[sebhc] Re: Welcome & Bio

Dave Dunfield dave04a at dunfield.com
Wed Mar 31 05:42:42 CST 2004

I'm a collector of old mostly 8-bit computer equipment.

Recently acquired an H8 - complete with all manuals and in good condition.
It's the basic unit, with two add-in cards: 4k ram and serial/cassette.

I do not have a disk drive system, but would love to find one. I would also
very much like to obtain other Heath/Zenith machines.

Still trying to locate the cassette software.

My interest is mainly in preserving history - As time permits, I have been
preparing "packages" for my machines, which include detailed "inside and out"
photographs of the machine and all subassemblies & peripherals, scans of all
available documentation and reference material, and a PC based simulation.
If I can find a decent free simulator, I taylor it as much as possible to
reflect the actual machine in my collection. I've written my own simulator
for a few of the machines. - So far the only H8 simulator I've found is not
usable to me, so it looks like I will be writing my own - since I already have
the 8080 engine, this shouldn't be too difficult.

So far I have completed about a dozen of the 70+ machines I currently have
on hand (This takes a *LOT* of time!)

I also run a mail order software company specailizing in development tools for
8-bit families including the 8080 (CPU used in my H8).

The H8 is of special interest to me because it's an early machine based on the
8080 processor. Although my very first home computer was a RCA 1802 based machine
in the mid 70's, I quickly "graduated" to a homebuilt 8080 machine, and then got
an Altair 8800, also 8080 based (which I still have :-)

I've written a TON of 8080 software in the early years, including: My own O.S.,
BASIC, Assembler, C compiler, lots of system utilities and other things. I plan
to port as much of this as possible to the H8 - a lot of it won't make sense
unless I can find a disk system, but I am looking...

dave04a (at)    Dave Dunfield
dunfield (dot)  Firmware development services & tools: www.dunfield.com
com             Vintage computing equipment collector.

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