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
Project images are for reference only. Actual production is based on the manufacturing files on the project page.
Please review the designer's notes (e.g., PCB thickness) and select the appropriate options.
PCBWay is not responsible
for issues caused by unsuitable parameter selections.
For more important ordering information, please refer to
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