Basic ROM for HP Portable Plus

[pamphonica]

Problem Found.

I am now pretty sure that the problem was a corruption introduced during the binary file transfer from my old Win98 machine to the Dataman S4 programmer.
This serial link has no flow control and I may have lost bits along the way.
So the ROM image on the programmer verified nicely with the burned ROM, but was garbage!

I splashed out on a nice TL566IIplus programmer, which runs off a USB port on my main computer.

I have now succesfully re-burned and run:
- Bob Prosperi's 2-ROM Turbo Pascal 3.02
- Martin Hepperle's 1-ROM Turbo Pascal 3.00
- J-F's Utilities ROM

So all is now full speed onto understanding how to use Martin's TP includes to run testgear over HP-IL.
Thanks all for your very helpful suggestions.
In the end it was effectively operator error!

-Jeremy