54 lines
1.2 KiB
TypeScript
54 lines
1.2 KiB
TypeScript
import { DiskDriver, Drive, DriverState } from './types';
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/** Returned state for an empty drive. */
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export interface EmptyDriverState extends DriverState { }
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/**
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* Driver for empty drives. This implementation does nothing except keep
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* the head clamped between tracks 0 and 34.
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*/
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export class EmptyDriver implements DiskDriver {
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constructor(private readonly drive: Drive) { }
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tick(): void {
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// do nothing
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}
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onQ6Low(): void {
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// do nothing
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}
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onQ6High(_readMode: boolean): void {
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// do nothing
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}
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onDriveOn(): void {
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// do nothing
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}
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onDriveOff(): void {
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// do nothing
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}
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clampTrack(): void {
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// For empty drives, the emulator clamps the track to 0 to 34,
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// but real Disk II drives can seek past track 34 by at least a
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// half track, usually a full track. Some 3rd party drives can
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// seek to track 39.
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if (this.drive.track < 0) {
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this.drive.track = 0;
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}
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if (this.drive.track > 34) {
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this.drive.track = 34;
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}
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}
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getState() {
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return {};
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}
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setState(_state: EmptyDriverState): void {
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// do nothing
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}
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}
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