A604 RAM Expansion 1 MB for Amiga 600 (upgrades the A600 to 2 MB ChipMem) clock ports

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Ummm... In a stock A600 the 68000 CPU has only 24-bit addressing.  You'd need an accelerator card to fix that.

however, superior communist technology designed by russian comrade NedoPC allows you to add a whopping 8MB of fastram (or 5.5MB keeping PCMCIA)!