H89 as serial terminal

From: Dwight K. Elvey <dwightk.elvey_at_amd.com>
Date: Thu Mar 27 18:43:00 2003

>From: "Patrick Rigney" <patrick_at_evocative.com>
>
>> The hardware solution is to disconnect the internal serial cable from the
>> termianl logic PCB (the rearmost vertical PCB in the machine) and replace
>> it with one of the cables that goes to a DB25 connector on the back
>> (these cables are normally connected to the serial port PCB plugged into
>> the computer mainboard, just in front of the terminal logic PCB). The
>> cables have a Molex 0.1" pitch SIL connector on the end, and fortunately,
>> the pinout of all the internal serial connectors (terminal logic PCB,
>> computer 'console port', serial port PCB) is the same.
>
>Ouch...
>
>> The software solution is to write a little program that transfers
>> characters between the computer's console port and one of the other
>> serial ports. This will then make the computer section appear as a
>> transparent link between the terminal and the outside world.
>
>much easier than any of the above... get a copy of MDM712 or similar
>terminal emulation program. MDM712 comes with a serial port driver for
>H8/89. Plug your device into the spare serial port on the back of the
>(unopened) machine, and that should do it. Some '89's have three-port
>serial cards... I don't know which ends up being which or whether MDM712
>lets you choose, all of my '89's are down right now. :-/
>
>Patrick
>

Hi
 Why would you assume that finding and installing some
software would be easier than making up a simple molex adapter
connector. As I recall, it was a 9 pin molex but I could
be wrong. That is all of 9 wires to deal with.
Dwight
Received on Thu Mar 27 2003 - 18:43:00 GMT