For the emulator the type doesn't matter, they are code compatible. But 20+ years hence, on the project, I've used both types At first only SC/MP I was aviable but I blew one of the flags so I switched to SC/MP II later. The Elektor project came in two versions. One with binary toggles (dip-switches) and led's, and a second with a hexadecimal keyboard and 7-segments display and a monitor in ROM called "ELBUG" I've made both projects but lost the latter (gave it away 18y ago) when it died on me. :-( The first project was used by some friends of my for a while to make light-effects in a disco (~15 years ago). I still have the first project board and it was ECO-ed to a SC/MP II version. However it is in a terrible state now and needs to be fixed-up a bit. The emulator copies the first (binary sw.+ led) version. If you are interested in the "alpha version" of the emulator let me know. It still has problems but it works. My goal is to get it fully running by April 2001 because that will be the 25th aniversary of the SC/MP chip It's written in VisalBasic 6.0 so you'll need the VB6 runtimes as well. I'm working on the doc's right now but thats in dutch and won't do you any good I guess. Allthoug the opcode-matrix and opcode tables may be helpfull. Sipke de Wal ----- Original Message ----- From: ajp166 <ajp166(a)bellatlantic.net> To: <classiccmp(a)classiccmp.org> Sent: Sunday, October 29, 2000 3:19 AM Subject: Re: INS8154 used in Cytospin