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Memoryboard Atari 520st


TXG/MNX

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You can add additional 16 pcs 1Mx1 chips (120ns or faster). But you have to deactivate the 512Kb on Board.

Connect RAS0 and CAS0x lines at Memory chip side of the internal 512Kb to +5V. Or remove the internal 512Kb.

Check if RAS0 and CAS0x from MMU side is connected to the unpopulated sockets.

 

Maximum memory for 520ST is 4MB. (without additional logic)

Edited by Lynxman
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