MC writes: > You must be my evil twin... ... > > I too came through the old Signetics 2650 'and all the glue' route, = > although I've kept my fingers occasionally into hardware via my work. Oh My God! another 2650 user! No way. The thing is, if they hadn't had that on chip stack (yeah, I know the pic does too but different market) that prevented ever writing any sort of real compiler or OS for it, I think the 2650 was about the nicest processor of that time. Easy timing and interface, sweet to program (compared to an 8080 thats not hard), perhaps a trifle slow. Coulda been a contender. > Not really.. your old TTL books are still a good resource Believe it or = > not, I am still using a Signetics Logic-TTL data manual on my desk = > (1978!). It is a good size, quality printing, and the core logic has = > not changed much over the years (except improved)... so if you work to = > the 1978 specs, you have even more margin than you expected. Are you talking about the little shirt pocket sized Signetics Logic book? I still have that one, it was way way handy, but I dumped all the rest years ago. -dg David Gould dg@illustra.com 510.869.6383 or 510.305.9468 Informix Software (formerly Illustra) 1111 Broadway #2000 Oakland, CA 94607 - I realize now that irony has no place in business communications.