This Space for Rent

Pinning together a VGA cable

I sat down with a multimeter and traced the pins on the iMac video circuit back to the motherboard, so I can make a (short) iMacga to VGA converter cable. fortunately for me it's just a simple remapping of pins and I don't have to wire together another circuit to remap levels.

Bondi blue iMac logic board
1 RED ground9 RED
2 BLUE ground10 BLUE
3 GREEN ground11 GREEN
4 N/C12 Hsync
5 Sync ground13 Vsync
6 sense 114 Sync ground
7 sense 215 Comp. Sync
8 Sync ground16 N/C

cable pinning
iMacVGA
16
28
37
510
611
712
810
91
103
112
1213
1314
1410

VGA pins 4-7 are all tied to ground (some diagrams tie them to pin 8 [Sync ground]); pins 9 & 15 are not connected; ping 12 is claimed to not be connected, but if my translation is correct here the Mac links that one to the (grounded) sense 2 pin.

I'm taking bets over whether the g3 will physically explode out of the socket when I wire up this cable and attach it to a monitor.