Help with H89/H19
Wes Groleau wrote:
Sorry for being off-topic, but the heath/zenith NG seems to have died.
Does it help if I have an expired ham license? :-)
I have need of an RS-232 terminal, and I know that
my H89 (with no floppy--boat anchor!) contains one.
Can anyone point me to details for disconnecting the
H19 board from the CPU board and connecting it instead
to the DB-25 on the back?
This is from vague, 27-year-old recollection.
There are two boards in the H89. One of the boards
is the computer, the other is a terminal. The terminal
board is the one attached to the actual CRT, the computer
is attached to the (100KB, hard-sectored) diskette drive.
The computer and terminal are attached with a single
cable with perhaps 5-7 lines using standard RS-232
levels. You just need to pull that cable off, figure
out the pinning on it, and make a replacement cable to
connect to the DB-25. I can't remember well, and I advise
proceeding with caution, but I very vaguely recall that
maybe you could move the cable that connects the computer
to the DB-25 to the terminal board, after removing the
cable that connects the two boards together.
(Even better, connecting it directly to a DB-9 which I'd have to buy)
I need it to configure a Sun Ultra, since I don't have a Sun monitor.
You've got some vintage hardware there ;-)
Dana K6JQ
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