7800 Expansion

expansion

1 gnd

2 +5V

3 CVIDEO composite video signal

4 MLUM0 Maria luminance bit0

5 MLUM3

6 BLANK Blanking output

7 OSCDIS Disables internal clock, uses EXTOSC

8 EXTMEN External Maria enable

9 GND

10 EXTOSC External oscillator

11 CLK2 Phase 2 clock from cpu

12 MSYNC Sync output

13 MLUM1

14 MLUM2

15 MCOL Color output

16 RDY RDY input to the 6502

17 AUDIO TIA audio output

18 GND

Description

This port was originally designed for a laserdisc add-on for games like Dragon's Lair. It was never used by Atari and was later completely abandoned, and it's not present on any newer console.

1	gnd
2	+5V
3	CVIDEO	composite video signal
4	MLUM0	Maria luminance bit0
5	MLUM3
6	BLANK	Blanking output
7	OSCDIS	Disables internal clock, uses EXTOSC
8	EXTMEN	External Maria enable
9	GND
10	EXTOSC	External oscillator
11	CLK2	Phase 2 clock from cpu
12	MSYNC	Sync output
13	MLUM1
14	MLUM2
15	MCOL	Color output
16	RDY	RDY input to the 6502
17	AUDIO	TIA audio output
18	GND