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/js/sim8800.js:
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1 | /**
2 | * Copyright 2020 wixette@gmail.com
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | * @fileoverview Altair 8800 front panel simulator.
17 | */
18 |
19 |
20 | /**
21 | * The simulator.
22 | */
23 | class Sim8800 {
24 | /**
25 | * @param {number} memSize The memory size, in bytes.
26 | * @param {number} clockRate The clock rate.
27 | * @param {function(Array)?} setAddressLedsCallback The
28 | * callback to set address LEDs.
29 | * @param {function(Array)?} setDataLedsCallback The
30 | * callback to set data LEDs.
31 | * @param {function(boolean)?} setWaitLedCallback The callback to
32 | * set the WAIT LED.
33 | * @param {function(boolean)?} setStatusLedsCallback The callback to
34 | * set the STATUS LEDs.
35 | * @param {function():number?} getInputAddressCallback The
36 | * callback to get the input word from address/data switches.
37 | * @param {function(string)?} dumpCpuCallback The callback to receive
38 | * CPU status dump, in HTML string.
39 | * @param {function(string)?} dumpMemCallback The callback to receive
40 | * memory contents dump, in HTML string.
41 | */
42 | constructor(memSize, clockRate,
43 | setAddressLedsCallback, setDataLedsCallback,
44 | setWaitLedCallback, setStatusLedsCallback,
45 | getInputAddressCallback,
46 | dumpCpuCallback, dumpMemCallback) {
47 | this.clockRate = clockRate;
48 | this.mem = new Array(memSize);
49 | this.setAddressLedsCallback = setAddressLedsCallback;
50 | this.setDataLedsCallback = setDataLedsCallback;
51 | this.setWaitLedCallback = setWaitLedCallback;
52 | this.setStatusLedsCallback = setStatusLedsCallback;
53 | this.getInputAddressCallback = getInputAddressCallback;
54 | this.dumpCpuCallback = dumpCpuCallback;
55 | this.dumpMemCallback = dumpMemCallback;
56 | this.isPoweredOn = false;
57 | this.isRunning = false;
58 | this.lastAddress = 0;
59 | this.initMem();
60 | CPU8080.init(this.getWriteByteCallback(),
61 | this.getReadByteCallback(),
62 | null, /* not used. */
63 | this.getWritePortCallback(),
64 | this.getReadPortCallback());
65 | }
66 |
67 | /**
68 | * Formats a number to fixed length hex string.
69 | * @param {number} n The number to be formatted.
70 | * @param {number} len The output length, with leading zeros.
71 | */
72 | static toHex(n, len) {
73 | var leadingZeros = (new Array(len)).fill('0').join('');
74 | return (leadingZeros + n.toString(16)).substr(-len);
75 | }
76 |
77 | /**
78 | * Parses a number into an array of binary bits.
79 | * @param {number} data The data to be parsed.
80 | * @param {number} numBits Number of bits to be parsed.
81 | * @return {Array} Sequence of 0 or 1, from the lowest bit to
82 | * the highest bit.
83 | */
84 | static parseBits(data, numBits) {
85 | var bits = [];
86 | for (let i = 0; i < numBits; i++) {
87 | bits.push(data & 1 != 0 ? 1 : 0);
88 | data >>>= 1;
89 | }
90 | return bits;
91 | }
92 |
93 | /**
94 | * Fills the memory with dummy bytes.
95 | */
96 | initMem(random = false) {
97 | if (random) {
98 | for (let i = 0; i < this.mem.length; i++) {
99 | this.mem[i] = Math.floor(Math.random() * 256);
100 | }
101 | } else {
102 | this.mem.fill(0);
103 | }
104 | }
105 |
106 | /**
107 | * Loads data into memory.
108 | * @param {number} address The start address to load the data/program.
109 | * @param {Array} data The array of data.
110 | */
111 | loadData(address, data) {
112 | if (!this.isPoweredOn)
113 | return;
114 | for (let i = 0; i < data.length && address < this.mem.length; i++) {
115 | this.mem[address++] = data[i];
116 | }
117 | this.dumpMem();
118 | }
119 |
120 | /**
121 | * Loads data into memory.
122 | * @param {number} address The start address to load the data/program.
123 | * @param {string} hexString Data encoded in hex string, like 'c3 00 00'.
124 | */
125 | loadDataAsHexString(address, hexString) {
126 | if (!this.isPoweredOn || !hexString)
127 | return;
128 | var data = hexString.split(' ');
129 | for (let i = 0; i < data.length && address < this.mem.length; i++) {
130 | var byte = parseInt('0x' + data[i]);
131 | if (!isNaN(byte)) {
132 | this.mem[address++] = byte;
133 | }
134 | }
135 | this.dumpMem();
136 | }
137 |
138 | /**
139 | * Dumps the memory to HTML, for debugging or monitoring.
140 | */
141 | dumpMem() {
142 | if (this.dumpMemCallback) {
143 | var sb = ['