mirror of
https://github.com/whscullin/apple1js.git
synced 2024-12-28 10:30:06 +00:00
98 lines
3.0 KiB
JavaScript
98 lines
3.0 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.
|
|
*/
|
|
|
|
export default function Apple1IO(text) {
|
|
var _key = 0;
|
|
var _keyReady = false;
|
|
|
|
var _displayReady = false;
|
|
var _nextDSP = 0;
|
|
var _buffer = [];
|
|
|
|
var LOC = {
|
|
KBD: 0x10,
|
|
KBDRDY: 0x011,
|
|
DSP: 0x12,
|
|
DSPCTL: 0x13
|
|
};
|
|
|
|
return {
|
|
start: function() { return 0xd0; },
|
|
end: function() { return 0xd0; },
|
|
read: function(page, off) {
|
|
var result = 0;
|
|
off &= 0x13;
|
|
switch (off) {
|
|
case LOC.KBD:
|
|
// Keyboard
|
|
if (_buffer.length) {
|
|
result = _buffer.shift().toUpperCase().charCodeAt(0) & 0x7f;
|
|
_keyReady = (_buffer.length > 0);
|
|
} else {
|
|
result = _key;
|
|
_keyReady = false;
|
|
}
|
|
result |= 0x80;
|
|
break;
|
|
case LOC.KBDRDY:
|
|
result = _keyReady ? 0x80 : 0x00;
|
|
break;
|
|
case LOC.DSP:
|
|
// Display
|
|
// result = (Math.random() > 0.5) ? 0x80 : 0x00;
|
|
result = (Date.now() > _nextDSP) ? 0x00 : 0x80;
|
|
break;
|
|
case LOC.DSPCTL:
|
|
break;
|
|
}
|
|
return result;
|
|
},
|
|
write: function(page, off, val) {
|
|
off &= 0x13;
|
|
switch (off) {
|
|
case LOC.KBD:
|
|
break;
|
|
case LOC.KBDRDY:
|
|
break;
|
|
case LOC.DSP:
|
|
// Display
|
|
if (_displayReady) {
|
|
text.write(val);
|
|
}
|
|
_nextDSP = Date.now() + ((_buffer.length > 0) ? 0 : 17);
|
|
break;
|
|
case LOC.DSPCTL:
|
|
// Don't pretend we care what the value was...
|
|
_displayReady = true;
|
|
break;
|
|
}
|
|
},
|
|
reset: function apple1io_reset() {
|
|
text.clear();
|
|
_buffer = [];
|
|
_keyReady = false;
|
|
_displayReady = false;
|
|
},
|
|
keyUp: function apple1io_keyUp() {
|
|
},
|
|
keyDown: function apple1io_keyDown(key) {
|
|
_key = key;
|
|
_keyReady = true;
|
|
},
|
|
paste: function apple1io_paste(buffer) {
|
|
buffer = buffer.replace(/\/\/.*\n/g, '');
|
|
buffer = buffer.replace(/\n/g, '\r');
|
|
_buffer = buffer.split('');
|
|
_keyReady = true;
|
|
}
|
|
};
|
|
}
|