Posted By
siz
on 2018-06-01
16:22:48
|  Re: Terra Nova on Sextett Compilation buggy?
@gerliczer
>What do these programs do then
These are a bit different because they do not extend a disk to 40/41 tracks with a single directory. They add a second 5/6 track disk from track 36. They move the head to track 35, step one more track and tell the drive that the head is on track 18. They format this second disk to have only these tracks free (19-22/23). When you want to go back to the "normal" disk they just bump the head to track 1.
This way you could expand the capacity of the disk with a stock drive, you don't need a special ROM to handle more thank 35 tracks.
I used this method back then and even wrote some USR programs (&HI and &LO) which could be executed by the drive directly and did the switch between the two disk parts.
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