Not sure about the gold color... LDOS rocks but a gold trim? 🤔

#TRS80 #ModelIII #LDOS #Bling

I've got a .DSK file, 377344 (0x5c200) bytes in size, and likely bearing an LDOS filesystem, for an unidentified machine in the TRS-80 series, in that it carries this signature:

00002ad0 4c 44 4f 53 2d 35 31 33 30 39 2f 32 39 2f 38 36 |LDOS-51309/29/86|

What is the disk image's likely geometry, or what kind of ready tool might let me extract files from it?

file guesses that the image is TTComp archive data, binary, 4K dictionary, but it does not seem to be compressed, in that gzip can readily compress it by over 50%. The beginning of the file is consistent with a long array of three-byte values, which I surmise might be what LDOS's 'GAT' might look like.

I don't particularly care to emulate what's on this disk; I'll be quite happy if I can extract the binary and run it through a disassembler.

Unfortunately, I'm not familiar with TRS-80, and the disk size does not even suggest an obvious geometry to me; while I know that TRS-80 disk drives typically used 256-byte sector (payload) sizes, 1474 sectors factors into 2*11*67, which seems rather weird for a disk geometry.

#retrocomputing #trs80 #ldos