1.1 KiB
| layout | title | date | category | permalink |
|---|---|---|---|---|
| post | Limited Support for XDF Diskettes | 2014-10-28 11:00:00 | Releases | /blog/2014/10/28/ |
PCjs v1.15.7 adds support for the XDF Diskette Format, which was used in PC-DOS 7.00.
However, this support is referred to as "fake" XDF support, because it requires using JSON disk images created by DiskDump without the experimental "--xdf" option, which is an option that attempts to encode XDF sectors as they existed on the original diskettes (ie, with varying lengths and non-standard sector IDs).
"Fake" XDF support works by using conventional 80-track disk images with 23 sectors/track. No standard PC floppy disk format ever used 23 sectors/track, but in this case, by distributing the XDF track data across 23 conventional 512-byte sectors, the PC-DOS 7.00 Setup code that reads XDF disks succeeds. This was probably one of several fall-back options built into the PC-DOS XDF code.
@jeffpar
October 28, 2014