Re: Format sequence
Date: 2006-05-27 21:54:45

Hallo allemaal,

I have my 1541LPT project working :) It hasn't been fully fool proof tested 

but it works. I can format a 'disk', save and load a one-liner and read the 

directory. And IMHO the rest should work as well as in fact I only altered 
the parts that are involved with writing to or reading from the floppy-

Some technical information:
- one only needs to add a 6522 to the board and solder a 25 pin D-connector 

to the 6522.
- I mentioned adding extra 2 KB of SRAM but you can forget that. At this 
very moment I'm only using TWO bytes of that RAM and IMHO it shouldn't be 
difficult to find a home for them in the first 2 KB. 
- At this moment the extra ROM part is 778 bytes big. The original format 
routine alone needs about 640 bytes and so, together with the unused 256 
bytes at $C000, I could squeeze it in the original ROM. But that would mean 

no extra commands at this moment like "changing disk".
- The PC runs a little Pascal program. At this moment it loads an hardcoded 

D64 image. It is not much trouble to alter so it will use a parameter to 
tell it what disk to use. There is a way to tell the 1541 that the PC has 
'stopped' and started again. In this case the 1541 will reset as well.

- I first will optimize what I have at this moment. 
- Add some extra commands like 'change disk'
- Maybe using G64
- Find out if I can find a place for all the routines inside the original 
- Making a JiffyDOS version. FYI, the only part that my program affects is 
the format routine.

   / __|__
  / /  |_/     Groetjes, Ruud
  \ \__|_\

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