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Move display memory and add a pointer to display memory

This commit is contained in:
n loewen 2023-08-02 10:38:58 +01:00
parent c732f4408f
commit 91ff26fdea
3 changed files with 10 additions and 3 deletions
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6
assembler.js
View File

@ -5,7 +5,8 @@ const printMemory = require('./print-memory.js');
// 3 = always print
// 4 = silent
const DEBUG = 4;
const INITIAL_IP_ADDRESS = 32;
const INITIAL_IP_ADDRESS = 48;
const START_OF_DISPLAY_MEM = 0;
const mnemonicsWithOptionalArgs = ['end', 'cfc', 'chp'];
const mnemonics2opcodes = {
@ -22,7 +23,10 @@ const mnemonics2opcodes = {
function decodeInstructions(str) {
let lines = str.split(/\n/); // returns an array of lines
let machineCode = new Array(INITIAL_IP_ADDRESS).fill(0);
machineCode[0] = START_OF_DISPLAY_MEM;
let labels = {};
let IP = INITIAL_IP_ADDRESS;
for (let i = 0; i < lines.length; i++) {

5
display.js
View File

@ -1,5 +1,8 @@
const START_OF_DISPLAY_MEM = 0;
exports.printDisplay = (mem) => {
for (let i = 0; i < 16; i += 4) {
const disp = START_OF_DISPLAY_MEM;
for (let i = disp; i < disp + 16; i += 4) {
console.log(`${pad(mem[i])} ${pad(mem[i+1])} ${pad(mem[i+2])} ${pad(mem[i+3])}`);
}
}

2
simulator.js
View File

@ -3,7 +3,7 @@
// - instructions are two bytes long:
// one byte for the opcode, one for the argument
const INITIAL_IP_ADDRESS = 32;
const INITIAL_IP_ADDRESS = 48;
const CYCLE_LIMIT = 128; // max number of times to step the CPU, to stop endless loops
const display = require('./display.js');