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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 assy no. 250455 and 310163. Does anybody know what is CR21, CR22, CR23 and CR24 on the assy no. 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) 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 These may not be the serial protection diodes mentioned in Commodore techtopic issue 6, 1985 : Computer 1 Model: C-64, C-16, PLUS 4 Thanks for you help.
I would guess they were
I would guess they were protection diodes also. I assume that you looked on Zimmers for the exact schematic.
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