Login
Back to forumSee the full topicGo to last reply

Posted By

Hypex
on 2017-08-21
12:46:25
 Re: Possible 8501 replacement kit?

@Imperious

Yes using a BE line should be good. I've also wondered about the TTL levels. And if they match. Perhaps some looking up for any difference between MOS 6510 and WDC 6522 parallel port will help. The circuit is proven, AFAIK, for 6510 and 8502, but it is old.

Another thing, what did you do with the missing P5? I've read TTL chips don't like floating pins so if it is left at NC it can cause instability. Did you tie it to ground to keep it at zero?

Did the Spanish forum guy post any diagrams or pictures? I look forward to seeing your extra pics and docs. happy



Back to top


Copyright © Plus/4 World Team, 2001-2024