AY-3-8500
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The AY-3-8500 is a chip playing several Pong variants on a domestic television receiver, released by General Instrument in 1976 and became available to any manufacturer. The circuit is intended to be battery powered and a minimum number of external components are required to complete the system.
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[edit] Games
Six selectable games for one or two players are included:
| Game | Number of players |
|---|---|
| tennis | 2 |
| soccer | 2 |
| squash | 2 |
| practice | 1 |
| rifle game 1 | 1 |
| rifle game 2 | 2 |
In addition, a seventh undocumented game can be played when none of the previous six is selected: Handicap, a soccer variant where the player on the right has a third paddle. On very few systems this game is implemented.
[edit] Usage
The AY-3-8500 is packaged in a 28 lead dual in line housing. The connection of the pins is as follows:
| Nr. | Name | Purpose |
|---|---|---|
| 1 | NC | Not connected |
| 2 | Vss | Ground |
| 3 | Sound output | |
| 4 | Vcc | Positive supply voltage which must be between 6 and 7 V |
| 5 | Ball angles | |
| 6 | Ball output | |
| 7 | Ball speed | |
| 8 | Manual serve | |
| 9 | Right player output | |
| 10 | Left player output | |
| 11 | Right bat input | |
| 12 | Left bat input | |
| 13 | Bat size | |
| 14 | NC | Not connected |
| 15 | NC | Not connected |
| 16 | Sync output | |
| 17 | Clock input | |
| 18 | Rifle game 1 | |
| 19 | Rifle game 2 | |
| 20 | Tennis | |
| 21 | Soccer | |
| 22 | Squash | |
| 23 | Practice | |
| 24 | Score and field output | |
| 25 | Reset input | |
| 26 | Shot input | |
| 27 | Hit input | |
| 28 | NC | Not connected |
[edit] Consoles
Consoles based on AY-3-8500 are:
- Coleco Telstar
- Magnavox Odyssey (300, 2000 and 3000)
- Radio Shack TV ScoreBoard
[edit] Deratives
An equivalent to the AY-3-8500 is the TMS1965NLA manufactured by Texas Instruments.
