val);
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} else {
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debug("I/O write: C0" + toHex(off));
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}
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},
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getState: function apple2io_getState() { return {}; },
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setState: function apple2io_setState() { },
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ioSwitch: function apple2io_ioSwitch(off, val) {
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return _access(off, val);
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},
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keyDown: function apple2io_keyDown(ascii) {
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_keyDown = true;
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_key = ascii | 0x80;
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},
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keyUp: function apple2io_keyUp() {
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_keyDown = false;
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_key = 0;
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},
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buttonDown: function apple2io_buttonDown(b) {
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_button[b] = true;
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},
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buttonUp: function apple2io_buttonUp(b) {
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_button[b] = false;
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},
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paddle: function apple2io_paddle(p, v) {
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_paddle[p] = v;
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},
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getSample: function apple2io_getSample(stop) {
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var result = _sample;
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var now = cpu.cycles();
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//if (_sampleTime) {
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// var phase = _phase > 0 ? _high : _low;
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// for (; _sampleTime < now; _sampleTime += SAMPLE_RATE)
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// _sample.push(phase);
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//}
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_sample = _oldSample;
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_sample.length = 0;
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_sampleTime = stop ? 0 : now;
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_oldSample = result;
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return result;
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},
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floatAudio: function apple2io_floatAudio(rate) {
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_low = -0.5;
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_high = 0.5;
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SAMPLE_RATE = 1023000.0 / rate;
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},
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byteAudio: function apple2io_floatAudio(rate) {
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_low = 0xa0;
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_high = 0x60;
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SAMPLE_RATE = 1023000.0 / rate;
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},
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setKeyBuffer: function apple2io_setKeyBuffer(buffer) {
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_buffer = buffer.split("");
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if (_buffer.length > 0) {
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_keyDown = true;
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_key = _buffer.shift().charCodeAt(0) | 0x80;
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}
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}
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};
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}
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