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512 KB SRAM (Alliance AS6C4008-55PCN or BSI BS62LV4006PC) |
x 1 | |
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Lattice GAL 22V10D-25LP |
x 1 | |
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4K7 8+1 (RESISTOR ARRAY) |
x 1 | |
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100 nF Polyester Capacitor |
x 2 | |
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40 PIN DIP SOCKET |
x 2 | |
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20 PIN DIP SOCKET |
x 1 | |
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24 PIN DIP SOCKET |
x 1 | |
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2 PIN JUMPER |
x 2 | |
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3 PIN JUMPER |
x 2 | |
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HEADER |
x 100 | |
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DUPONT CABLE |
x 3 |
ATARI 800XL 512 KB RAM CARD
With this circuit, your Atari 800 XL computer will have 512 KB of additional RAM that is Rambo/Compy compatible. Thanks to the additional RAM, you will have the opportunity to use new generation games and demos that require extra RAM on your Atari 800 XL computer.
The original design belongs to Matthias Reichl (https://www.horus.com/~hias/atari/), I thank him for this wonderful project. I redrew the original design so that it could be mounted on the Atari 800 XL. The circuit consists of two separate parts: RAM card and MMU connection card. During PCB production, the two will be produced combined. You will break the MMU card from the RAM card and use it.
Assembly:
Disassemble SALLY, disassemble PIA, disassemble POKEY, Disassemble the MMU chip. Replace the RAM card in the old location of SALLY and PIA. Replace the MMU card and connect the RAM card and MMU card with a dupont cable. (I added the assembly pictures.)
NOTE: Unfortunately, since the keyboard cover does not close, it is necessary to solder the POKEY chip and 512 KB RAM card to the ATARI PCB without a socket. If you want, you can make the MMU card socketed.
512 KB RAM Card Jumper Modes:
J1 J2 Mode
Open Open ext RAM Off
Open Closed 256 KB ANTIC access
Closed Open 256 KB
Closed Closed 512 KB
ATARI 800XL 512 KB RAM CARD
*PCBWay community is a sharing platform. We are not responsible for any design issues and parameter issues (board thickness, surface finish, etc.) you choose.
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