Atari 520 ST(M) 4MB Memory Upgrade/Expansion
Originally Designed By Anders Granlund from Sweden....
I've re-routed the PCB to fix the need for a bodge wire and updated the Silkscreen.
Tested on C070243 Rev.I ...
### Important ###
The expansion board **MUST** be installed directly onto the motherboard.
Using sockets **WILL NOT** leave enough clearance for the keyboard!
Parts List...
C1 to C6 | 100nF | 0805 | x6
R1 + R2 | 68Ω | 0805 | x2
R3 | 33Ω | 0805 | x1
NN5118160AJ DRAM | SOJ42 | x2
Installation
- De-solder the existing RAM.
- Solder the expansion board in place.
- Solder the four wires from the expansion board to the motherboard.
Signals: **MAD9**, **CAS1L**, **CAS1H**, **RAS1**
**MAD9** can usually only be found on the **MMU**
Routing the MAD9 Signal through a SPDT switch with one side to ground will allow switching between 1MB and 4MB...
MMU Pin
RAS1 | 18
CAS1L | 21
CAS1H | 22
MAD9 | 64
Atari 520 ST(M) 4MB Memory Upgrade/Expansion
*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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