View Full Version : Macintosh IIx power and video problem

April 21st, 2010, 05:50 AM
Hi all!

I'm have Macintosh IIx computer (system case) but he don't have power adapter inside. In motherboard we have 14 pin power connector, anybody know what voltage i must connect to each contact? And this Mac don't have classic macintosh video. Some "miroGRAPH PRISMA v2.1d 2/88 miro datensysteme" videocard stay in computer. Video connector like CGA/EGA. Anybody know her pinouts? And what type of monitors she want?

April 21st, 2010, 06:01 AM
It is a 15 pin connector with pin 13 being blank (so 14 pins).

Pin Signal
1 +12v
2 +5v
3 +5v
4 +5v
5 +5v
6 +5v
7 ground
8 ground
9 ground
10 ground
11 ground
12 ground
13 unused
14 -12V
15 /PFW (power fail warning)

April 22nd, 2010, 06:16 AM
Thank you.

Maybe someone know videocard pinouts?

April 22nd, 2010, 07:04 AM
That may very well be a monochrome video card. Probably to drive a fixed scan monochrome monitor. It might be easier to find another video card - any standard Nubus video card will work.

Another thing about the Mac II series - there are two batteries on the logic board. If one or both are dead, the machine will NOT power on. A lot of people blame the power supplies when this happens.