Does anyone know if there exists an Intel 4004 emulator for a PIC MCU?
(Preferably 16F84). If not, where could I get a databook on the 4004? I am
interested in building a pin compatible emulated 4004, using the PIC (Using
a 16 pin socket and a small PCB with an SMD PIC, clock components and
voltage conversion circuitry). I don't have any practical application in
mind, I just think it would be an interesting project to emulate the first
Microprocessor with a PIC, then builda working computer around it.

Also, where could I get a 4004? If I am to build an emulator, I would need
to know that once it is built, it behaves exactly like the real thing.

I think that the 74f184 would have enough pins to emulate all the signals
used and created by a 4004 -- The pinout of the 4004 is as follows:

             _______    _______
           _|       \__/       |_
  <--> D0 |_|1               16|_| RAM0 -->
           _|                  |_
  <--> D1 |_|2               15|_| RAM1 -->
           _|                  |_
  <--> D2 |_|3               14|_| RAM2 -->
           _|                  |_
  <--> D3 |_|4               13|_| RAM3 -->
           _|       4004       |_
(+5v) Vss |_|5               12|_| Vdd (-10v)
           _|                  |_
 --> CLK1 |_|6               11|_| ROM  -->
           _|                  |_
 --> CLK2 |_|7               10|_| TST <--
           _|                  |_
 <-- SYNC |_|8                9|_| RST <--
            |__________________|

Meaning that if I ignore the Vss and Vdd lines, I have to deal with 14 I/0
lines., which I'd have to fit into PIC's 13. I could maybe lose 1 of the
clock lines, but I have no idea what they do (Why is there 2? Is this like
the PICs where only a few external components are required to create an
oscillator?) I couldn't use the clock lines to directly drive the PIC,
because some of the CISC instructions might need a few RISC instructions to
execute.

I have a 4004 instruction list, and it looks like it would be an easy thing
to emulate. The tough part would be to have emulate all the output signals
with proper timing.

At what speed did the 4004 run? I imagine a 16F84 at 10 MHz would be
adequate enough to emulate any Microprocessor created in 1971.

If anyone could provide me with information as to what all the pins mean or
where I could get a databook, It would be greatly appreciated :)

- Keelan Lightfoot