Apple II Video Expansion connector

#Computer#Videocards connectors#Apple
15 pin D-SUB MALE connector pin-out & layout

15 pin D-SUB MALE connector  at the Apple computer, looking into cable-side connector

1TEXTVideo text signal from TMG; set to inverse of GR, except in double high-resolution mode.
214M14M master timing signal from the system oscillator.
3SYNC*Displays horizontal and vertical synchronization signal from IOU pin 39.
4SEGBDisplays vertical counter bit from IOU pin 4; in text mode, indicates second low-order vertical counter; in graphics mode, indicates low-resolution.
51VSOUNDOne-volt sound signal from pin 5 of the audio hybrid circuit (AUD).
6LDPS*Video shift-register load enable from pin 12 of TMG.
7WNDW*Active area display blanking; includes both horizontal and vertical blanking.
8+12VRegulated +12 volts DC; can drive 300mA.
9PRAS*RAM row-address strobe from TMG pin 19.
10GRGraphics mode enable from IOU pin 2.
11SEROUT*Serialized character generator output from pin 1 of the 74LS166 shift register.
12NTSCComposite NTSC video signal from VID hybrid chip.
13GNDGround reference and supply.
14VIDD7From 74LS374 video latch; causes half-dot shift high.
15CREFColor reference signal from TMG pin 3; 3.58 MHz.

The signals at the DB-15 on the Apple IIc are not the same as those at the DB-15 end of the Apple III, Apple IIGS, and Macintosh II. Do not attempt to plug a cable intended for one into the other.

Several of these signals, such as the 14 MHz, must be buffered within about 4 inches of the back panel connector–preferably inside a container directly connected to the back panel.

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