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https://github.com/whscullin/apple2js.git
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dc13b6a59a
Like the DOS 3.3 and ProDOS sector order issues, this change fixes the
physical order of the sectors on 13-sector disks when nibblized.
This change also adds tests for the 13-sector format to verify the
sector order.
One of the crazy things is that _Beneath Apple DOS_ failed me in this
instance because it doesn't discuss what happens to the last byte in
"5 and 3" encoding anywhere (AFAICT). I went back to the DOS 3.1
source released by the Computer History Museum here:
https://computerhistory.org/blog/apple-ii-dos-source-code/
The code is in `appdos31.lst` in the `POSTNIB` routine on line 4777.
56 lines
1.4 KiB
TypeScript
56 lines
1.4 KiB
TypeScript
import { byte } from '../../../../js/types';
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function generateBytesInOrder() {
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const data: byte[][][] = [];
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for (let t = 0; t < 35; t++) {
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const track: byte[][] = [];
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for (let s = 0; s < 13; s++) {
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const sector: byte[] = [];
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for (let b = 0; b < 256; b++) {
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sector[b] = b;
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}
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track[s] = sector;
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}
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data[t] = track;
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}
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return data;
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}
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export const BYTES_IN_ORDER: byte[][][] = generateBytesInOrder();
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function generateBytesBySector() {
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const data: byte[][][] = [];
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for (let t = 0; t < 35; t++) {
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const track: byte[][] = [];
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for (let s = 0; s < 13; s++) {
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const sector: byte[] = [];
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for (let b = 0; b < 256; b++) {
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sector[b] = s;
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}
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track[s] = sector;
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}
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data[t] = track;
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}
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return data;
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}
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export const BYTES_BY_SECTOR: byte[][][] = generateBytesBySector();
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function generateBytesByTrack() {
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const data: byte[][][] = [];
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for (let t = 0; t < 35; t++) {
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const track: byte[][] = [];
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for (let s = 0; s < 13; s++) {
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const sector: byte[] = [];
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for (let b = 0; b < 256; b++) {
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sector[b] = t;
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}
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track[s] = sector;
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}
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data[t] = track;
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}
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return data;
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}
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export const BYTES_BY_TRACK: byte[][][] = generateBytesByTrack();
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