# Apple II Video Expansion

15 PIN UNKNOWN CONNECTOR

Pin | Name | Description
--- | --- | ---
1 | TEXT | Video text signal from TMG; set to inverse of GR, except in double high-resolution mode.
2 | 14M | 14M master timing signal from the system oscillator.
3 | SYNC* | Displays horizontal and vertical synchronization signal from IOU pin 39.
4 | 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 | LDPS* | Video shift-register load enable from pin 12 of TMG.
7 | WNDW* | Active area display blanking; includes both horizontal and vertical blanking.
8 | +12V | Regulated +12 volts DC; can drive 300mA.
9 | PRAS* | RAM row-address strobe from TMG pin 19.
10 | GR | Graphics mode enable from IOU pin 2.
11 | 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 | VIDD7 | From 74LS374 video latch; causes half-dot shift high.
15 | CREF | Color reference signal from TMG pin 3; 3.58 MHz.

Note:
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.

Note:
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.

Contributor: Joakim Ögren

Source:
Apple Tech Info Library 1419: Apple IIc, External Pinouts at Apple TIL homepage

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2000-07-08