Heath H19

From: dave dameron <ddameron_at_earthlink.net>
Date: Sun Jan 17 13:34:15 1999

At 04:57 PM 1/16/99 +0000, Tony wrote:
>[H19]
>
>> Yes, I found the manual and there is both an encoder AND a ROM. Seems sort
>> of redundant, can only guess why. Many years ago the encoder chip died in
>> mine, and I first tried the generic version of the chip, most likely a GI
>
>Ouch... Something to watch for if mine ever dies...

Or the generic replacement was bad, and the Heath one was good, also the generic
part? The 2 bad parts are long gone, so I cannot retest them.
>
>> part. It didn't work, ended up ordering a replacement from Heathkit which
>> did work.
>
>Didn't work at all, or gave you the wrong characters? If the latter, then
>maybe reprogramming the ROM would sort it out.

The first (original) had no strobe output, so appeared dead. The generic one
I don't remember now, but even so, had no provision to program EPROM's then.

Later a built a single board Z-80 computer that could copy, edit (HEX) and
program 2716's, 2732's and 2764's. It used the H19 as its terminal.
Am trying to remember what I used to program its monitor EPROM..."you need
to program a EPROM with routines to get your EPROM programmer to run..." I
think I found someone with a Cromemco system that could.
-Dave
Received on Sun Jan 17 1999 - 13:34:15 GMT