Tony Cianfaglione wrote: > Could someone please post the pinouts for the raw signal port (db15) RGB > on a IIc? Don't call it an RGB port, because it isn't one. It is the "Video Expansion Connector". Here is the pinout (courtesy of IIc technical reference manual, which happened to be on top of the pile within arm's reach): 1 TEXT 9 PRAS* 2 14M 10 GR 3 SYNC* 11 SEROUT* 4 SEGB 12 NTSC 5 1VSOUND 13 GND 6 LDPS* 14 VIDD7 7 WNDW* 15 CREF 8 +12V The various signals are video mode, clocks, etc. An asterisk indicates an active low signal. Assuming you need a little more detail, here are the descriptions from the table immediately after the diagram. If you need yet more information, I'd suggest getting the technical reference manual (or Understanding the IIe). Pin Deriv Name Description 1 Phi0 TEXT Video text signal from TMG; set to inverse of GR, except in double-high-resolution mode 2 14M 14 MHz master timing signal from system oscillator 3 Q3 SYNC* Displays horizontal and vertical synchronization signal from IOU pin 39 4 PRAS SEGB Displays vertical counter bit from IOU pin 4; in text mode indicates second low-order vertical counter; in graphics mode indicates low-resolution 5 1VSOUND One-volt sound signal from pin 5 of the audio hybrid circuit (AUD) 6 14M LDPS* Video shift-register load enable from pin 12 of TMG 7 PRAS WNDW* Active area display blanking; includes both horizontal and vertical blanking 8 +12V Regulated +12 volts DC; can drive 300 mA 9 14M PRAS* RAM row-address strobe from TMG pin 19 10 PRAS GR Graphics mode enable from IOU pin 2 11 14M SEROUT* Serialized character-generator output from pin 1 of the 74LS166 shift register 12 NTSC Composite NTSC video signal from VID hybrid chip 13 GND Ground reference and supply 14 Phi0 VIDD7 From 74LS374 video latch; causes half-dot shift if high 15 14M CREF Color reference signal from TMG pin 3; 3.58 MHz (All of the above assumes an NTSC IIc. A PAL one presumably has appropriate changes, such as a different colour reference frequency, slightly different 14M frequency, etc.) Note that the NTSC pin is the same as the composite video output, but has different load characteristics (it is generated in parallel by a video output chip called VID, and is missing a series inductor and capacitor to ground). The "VID" chip takes SEROUT*, SYNC*, CREF* and CLRGAT* as inputs, producing NTSC and the composite video output. (CLRGAT* is an output from the IOU.)