Login
Back to forumSee the full topicGo to last reply

Posted By

MMS
on 2017-08-09
12:29:19
 Re: Possible 8501 replacement kit?

When I told PLA replacement, I meant the PLA IC in the Plussy that can easily die too.
Certainly for a CPU replacement we need a CPU

PLA replacement project:
http://blog.tynemouthsoftware.co.uk/2015/11/commodore-64-pla-replacements.html
As far as I know the c64 uses exacly the same component.

As I know the top rootcauses of Plus/4 defect (with most frequent causes)
(just guessed figures based on diacussions, threads)
Maybe we can extend this list, how to prevent it, how to be sure it is the defect, and from where you can buy a new or used or alternative component

1) TED maybe 20-25%
Causes: joysticks with autofire, overheating

2) 8501 ~15-20%
Cause: overheating

3) Defective Roms ~20%
Cause overheating

4) defective PLA ~10%
Cause: ?

5) Defective RAMs
Cause: ?

6) with c16: defective PSU
Frequent
Cause: underpowered design, overheating



Back to top


Copyright © Plus/4 World Team, 2001-2024