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Grex Micros Item 146: Info on Mac High Res. display card needed.
Entered by n8nxf on Tue Jun 25 13:42:38 UTC 1996:

I am resurecting a Mac IIcx.  All I need now is a monitor.  It came
with a High resolution display card.  Can someone tell me what the
pinout is on the DB-15 connector?  I'm going to try to connect it to a
standard VGA monitor.  I know it'll drive a 640 X 480 display, but I'm
not sure of the vertical frequency.  I'm also aware that I may have to
invert some of the signals in order for this to work.  Any suggestions
or information would be great!

2 responses total.

#1 of 2 by ajax on Tue Jun 25 17:01:51 1996:

From _The Programmer's Apple Mac Sourcebook_:
 
   4.67 Macintosh II Video Card Pinouts
 
   Pin #   Signal Name  Signal Description
   1       GND          Ground
   2       RED          Red color signal
   3       /CSYNCH      Synchronization
   4       GND          Ground
   5       GREEN        Green color signal
   6       GND          Ground
   7       NC           No connection
   8       NC           No connection
   9       BLUE         Blue color signal
   10      NC           No connection
   11      GND          Ground
   12      NC           No connection
   13      GND          Ground
   14      GND          Ground
   15      NC           No connection
 
   Notes:  * Signals are for analog monitor
           * Connector is DB-15 socket
   Source: Designing Cards and Drivers for the Macintosh II
           and Macintosh SE

#2 of 2 by n8nxf on Wed Jun 26 14:26:49 1996:

Thank you Rob!  Interesting.  It looks as though horizontal and vertical
sync are combined on the Mac output.  PC monitors require separate H and
V sync signals.  Time to dig up some sync serarator circuits.... After I
look at it with a scope.  I'll also have to figure out the diff. between
digital and analog monitors.

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