Seeking hp48 2MB and 4MB card schematics


I'm trying to find information on 2MB and 4MB ram cards for the HP48. has info on making a 128k card and something on making a 1MB board / soundcard combo... So I seem to have the info to make these cards. Does anyone here understand the 1MB board well enought to walk me through what needs to be done to create a 4MB board?


You might find something useful in this document [PDF]

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