Connector - Apple II Video Expansion

15 PIN UNKNOWN CONNECTOR
PinNameDescription
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.

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.

Source: HW-Book 2001-06-08
Last modified: 2007-06-27 14:22:45.0
Aus rechtlichen Gründen kann ich leider keinelei Garantie für die Angaben übernehmen.
0.0s
File last modified 2024-02-15 23:07:43 Karate | Webmail | Could | Privat | Firma | Imkern | HW | Admin | Domains