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Nick Andrew - TRS80 - Disk Utilities

Disk Utilities

This package contains programs which work directly with diskettes.

My disk subsystem was initially a standard single-density System-80 one. I guess this meant it was memory-mapped just like the TRS-80 one. For once Dick Smith decided against a trivial hardware change which ruined compatibility with the TRS-80 Model 1 ... so thankfully all OSs and disk-using programs written for the Model 1 worked fine on the System-80.

I tried to get Double Density by adding a suitable controller. The original controller was the Western Digital WD-1771. I tried adding the WD-1790 (I think that was its designation) which is supposed to be able to do Double Density, at the expense of not being able to handle 2 of the 4 Data Address Marks which the 1771 could make.

After some trouble getting my hardware and software working I had single density working with the WD-1790, but double density just didn't work somehow. So I bit the bullet and bought a "commercial" Double Density adapter board made by Errol Rosser (see http://www.cia.com.au/rcsradio/sydtrug.htm). Errol's board required the original Single Density controller to plug into a socket on the board. It then switched between controllers, using the Double Density controller only for Double Density work. This preserved compatibility with the 4 Data Address Marks.

Oh yes, the programs ... I have no idea what most of them do. The code looks like a lot of them were written around the same time.

duplicat
The purpose of this program is clear, at least. It's a special purpose program to copy the Micro$oft Adventure from its original (supposedly "copy-protected") disk. The Original Adventure was written to a specially formatted disk where the sectors were numbered 127, 125, 123, etc... and so were the tracks. Or something like that. All this was a great deal of fun to figure out, and even more fun to figure out how to copy it successfully. I had to write a special FORMAT program, which is in this directory also.

I also wrote a copier which writes to a standard format diskette. It just made a lot of sense to cut out the stupid copy protection. I have the required patch to the program itself, somewhere.

trk
I guess it's a track-by-track copy program ?
write
The comment on this one says it duplicates whole diskette contents, and the code is very similar to trk.

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