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Added recognition for UniDOS 800K volumes (basically fixed 35 track

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and 16 sector bias in code).
This commit is contained in:
Robert Greene 2002-12-12 04:36:16 +00:00
parent 4b037eb100
commit 558ae20c80
2 changed files with 25 additions and 8 deletions
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28
src/com/webcodepro/applecommander/storage/Disk.java
View File

@ -350,7 +350,13 @@ public class Disk {
* with.
*/
protected int getOffset(int track, int sector) throws IllegalArgumentException {
if ((track * 16 + sector) * SECTOR_SIZE > getPhysicalSize()) {
int length = diskImage.length;
if (length != APPLE_140KB_DISK && length != APPLE_800KB_DISK) {
throw new IllegalArgumentException("Unrecognized DOS format!");
}
int sectorsPerTrack = 16;
if (length == APPLE_800KB_DISK) sectorsPerTrack = 32;
if ((track * sectorsPerTrack + sector) * SECTOR_SIZE > getPhysicalSize()) {
throw new IllegalArgumentException(
"The track (" + track + ") and sector (" + sector
+ ") do not match the disk image size.");
@ -362,7 +368,7 @@ public class Disk {
return ((track * 8) + blockInterleave[sector]) * BLOCK_SIZE
+ blockOffsets[sector] * SECTOR_SIZE;
} else if (isDosOrder()) {
return (track * 16 + sector) * SECTOR_SIZE;
return (track * sectorsPerTrack + sector) * SECTOR_SIZE;
} else {
throw new IllegalArgumentException(
"Unknown disk format.");
@ -382,15 +388,25 @@ public class Disk {
/**
* Test the disk format to see if this is a DOS 3.3 formatted
* disk.
* disk. This is a little nasty - since 800KB and 140KB images have
* different characteristics.
*/
public boolean isDosFormat() {
byte[] vtoc = readSector(17, 0);
return vtoc[0x01] == 17 // expect catalog to start on track 17
&& vtoc[0x02] == 15 // expect catalog to start on sector 15
&& (
vtoc[0x02] == 15 // expect catalog to start on sector 15 (140KB disk only!)
||
vtoc[0x02] == 31 // expect catalog to start on sector 31 (800KB disk only!)
)
&& vtoc[0x27] == 122 // expect 122 tract/sector pairs per sector
&& vtoc[0x34] == 35 // expect 35 tracks per disk (140KB disk only!)
&& vtoc[0x35] == 16 // expect 16 sectors per disk (140KB disk only!)
&& ((
vtoc[0x34] == 35 // expect 35 tracks per disk (140KB disk only!)
&& vtoc[0x35] == 16 // expect 16 sectors per disk (140KB disk only!)
) || (
vtoc[0x34] == 50 // expect 50 tracks per disk (800KB disk only!)
&& vtoc[0x35] == 32 // expect 32 sectors per disk (800KB disk only!)
))
&& vtoc[0x36] == 0 // bytes per sector (low byte)
&& vtoc[0x37] == 1; // bytes per sector (high byte)
}

5
src/com/webcodepro/applecommander/storage/DosFormatDisk.java
View File

@ -464,10 +464,11 @@ public class DosFormatDisk extends FormattedDisk {
}
/**
* Validate track/sector range.
* Validate track/sector range. This just validates the
* maximum values allowable for track and sector.
*/
protected void checkRange(int track, int sector) {
if (track > 35 || sector > 32) {
if (track > 50 || sector > 32) {
throw new IllegalArgumentException(
"Invalid track (" + track + "), sector (" + sector
+ ") combination.");