SS/80 Exerciser

[Martin Hepperle]

(08-03-2017 02:19 AM)magore Wrote:  FYI: here is the full sector map listing - cyl 15 is missing a sector
(I will update the code to report missing sectors)
cyl: 0,hd:0 map: 0 4 8 12 1 5 9 13 2 6 10 14 3 7 11 15
...
cyl:13,hd:0 map: 1 2 3 4 5 6 7 8 9 10 11 0 12 13 14 15
cyl:14,hd:0 map: 12 0 4 8 13 1 5 9 14 2 6 10 15 3 7 11
cyl:15,hd:0 map: 5 9 13 1 6 10 14 2 7 11 3 8 12 0 4
...

Mike,

thank you for your interesting work.

I would have expected an interleave of 4 for all tracks, but some (#13) are weird.
My analysis of the LIF image shows that one sector is missing after file offset 0xFA00. 0xFA00 is 64000d which is 240d sectors resp. 15 tracks and 10 sectors.

Now: 15 good tracks means tracks #0...#14. In track #15 there are 10 good sectors (#0...#9) and #10 is missing. In your list #10 occurs but #15 is missing. So #10 should be #11, etc. up to #14 would become #15.

There is probably no automagic way to fix such problems, but it would be important that a conversion software shows inconsistencies to the user and if odd sector numbers occur (e.g. 116) they should never be thrown out but saved to extra files (e.g. track#-sector#.lif). Thus one could at least inspect them and as a last resort patch into the LIF image by hand hex-editor)
Martin