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PET 2001-8 Repair: Bug in Schematic?
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Topic: PET 2001-8 Repair: Bug in Schematic? (Read 1052 times)
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NivagSwerdna
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PET 2001-8 Repair: Bug in Schematic?
«
on:
April 12, 2020, 12:21:00 pm »
I've just bought a non-working Commodore PET 2001-8
Looking at the schematics....
http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/2001/320008-2.gif
I'm trying to work out the decoding for RAM chips I2 and J2.... I think there might be an error on the schematic... specifically I think pin20 of both I2 and J2 should be nBA10?
If anyone is familiar with this bit of vintage tech I would appreciate a suggestion as to a forum where I could ask my question.
Thanks in advance
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Andy Watson
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Re: PET 2001-8 Repair: Bug in Schematic?
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Reply #1 on:
April 12, 2020, 02:18:33 pm »
I can't see a source for nBD10 on the diagram - pretty sure it's a typo. J2 is labelled correctly. Pin 20 is a positive chip-select - I would expect a positve/true BA10 to select for the range 400-7ff.
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NivagSwerdna
NivagSwerdna
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Re: PET 2001-8 Repair: Bug in Schematic?
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Reply #2 on:
April 12, 2020, 04:03:43 pm »
I'm now 99.999% sure it should be BA10.
Thanks
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