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Last modified on 27 January 2010, at 09:56

Amstrad Cartridge Identification Device

Revision as of 09:56, 27 January 2010 by MacDeath (Talk | contribs)

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/