Well several of my replys were rejected by classicomp email system so here they all are together... :^) Ethan Dicks wrote: I don't have one, but the instruction set was listed on the Internet once or twice, 0,input ... What I don't have is the "Wireing" that graphic on the "cpu" side that controlls operation, and there are part that change with the instructions. Yes I would like a cardiac, any donations? (will trade for C coded emulator :^) [ will code for toys?? ] ) I went on to "design" the 8 bit machine described because cardiac won't handle character data, only 3 digit numbers. I also wanted to make use of the a whole 8 bits, and have each instruction use only 8 bits (well some of them do read the next byte via indirect of the PC) Also I think the flag testing at for each instruction is um clever, what do you think. will repost instruction set if desired. I really wanted some of you to look over the instruction set and theory to see if I was obvously missing somthing. Reply to Zane... Thanks for the pointer to the TOPS-10 emulator I will see what I can do with it...