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[Doug]

On 09/20/2013 12:41 PM, Liam Proven wrote:
> On 20 September 2013 17:28, Nils Kassube <kassube at gmx.net> wrote:
>> You could run z80mu.exe in dosemu ... and my 1.8GHz core2duo even gives
>> a reasonable speed: "Effective Z80 clock speed is 13025330 Hz".
> 
> 13MHz? That is quite quick, but I think real Z80 hardware went faster!
> 
> 
I'm not sure about that. I built the Big Board, and it first ran at
2MHz The mod was to put in a Z80 and change the clock to make it run at
4MHz. I'm pretty sure the Xerox version was the same. (Or maybe it
started with a Z80, I don't remember, but I do remember upgrading to
4MHz.)

I used the built-in keyboard and video circuitry, and I had to modify
the video circuit to get more bandwidth--it blurred the letters on the
screen until I did that. I wrote it up for the magazine, and got a
tee-shirt for my troubles!

--doug



-- 
Blessed are the peacemakers..for they shall be shot at from both sides.
--A.M.Greeley