GS-RAM Plus
Up to 6 MEG on one card in 1 MEG increments. A fully expanded GS-RAM Plus operates at only 270 ma for extremely low power consumption. With an optional 2 MEG piggyback card, GS-RAM Plus can be expanded to 8 MEG, and is fully DMA (direct memory access) compatible.
Manuals & files
Opens on ae.applearchives.com (not rehosted here).
Source page: https://ae.applearchives.com/apple_iigs/gs_ram_plus/