I'm not at all sure what you've said here, Allison. Aren't we in agreement? The 2101 was a 1k-bit sram organized as 256x4 with separate inputs and outputs. The 2102 was a 1k-bit sram organized as 1kx1 with separate in and out. The 2112 was a 1 k-bit sram organized as 256x4 with common ins and outs. They're all different, but whoever wrote the message to which I attached mine already knew that it was a 256x4 in a 22 pin package 0.400" wide. Additionally, there was a 2115 which was a high-speed (25 ns) 1kx1 sram with open drain outputs. I saw few applications for that one, however. It had a cousin, the 2125, which had the same pinout and architecture, but had tristate outputs. Things got muddled when the iNTEL folks started using unused numbers in the 1K-bit family, e.g. 2114, for memories larger than 1k-bits. The 2114, however, was just a microcomputer-compatible (slow) version of the already widely used 2148/49, which was a fast (35-70ns) equivalent to the 2114. They also made the 2147 which had the same bit count as the 2148/49 but with a 4kx1 organization with separate input and output and pinout compatible with the much slower TMS4044. The PET 2001 was pretty early among the production microcomputers, hence may have come along too early to capitalize on the high-volume production of the 4K-bit srams. Dick -----Original Message----- From: allisonp(a)world.std.com <allisonp(a)world.std.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Tuesday, March 21, 2000 10:40 AM Subject: Re: Mos Technology RAM wanted out. not 2001 2115, typically the supply though an