The IIci has two banks of DRAM. Bank A is also used as video buffer. Bank A is the right one, means the bank directed to harddisk and floppy. Bank A must be populated.

There are two logic boards, one uses parity, the other does not. In the front left corner there is a chip (or foot print) called "PGC" on position "UM3" near RESET switch. If this IC is installed than you must use parity SIMMs. Otherwise you can use standard SIMMs or parity SIMMs.

16MB SIMMs are ok. 80nsec or less.