Apple II Video Expansion connector
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15 pin D-SUB MALE connector at the computer (male or female) ?
||Video text signal from TMG; set to inverse of GR, except in double high-resolution mode.
||14M master timing signal from the system oscillator.
||Displays horizontal and vertical synchronization signal from IOU pin 39.
||Displays vertical counter bit from IOU pin 4; in text mode, indicates second low-order vertical counter; in graphics mode, indicates low-resolution.
||One-volt sound signal from pin 5 of the audio hybrid circuit (AUD).
||Video shift-register load enable from pin 12 of TMG.
||Active area display blanking; includes both horizontal and vertical blanking.
||Regulated +12 volts DC; can drive 300mA.
||RAM row-address strobe from TMG pin 19.
||Graphics mode enable from IOU pin 2.
||Serialized character generator output from pin 1 of the 74LS166 shift register.
||Composite NTSC video signal from VID hybrid chip.
||Ground reference and supply.
||From 74LS374 video latch; causes half-dot shift high.
||Color 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.
Источник: Apple Tech Info Library 1419: Apple IIc, External Pinouts at Apple TIL homepage