repairing/testing 82161a IL issue using 82162a

[Martin Hepperle]

There is also a "scope" program for the HP 75 (I believe somewhere in PPC-J or in Datafile and in the HP-75 Horn disk collections).

I used it in a larger IL-loop with a HP 110 and several peripherals.

Yes, the HP-75 wants to be system controller at startup.
The trick is to start the loop with another controller and the HP-75 not yet part of the loop.
On the HP-75 the scope program is started (still out of the closed loop) and this program clears the controller bit in the HP-IL chip (LEX Files with HPILCMDS and RIO/WIO are needed, or the I/O ROM).
Then the HP-75 can be "hot plugged" into the HP-IL loop and the scope program writes all HP-IL mnemonics to the display and also to a file.

Martin