RE: expanding a CBM 610 to 256k

> The original 8088 card on a 610 is unreliable due to /RAS and /CAS signal interference
> and the results varies significantly from one mainboard to another. They way of
> preparing the boot disk will not make a difference here.

Michał and I recreated the card and added some enhancements:
- 64 KB of ROM
- using the well available 8255 instead of the rare 6525
Michał then managed to dump MS-DOS 3.2 into the EPROM, 3.30 was a bit too big, and things ran fine, both on a 610 and 720. He expanded the card much further but it is to him to explain that.

I do have Eagle schematic and board files so Gerber files can be created. But Michał has a vote in this as well and may be has better options. Michał?


With kind regards / Met vriendelijke groet, Ruud Baltissen

http://www.baltissen.org









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