GITHUB: https://github.com/agranlund/STRam

Important

The board needs fixing with a bodge wire

Atari 520ST(M)

4MB RAM Expansion

Tested on C070243 Rev.I , your mileage may vary.

Important

The board needs fixing with a bodge wire

The expansion board must be installed

directly onto the motherboard.

Using sockets won't leave enough

clearance for the keyboard

BOM

Qty Component Value Size Package

C1 - C6 100nF 0805

R1 - R2 68Ω 0805

R3 33Ω 0805

2x 5118160 DRAM SOJ42

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

The CAS & RAS pins can be soldered to on the

underside of the motherboard as well as,

on some boards, on the topside as well.

NameMMU PinRAS118CAS1L21CAS1H22MAD964