84 lines
3.3 KiB
TypeScript
84 lines
3.3 KiB
TypeScript
// Breadboard component for the LogicSimulator used on the 8-bit-computer
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// Copyright (C) 2022 Sascha Nitsch
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// eslint-disable-next-line @typescript-eslint/no-unused-vars
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class EightBitALU extends BaseComponent {
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private write: boolean | string;
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private sub: boolean | string;
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private ret: number;
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private a = 0;
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private b = 0;
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private r = 0;
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constructor(simulator: Simulator, id: string, param: BaseComponentParam) {
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super(simulator, id, param);
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this.pins.set('sub', new TriState(this, -15, 90));
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this.sub = 'float';
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this.pins.set('write', new TriState(this, 20, 90));
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this.write = 'float';
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this.ret = 0;
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for (let i = 0; i < 8; ++i) {
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this.pins.set('A' + (7 - i), new TriState(this, -40, i * 10 - 80));
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this.pins.set('B' + (7 - i), new TriState(this, -40, i * 10 + 10));
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this.pins.set('D' + (7 - i), new TriState(this, 40, i * 20 - 70));
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this.stateMapBool.set('A' + (7 - i), true);
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this.stateMapBool.set('B' + (7 - i), true);
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this.stateMapBool.set('D' + (7 - i), true);
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}
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}
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setup(canvas: SVGElement) {
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super.doSetup('eightbitalu', canvas);
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}
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io() {
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for (let i = 0; i < 8; ++i) {
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this.stateMapBool.set('A' + i, this.binary(this.getPin('A' + i).getAndReset(), true));
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this.stateMapBool.set('B' + i, this.binary(this.getPin('B' + i).getAndReset(), true));
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this.stateMapBool.set('D' + i, this.binary(this.getPin('D' + i).getAndReset(), true));
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}
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this.sub = this.binary(this.getPin('sub').getAndReset(), true);
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this.write = this.binary(this.getPin('write').getAndReset(), true);
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this.a =
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this.asint(this.getStateBool('A7'), 128) +
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this.asint(this.getStateBool('A6'), 64) +
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this.asint(this.getStateBool('A5'), 32) +
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this.asint(this.getStateBool('A4'), 16) +
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this.asint(this.getStateBool('A3'), 8) +
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this.asint(this.getStateBool('A2'), 4) +
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this.asint(this.getStateBool('A1'), 2) +
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this.asint(this.getStateBool('A0'), 1);
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this.b =
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this.asint(this.getStateBool('B7'), 128) +
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this.asint(this.getStateBool('B6'), 64) +
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this.asint(this.getStateBool('B5'), 32) +
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this.asint(this.getStateBool('B4'), 16) +
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this.asint(this.getStateBool('B3'), 8) +
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this.asint(this.getStateBool('B2'), 4) +
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this.asint(this.getStateBool('B1'), 2) +
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this.asint(this.getStateBool('B0'), 1);
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}
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update(): boolean {
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const oldret = this.ret;
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this.ret = (this.sub ? this.a - this.b : this.a + this.b) & 0xff;
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for (let i = 0; i < 8; ++i) {
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const v = (this.ret >> i) & 1 ? WireState.high : WireState.low;
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this.getPin('D' + i).setState(this.write ? v : WireState.float);
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}
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return oldret !== this.ret;
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}
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}
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