Heath H19 - test-drb@ccmp.vtda.org

17 Jan 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