looking for some old RAM chips

----- Original Message ----- From: <Demon02554(a)aol.com> To: <classiccmp(a)classiccmp.org> Sent: Tuesday, April 17, 2001 6:11 PM Subject: looking for some old RAM chips Are you going for an authentic recreation, or would a functional substitution be adequate? Given how expensive and scarce 1Kx4 2114s are, 256x4s ought to be even moreso. There are inexpensive 8-bit wide SRAMs available with anything from 2Kx8 to 128Kx8, which will do the job nicely in 1 chip. One tricky thing is that the 1802 multiplexes its address output in 2 x 8 bit parts, if I read the data sheet correctly. This means you would connect only A0...A7 of the available address pins from the SRAM to the 1802 and ground the remaining address inputs. You'll "waste" all but 256 bytes but then again, memory is cheap. At least the silicon kind. :) You can demux/latch too, if you really want to toggle in more than 256 bytes! =:-O Aiiiiieeee!!!