Search found 5 matches

by macjohnmcc
Sat Aug 03, 2013 3:23 pm
Forum: Hardware
Topic: 16K RAM Pack Schematic / Chip Layout
Replies: 71
Views: 48095

Re: 16K RAM Pack Schematic / Chip Layout

Hi there! I know that feeling (right and left are often switched :oops: ) I found that with google: http://www.zdnet.com/photos/sinclair-zx81-teardown_p51/6196518 Greetz Jens That appears to the the version I have. Good thing I was paranoid because I did put the sockets in backwards. I will just pu...
by macjohnmcc
Sat Aug 03, 2013 3:21 pm
Forum: Hardware
Topic: 16K RAM Pack Schematic / Chip Layout
Replies: 71
Views: 48095

Re: 16K RAM Pack Schematic / Chip Layout

Mine has the two boards (it says Issue 2) where the chips are folded between like a sandwich with a ribbon cable between the two boards.
by macjohnmcc
Sat Aug 03, 2013 2:22 am
Forum: Hardware
Topic: 16K RAM Pack Schematic / Chip Layout
Replies: 71
Views: 48095

Re: 16K RAM Pack Schematic / Chip Layout

Would someone be so kind as to post of a clear photo of the chip side of the board for the 16KB RAM pack with the memory chips on it? I desoldered all of the memory chips and in the process forgot where pin 1 is for the chips.

I feel like a dope. :)
by macjohnmcc
Fri May 24, 2013 7:31 pm
Forum: Hardware
Topic: Simple Video Mod for 210ULA
Replies: 19
Views: 19392

Re: Simple Video Mod for 210ULA

Thank you very much. :)
by macjohnmcc
Wed May 22, 2013 8:27 pm
Forum: Hardware
Topic: Simple Video Mod for 210ULA
Replies: 19
Views: 19392

Re: Simple Video Mod for 210ULA

Hello all. I'm new to this forum. I have previously owned a ZX80 (when it was new/current) and a ZX81. Then a long period before I wound up with a Sinclair of any flavor. I was looking for a way to modify my ZX81 (USA version) to do composite video out when I ran into this forum and this conversatio...