Re: Commodore CBM 8032-B
Posted:
Mon Jun 15, 2015 8:29 pm
by tezza
Yes, piggybacking doesn't always identify a faulty RAM chip. It depends what the fault within the RAM chip actually is. If piggybacking works a faulty RAM chip has been identified but the converse doesn't apply. The chip could still be faulty.
It's such as easy thing to do though, it's always worth a go if RAM is suspected.
Re: Commodore CBM 8032-B
Posted:
Tue Jun 16, 2015 12:10 am
by RonTurner
- Code: Select all
THE PINOUT FOR THE PET PARALLEL USER PORT
1 1 1
1 2 3 4 5 6 7 8 9 0 1 2
= = = = = = = = = = = =
### ######################### ######
= = = = = = = = = = = =
A B C D E F H J K L M N
1 - System Ground A - GND
2 - TV Video B - CA1
3 - IEEE-SRQ C - PB0
4 - IEEE-EOI D - PB1
5 - Diagnostic Sense E - PB2
6 - Cass.1 Read F - PB3
7 - Cass.2 Read H - PB4
8 - Diag Tape Wrt. J - PB5
9 - TV Vertical K - PB6
10 - TV Horizontal L - PB7
11 - GND M - PA2 (CB2)
12 - GND N - GND
Looks like H-Sync and V-Sync and Video signal are available at the User Port, doesn't this mean I can wire up one of my RGB monitors ? I'm willing to give it a go
its TTL level so its safe.
Re: Commodore CBM 8032-B
Posted:
Wed Oct 21, 2015 7:18 am
by nzswift
How you getting on with this???? Still want some old mother boards?