I remember a series of messages awhile ago regarding emulating a 4004 with the
pic...

Keelan Lightfoot first requested info regarding either 1) pic firmware to
emulate the 4004, or 2) info on the 4004 so he could write such software.  The
discussion generated 15 messages with the subject "4004 on PIC?" and "intel
4004" from 9/20/99 to 9/23/99.

That should be enough info to search the archive for the messages.  There were
several posts to info about the 4004, but no one knew of PIC code to emulate the
beast.

-Adam

"Quitt, Walter" wrote:
>
> If you sit me down in front of a Varian 620A,
> I think I could toggle in a boot for it.
> My RCA Cosmac (CMOS 4 bit processor) kit used
> toggles switches.
> Dang, I think I need to write a PIC program that
> uses toggles switches and emulates something like
> a 4004.
>
> Heh, heh, heh.....
>
> -----Original Message-----
> From: M. Adam Davis [mailto:adavis@UBASICS.COM]
> Sent: Tuesday, April 18, 2000 2:01 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT] "Best" Editor (was: "Syntax Highlighting in MPLAB")
>
> Actually, it's about time for someone to talk about entering programs using
> a
> bank of switches and blinking lights...
>
> "Terminal?  Heck, kid, we didn't even know what a teletype was!  Punch cards
> were too expensive for us back then.  We switched the switches, and hope we
> didn't enter into an infinite loop, thats whut we did!"
>
> -Adam
>
> James Newton wrote:
> >
> > Years ago, I saw a program (a .com) that could be entered by
> > COPY CON HEX2BIN.COM
> >
> > Some guy had figured out how to write the program by mapping instruction
> > opcodes to ASCII keystrokes! So after you typed that in, you could, in
> fact
> >
> > COPY CON BINARY.HEX
> > HEX2BIN < BINARY.HEX > BINARY.COM
> >
> > Yeah! That's a real programmer! <Sniff><Adjust waistband>
> >
> > Is this where I brag about writing Win32 app's in MASM?
> >
> > ---
> > James Newton (PICList Admin #3)
> > mailto:jamesnewton@piclist.com 1-619-652-0593
> > PIC/PICList FAQ: http://www.piclist.com or .org
> >
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of andy howard
> > Sent: Tuesday, April 18, 2000 11:18
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [OT] "Best" Editor (was: "Syntax Highlighting in MPLAB")
> >
> > > From: "M. Adam Davis" <adavis@UBASICS.COM>
> > > Every real programer uses EDLIN under DOS 3.1.
> > > -Adam
> >
> > Nah, COPY CON PROGRAM.HEX