7800 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. Back (c) 1998-2004 Jindroush Last modified: Mon Jan 13 12:32:48 2003