From: William Levak (wlevak_at_cyberspace.org)
Date: 2002-09-02 06:48:15
I don't know how your device works so I acn't say for sure, but there are
several differences.
On the original system board, the A000-AFFF bank is not enabled.
There are circuit differences that put a lot of snow on the screen with
Basic 4.0 in the original system board.
On Sun, 1 Sep 2002, Nicolas Welte; address is valid for replies (Re:) only! wrote:
> After my PETRAM expansion works as expected, I started to burn some ROM images
> from Funet onto EPROMs and test them in my 2001. The three ROM sets that are
> meant for this machine work fine (BASIC 1.0, BASIC 1.0 with bugfix and BASIC
> 2.0), but the BASIC 4.0 for non-CRTC machines (edit-4-n.901447-29.bin) does
> not work (garbled screen, datasette motor runs continuously). I also tested
> this ROM on VICE, and it also did not work (xpet doesn't even start). So I
> took the editor ROM from VICE and put it into an EPROM, and this one actually
> worked on my 2001, though with some strange behaviour. This might be due to
> the fact that the editor I used matches the file
> edit-4-40-n-50Hz.901498-01.bin from Funet, so it's a 50Hz CRTC editor, not the
> 60Hz non-CRTC that I actually need.
>
> I wonder if there is something in the non-CRTC editor ROM, which is probably
> made for dynamic RAM PETs, that makes it crash completely on static RAM PETs.
> After seeing that the CRTC version runs to some extent, I can't believe this.
> Maybe there is some incompatibility between the non-CRTC editor and the 4.0
> BASIC and KERNAL files? Any ideas?
>
> Nicolas
>
>
>
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>
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