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Posted By

au-chadl
on 2017-12-16
20:05:03
 Commodore plus 4 assy no 250455

Does anybody have a schematic diagram for the Commodore Plus 4 assy no 250455.

There are a few minor differences between 250455 and 310163.

Does anybody know what is CR21, CR22, CR23 and CR24 on the 250455 are. These are 4 diodes.

The CR21 and CR22 diodes, do not have any markings, except for a yellow band.

CR23 and CR24 diodes, do not have any markings, except for 2 purple? coloured bands.


The CR21 and CR22 diodes are located behind CN2 (serial port)

The CR23 and CR24 diodes are located near sw2 (reset switch)

CR22 looks like it is connected to the serial port.

CR21, CR22, CR23 and CR24 are not used in assy no. 310163

The Plus 4 service manual only has the parts list and schematic diagram for the 310163

Thanks for you help.

Posted By

JamesC
on 2017-12-16
23:38:53
 Re: Commodore plus 4 assy no 250455

Take a look here:
http://www.oldcomputers.it/parts/commodore/1541/docs/devil/Computers/Commodore/Techtopics/1985-6/index.htm

Posted By

au-chadl
on 2017-12-17
13:52:57
 Re: Commodore plus 4 assy no 250455

I have already had a look there.

That is why i posted the message, asking the question.



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