1.4 KiB
Disk: Acorn ADFS
Acorn ADFS disks are pretty standard MFM encoded IBM scheme disks, although with different sector sizes and with the 0-based sector identifiers rather than 1-based sector identifiers. The index hole is ignored and sectors are written whereever, requiring FluxEngine to do two revolutions to read a disk.
There are various different kinds, which should all work out of the box. Tested ones are:
- ADFS L: 80 track, 16 sector, 2 sides, 256 bytes per sector == 640kB.
- ADFE D/E: 80 track, 5 sector, 2 sides, 1024 bytes per sector == 800kB.
- ADFS F: 80 track, 10 sector, 2 sides, 1024 bytes per sector == 1600kB.
I expect the others to work, but haven't tried them; get in
touch if you have any
news. For ADFS S (single sided 40 track) you'll want -s :s=0:t=0-79x2. For
ADFS M (single sided 80 track) you'll want -s :s=0.
Be aware that Acorn logical block numbering goes all the way up side 0 and then all the way up side 1. However, FluxEngine uses traditional disk images with alternating sides, with the blocks from track 0 side 0 then track 0 side 1 then track 1 side 0 etc. Most Acorn emulators will use both formats, but they might require nudging as the side order can't be reliably autodetected.
Reading discs
Just do:
fluxengine read adfs
You should end up with an adfs.img of the appropriate size for your disk
format.