rarest computers. was: RE: Xerox Alto Restoration + Emulation

[Tony Duell]

> H&H Tiger, a dual-CPU (Z80 and 6809) machine.

You missed out the NEC 7220 graphics chip which is halfway to being a 
processor IMHO. So it's a 2.5 processor machine. 

> 
> Whitechapel MG-1, a 32016 Unix machine, made in Whitechapel, London.

I have one, still working...

I also have, but have done nothing with it yet, a Whitechapel Hitec 20 
and a lot of spare boards (not all from the same source). The mainboard 
is PC/AT formfactor (in fact it's in a PC tower case), and has 3 ISA 
slots. The other 5 connectors are DIN41612s, for the CPU board (MIPS 
R2000 CPU + FPU + MMU chips), RAM and video cards. The mainboard contains 
things like serial ports (although there are 2 more on the CPU board), 
SCSI, ST506 and floppy controllers, keyboard controller (an 8042, 
presumably PC/AT like), and so on.

Does anyone have pinouts (or other hardware info) for the R2000 chips (I 
can get the exact numbers if anyone thinks they can help). All I can seem 
to find is programming manuals.

> 
> Arcturus, reputedly London University's first computer.  CPU boards
> in a small rack, all TTL as far as I can tell.

I am supreised that London University didn't have any sort of computer 
before the late 1960s (that's when TTL came out IIRC).

-tony