HP75C I/O Rom Essential for HP-IL?

[vassilisprevelakis]

(09-09-2020 12:09 PM)pamphonica Wrote:  I was wondering about doing the same on an HP75C, which does have HP-IL hardware built-in. But can I do anything with HP-IL without the I/O Rom? If not, that may make the project rather pricy! HP75Cs without ROMs are quite cheap. But I/O ROMs are rare.

Hi Jeremy,

The HPILCPMDS lex file that Sylvain mentioned allows you to do most tasks you'd want to do with HP-IL. It is lower level than the I/O ROM and hence writing code for it is more of a pain.

Even though I don't have an I/O ROM I still managed to use my 75C with HP-IL controlling the 82186A modem, HP 82164A RS/232 etc.

Specifically I used the 82164A to drive a serial plotter (HP-7220C).
You can see the video and find out more about this in my youtube video at: https://www.youtube.com/watch?v=r0sL62EWkhY

Vassilis
http://www.series80.org