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1LM2-0002: HP-41C/CV/CX HalfNut System on a Chip specifications?
12-07-2015, 06:56 AM (This post was last modified: 12-07-2015 07:00 AM by quantalume.)
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RE: 1LM2-0002: HP-41C/CV/CX HalfNut System on a Chip specifications?
(12-03-2015 12:42 PM)Paul Berger (Canada) Wrote:  Here are some notes I made when working on halfnuts, there is really not much to see in both cases the ROMs are hybrids with the dies wire bonded directly to a substrate and encapsulated in epoxy.

Paul, your document shows keyboard column 0 going to pin 18 of the CPU and column 1 going to pin 19. The examples I've seen have 18 and 19 connected together and to column 0, 20 and 21 connected together and to column 1.

   
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RE: 1LM2-0002: HP-41C/CV/CX HalfNut System on a Chip specifications? - quantalume - 12-07-2015 06:56 AM



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