Posted By
IstvanV
on 2007-07-23
09:06:03
|  Re: plus4emu 1.2.0 beta
Yes, I know that this model is not as well supported as the MPS-801 or MPS-803. The reason why I emulate it is that the 1526/MPS-802 is the only one for which I have found schematics, firmware, and full, commented assembly sources of firmware so far, making the implementation the easiest. For the other models, I could not find as much information, and some of them also seem to use a non-6502 compatible CPU.
Nevertheless, I may have a try at the MPS-803 later, if I can find sufficient information.
The MPS803 Expansion indeed does not work at all when using the original 1526 ROM. However, I was able to get this output when using a custom ROM that adds support for printing graphics:
http://www.sharemation.com/IstvanV/printer1.png
the modified ROM is in this package:
http://www.cbmhardware.de/dlmanager/download.php?id=228
Note that I used a font converted from the Plus/4 screen font, since the expansion download did not include a font (or maybe I just did not find it):
http://www.sharemation.com/IstvanV/testfont
By the way, when printing text, the even and odd rows seem to be off by one pixel horizontally. Is this normal, or a bug in the emulation that should be fixed ? Here is a picture:
http://www.sharemation.com/IstvanV/printer2.png
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