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

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Tue Aug 3 18:09:07 2004

> 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).

Received on Tue Aug 03 2004 - 18:09:07 BST

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