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Seeking hp48 2MB and 4MB card schematics

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Seeking hp48 2MB and 4MB card schematics


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David Griffith Offline
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Posts: 134
Threads: 31
Joined: Oct 2011
#2
03-17-2012, 02:09 AM

I'm trying to find information on 2MB and 4MB ram cards for the HP48. Hpcalc.org 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?

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NateB Offline
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Posts: 74
Threads: 9
Joined: Jul 2010
#3
03-17-2012, 10:14 AM

You might find something useful in this document [PDF]

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