After truncating them to exactly 140K CiderPress confirms they are ProDOS in ProDOS order. The ProDOS images both have a bunch of junk at the end. The DOS 3.3 images are in ProDOS format as confirmed by opening them with CiderPress.
UPDATE: I found the distro archive with the disk images and added the link. po for this format, or which emulator first used the DOS 3.3 sector ordering format. Now it could be that there was an even earlier Apple 2 emulator and I don't yet know which emulator or tool first used the file extensions. S6d2 yes DOS 3.3 slot 6 drive 2 disk arch The emulator was distributed with a pair of disk images for each disk operating system named as so: s6d1 yes DOS 3.3 slot 6 drive 1 disk arch It seems this emulator did now allow loading and saving arbitrary disk files yet, so it did not use the. PRODOS UNIX files are just a block by block binary dump of the data The format you get by reading a DOS 3.3 disk with the PRODOS block So theįirst 256 bytes are t0s0 but the second are t0se. The Apple II 16 sector disk was the floppy-disk format for the Apple II computer line starting with DOS 3.3, superseding the Apple II 13 sector disk used in DOS 3.2.1 and earlier.
Instead the DOS 3.3 files are in PRODOS interleave format. However, the files are not in straight t0s0,t0s1,t0s2. Note: the UNIX files contain all the data on a DOS 3.3 5.25 disk. It used ProDOS order for both ProDOS and DOS 3.3 disk images! This answer is still a work in progress.Ī Unix emulator named "Apple //e Emulator" by Randy Frank (aka "apple2e" or just "ap2e" in filenames) goes right back to 1990.
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