Re: 'Frankenstein' Disk Drives, Done Cheap

On 04/22/2014 08:51 PM, Rob Eaglestone wrote:
> The fellow with the two 1541-II drives made me start wondering about
> putting the 1541 on a chip (for those of us who are more Computer
> Science and less Electrical Engineering) and cheaply (for those of us
> who are cheap).  I started with:
>
>     Makes me wonder what it would take to put most of the 1541 logic onto a
>     FPGA or CPLD... using SystemVerilog, for example.
>
>     (And is my mentioning that considered a proof of my insanity?)
>
>
> ...to which Garrit replied:
>
>     Once you have the two 6522, the 6502 and the RAM/ROM taken care of,
>     the rest is not that complicated. Besides the analog part of course,
>     you'll probably have to keep that analog.
>
>
> While he was tying that response, I had ran off to Google to see if
> anything had been done with Arduino, rather than CPLDs, and I came up
> with this:
>
> http://awesome.commodore.me/1541-arduino-uno/
>
> Looks like it's a young project, but it's interesting.

There are other such things like the SD2IEC or the 1541U. The problem 
is, in order to be fully compatible with the 1541 you need the mechanics 
of a 1541 and a logic that can run 6502 code cycle exact and have the 
6522 at the right places. Otherwise code downloaded into the emulator 
will not run. Meaning about all software speeders.

  Gerrit





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