83 lines
2.7 KiB
JavaScript
83 lines
2.7 KiB
JavaScript
/**
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* Display a table of memory locations.
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* Call with [start] and [end] indices to display a range.
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* @param {Uint8Array} mem - Memory to display
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* @param {number} [start] - A start-index, in decimal
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* @param {number} [end] - An end-index, in decimal
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**/
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const logMemory = (mem, start=0, end=mem.length) => {
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// This function can only handle
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// an even number of array entries
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if ((start % 2) === 1) { start -= 1; }
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if ((end % 2) === 1) { end += 1; }
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mem = mem.slice(start, end);
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console.log(`┌────────┬────────┬─────────┐`);
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console.log(`│ addr │ opcode │ operand │`);
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console.log(`├────────┼────────┼─────────┤`);
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//for (let i = 0; i < mem.length; i += 2) {
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for (let i = start; i < mem.length; i +=2) {
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console.log(`│ ${num2hex(i)} │ ${num2hex(mem[i])} │ ${num2hex(mem[i+1])} │`);
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// Add a blank row every 4 lines:
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if (((i + 2) % 8) === 0) {
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if ((i < (mem.length - 2))) {
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console.log(`│ │ │ │`);
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}
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}
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}
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console.log(`└────────┴────────┴─────────┘`);
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}
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const logRunningHeader = () => {
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console.log();
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let time = new Date();
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console.log( `┌─────────────────────┐`);
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console.log( `│ Running at ${time.toLocaleTimeString('en-GB')} │` );
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console.log( `└─────────────────────┘`);
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}
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/**
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* @param {number} num
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* @returns {string}
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*/
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const num2hex = (num) => num.toString(16).toUpperCase().padStart(2, "0");
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/**
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* @param {string} hex
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* @returns {number}
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*/
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const hex2num = (hex) => parseInt(hex, 16);
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/**
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* Convert a number to binary, padded to 8 bits
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* See here for an explanation: https://stackoverflow.com/questions/9939760/how-do-i-convert-an-integer-to-binary-in-javascript
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* @param {number} num
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* @returns {string} binary representation of the input
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**/
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const num2bin = (num) => (num >>> 0).toString(2).padStart(8, "0");
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/**
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* Convert a number to binary, padded to 4 bits
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* See here for an explanation: https://stackoverflow.com/questions/9939760/how-do-i-convert-an-integer-to-binary-in-javascript
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* @param {number} num
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* @returns {string} binary representation of the input
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**/
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const num2bin_4bit = (num) => (num >>> 0).toString(2).padStart(4, "0");
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/**
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* @param {string} bin
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* @returns {number}
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*/
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const bin2num = (bin) => parseInt(bin, 2)
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module.exports = {
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"logMemory": logMemory,
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"logRunningHeader": logRunningHeader,
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"num2hex": num2hex,
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"hex2num": hex2num,
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"num2bin": num2bin,
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"num2bin_4bit": num2bin_4bit,
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"bin2num": bin2num,
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} |