Sounds a lot like the Digital Equipment Corp (DEC) PDP8s. They used DTL logic on standardized little cards that were plugged into a wire wrapped backplane that created the architecture. Sometimes you'd get a 'patch' that involved rewiring the backpane to fix a timing glitch. 1Mhz clock if I remember correctly. I had a PDP8 in my garage, and had compressed it from 3 bays to two by rearranging some of the modules. 4k/8k of core with 32KW (12 bit) of damn fast disk and DECTape (oohhhh). Had to reduce it to a pile of parts a couple years ago (da pain, da pain...). The first octal digit was the instruction type (load/store/clear call, etc. while the other 3 were an offset to the memory location you wanted to mess with (IIRC). We had banking issues even back then. R gtyler wrote: > > I programmed a computer made By ITT in europe that controlled a letter > sorting machine that used octal. It was actually very pleasant to use. The > computer ran at a blistering 20Mhz and had 32K of magnetic memory. It > occopied 3 bays and paper tape and a bank of switches were the only way to > load a program. You had to enter a loader program first, then run the paper > tape. The CPU was made out of 74 series TTL gates that had matched > propagation delays. > > George > > ----- Original Message ----- > From: "Alan B. Pearce" > To: > Sent: Wednesday, August 06, 2003 10:24 AM > Subject: Re: [OT] Excel decimal to hex conversion? > > > >What? No one programming DEC PDP11's or DataGeneral 1200's anymore? > > > > Or 8080 micros? IIRC a fair amount of code for these was done using octal > > because the way the register addressing is done lends itself to octal. I > > seem to remember a fair number of programs where listings where published > in > > magazines like Byte were actually done as octal. > > > > -- > > http://www.piclist.com hint: The list server can filter out subtopics > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics