The CD3000XL uses standard 72 pin simm chips (our Q type simms in inventory). 2 meg stock soldered on mother board. Has two simms slots that can hold 4 or 16 meg simms. Simms can be installed in singles. Possible memory configurations are 2meg, 6 meg, 18 meg, 22 meg and 32 meg (when you install two16 meg simms you lose the 2 meg on the mother board). Also you have 2 card slots in the back of the machine that take 8 meg flash ram cards (FMX008) - 2 cards can be installed at the same time for 16 meg of flash ram (basicly ROM) samples. Fully blown machine would have 16 megs ROM samples and 32 meg sample RAM.