I'd not use FRAMSs for PDP-8 as the need to write the subroutine return address at the begining of the subroutine would beat up some locations a lot. Also the write cycle does have delays while writing goes on. A better use for FRAMS is disk emulation. Lower number of write cycles but lots of reads. A few of them could easily emulate a RK05f. Even a pair of 32k SRAMS can emulate an RX08 (only faster!). One forgets that a PDP-8 system with a few megabytes of storage is a BIG 8! When you consider that SRAMS ar available to the 512kbyte range or larger and the prices are low. It's very easy to consider semiconductor disks in the megabyte range. If you resort to using DRAMS I have a pound of 30pin 1mb simms that easily could be used for a large disk simulation. Allison