Difference between revisions of "Amstrad Cartridge Identification Device"
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Revision as of 11:26, 27 January 2010
ACID protection chip within a cartridge (bottom)
The ACID (Amstrad Cartridge Identification Device) protection chip is used in the cartridges of the Plus series and the GX4000 game console. Because this chip was a custom creation by Amstrad it is currently not possible to replace this chip nor to build new cartridges, because it is not known how it works. It is labelled with "Amstrad 40908".
Pinout
+--()--+
GND | 1 16| +5V
A7 | 2 15| A6
CLK4| 3 14| A5
NC | 4 13| A4
CCLR| 5 12| A3
SIN | 6 11| A2
|CE | 7 10| A1
GND | 8 9| A0
+------+
| Pin number | Name | Direction | Description |
| 1 | GND | - | Ground |
| 2 | A7 | Input | Address A7 |
| 3 | CLK4 | Input | Clock (4 MHz) |
| 4 | NC | - | Not connected |
| 5 | CCLR | ? | ? |
| 6 | SIN | ? | ? |
| 7 | /CE | Input | Chip enable |
| 8 | GND | - | Ground |
| 9 | A0 | Input | Address A0 |
| 10 | A1 | Input | Address A1 |
| 11 | A2 | Input | Address A2 |
| 12 | A3 | Input | Address A3 |
| 13 | A4 | Input | Address A4 |
| 14 | A5 | Input | Address A5 |
| 15 | A6 | Input | Address A6 |
| 16 | +5V | - | Vcc |
Investigation (Spanish language): http://amstradcpc.mforos.com/305097/7723493-que-hace-exactamente-el-chip-acid-de-los-cartuchos/
