IIRC the 8355 was the mask-progeammed part, so it's not suprising you don't have any of those, If you did, they proably wouldn't contain the code you wanted :-). The 8755 was the EPROM part, and at least one version had a quartz windo for erasure (I don't know if there was an OTP type). The 8155 was RAM. All had I/O as well. There's also the 8156, which is the same as the 8155 (RAM + I/O) but with an active-high chip select. Not as common as the 8155. Of course you can use normal RAM and EPROM with the 8085 is you add and address latch. An 74x373, or the 74x573 which as a saner pinout, is a common choice. -tony