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Added an empty 10Mb disk image formatted by PC-DOS 2.0 (currently used by one machine: 5160/cga/640kb); also fixed some issues uncovered in the process of creating the disk image (eg, a bug in the HDC's save logic when no image has been loaded), and made some fixes and optimizations in DiskDump

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Jeff Parsons 2017-06-01 15:32:17 -07:00 • committed by Jeff Parsons
commit 3e1aa196bd
13 changed files with 1871 additions and 1832 deletions
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6
modules/shared/lib/diskapi.js
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@ -89,8 +89,10 @@ DiskAPI.DISK_FORMATS = {
1474560: [80,2,18,,0xF0], // media type 0xF0: 80 cylinders, 2 heads (double-sided), 18 sectors/track, (2880 total sectors x 512 bytes/sector == 1474560)
2949120: [80,2,36,,0xF0], // media type 0xF0: 80 cylinders, 2 heads (double-sided), 36 sectors/track, (5760 total sectors x 512 bytes/sector == 2949120)
/*
* The following are common early hard drive sizes, which we explicitly map to CHS values, since the BPB can mislead us when attempting to calculate total cylinders
* The following are some common partition sizes, which we explicitly map to CHS values, since the MBR and/or BPB
* can mislead us when attempting to calculate total cylinders.
*/
10618368:[306,4,17], // PC XT 10Mb hard drive (type 3)
21368320:[615,4,17], // PC AT 20Mb hard drive (type 2)
/*
* Assorted DEC disk formats.
@ -164,7 +166,7 @@ DiskAPI.BPB = {
TRACK_SECS: 0x018, // 2 bytes: sectors per track (eg, 8)
TOTAL_HEADS: 0x01A, // 2 bytes: number of heads (eg, 1)
HIDDEN_SECS: 0x01C, // 4 bytes: number of hidden sectors (always 0 for non-partitioned media)
LARGE_SECS: 0x020 // 4 bytes: number of sectors if TOTAL_SECS is zero
LARGE_SECS: 0x020 // 4 bytes: number of sectors if TOTAL_SECS is zero (TODO: Verify the true extent of DOS 2.0 BPBs; they may have stopped with HIDDEN_SECS, which is what DiskDump assumes)
};
/*