I made three collective orders at a1k.org. The 2007 Version works really good, is easy to solder and there is also a firmware for 4MB. With the 4MB firmware PCMCIA is still working!
For me it's the perfekt A600 RAM-Expansion. One expansion with 4MB costs ~26€, 8MB was ~32€, pending on ordered PCBs and the price of the RAM ICs.
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