Power / AV Pinout (Macintosh SE/30)

the header block contains the power and video pins you can power the machine from just 5v and 12v (the 12v and 5v rails are only needed for the printer, modem and pds expansion slot) the video signal is a 59 82hz vsync / 22 25khz hsync vga monochrome signal with a non standard voltage if you pass the video signal through a cleanrgb on all r, g and b inputs, tune it to output 1 4v you then have a black and white rgb signal you can feed into a receiver like the ossc the vsync and hsync are outside of spec too (about 5v signals) but often work just fine with receivers they should be 1 4v unterminated like the rgb signals and 75r load