Re: ZoomFloppy - formatting a disk in a 2031 disk drive

Den Fri, 11 May 2018 14:55:02 +0200 skrev And Fachat <afachat@gmx.de>:
> Am 11. Mai 2018 14:36:55 schrieb Mia Magnusson <mia@plea.se>:
> 
> >> But back to the 2031 problem, IIRC I had no problems running my
> >> XD2031 firmware tests with all IEEE drives _but_ the 2031 in VICE.
> >> That were a lot of factors - emulation, my test cases etc but my
> >> preliminary conclusion was to actually decide there is some
> >> difference in the 2031 that breaks the usual drive-related code.
> >> IIRC it was doubted here and I understand it, I would have doubted
> >> this conclusion from someone else either I guess. Due to time
> >> constraints I decided not to investigate further, just see this
> >> discussion ringing a bell here
> >
> > Are there any people around who has made the german magazine 64er
> > modification for a 1541 to become a 2031lp?
> 
> Yes in fact I have made it. Never had any problems. But the 64er
> modified the ROMs such that they only changed the 1541 IEC routines
> to IEEE, but not all of the ROMs. So it is more of a modified 1541.

Interesting. I had thought that the ROMs were more or less the same.

> > Or do we even know if this problem only affects the "high profile"
> > 2031 or does it also affect the 2031lp (1541 style case)?
> 
> I now do have a 2031lp but not much time right now. So I haven't
> checked it.
> 
> > Btw it would be nice to make a 2.0 version of this mod which
> > includes the ability to switch back to 1541 mode.
> 
> Indeed.

This leads to the question: How many versions of the 1541 PCB are
there? And how do they differ regarding the placement of the relevant
IC's?

If memory and ports should be modified on a 1541, it might aswell
contain the hardware neccesary for running some of the classic
parallell cable speeders too.

Btw 64er also had a DIY project for adding 40k RAM/EPROM to a 1541,
using 6264 SRAM / 2764 EPROM's, with the ability to mode 16k to the ROM
area to have RAM or EPROM instead of ROM, to run any firmware version.


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