🚀 go-pugleaf

So what's the problem of running a Z-100 at >10MHz?   They can run very nicely
at 10.7MHz.   Standard new motherboard with ZDS factory 256K DRAM 8MHz 
or new motherboard with HA-108 chip upgrade.   150nsec 256K DRAMs work okay,
but I feel better with 120nsec.   Just replace the 8088-2 with a 8088-1
(10 MHz) and up the crystal to 32MHz, also replace all NEC ICs except the
keyboard controller (and I don't trust that) with non-NEC brands if there
are any in your machine.  DO NOT USE a V20 CPU at any rating.   

The 10.7MHz Z-100 will now blow timming windows in the Z-100 RS-232 and
floppy controller diagnostics - this is a fault of the diagnostic software
using loops to time events that are now too short.  All other diagnostics
will run normally.

I can make available at cost PC Boards for a baby-board assembly so you don't
hack the Z-100 crystal on the motherboard.   The device is a PCB, wire-wrap
socket, resistor, crystal oscillator, two wires to a toggle switch on the
rear panel.  You get the 8MHz from the motherboard one way, throw the switch
and get the speed from the oscillator the other way.  You remove U236, stick
it in the device and put the device in the socket that you removed U236 from.
If you socket the oscillator, you can safely experment with system speed
increases, using the motherboard 8MHz to fall back on.

Cheers,
Gern
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