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Full Version: FSl164A hp-il/RS232 Interface Power Supply
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I am trying to determine the voltage/polarity for the FSl164A's DC power supply. The FSl164A was produced by Firmware Specialists and is very similar to the HP82164a.


9VDC, center positive.

The FSI164A was almost 100% instruction-compatible with the HP unit, but came with two RS-232 channels standard, and optionally up to 8, had deeper buffers, and also had a battery power option. I do believe FSI had told me there was a bug with even parity, but I never used the parity.

Thanks! Does yours have the battery option? Mine does not but I was thinking it might be something I could add.

Edited: 18 Oct 2009, 4:52 p.m.

I don't have the battery option, but since it has a DC input, it would be easy to have an external battery pack plugged in.

I think this was one of three different things with EPROMs in it that I refreshed recently and kept hex files on, since EPROMs don't hold their data indefinitely. I wanted to just read the EPROM into the programmer and then program it back before some of the contents were gone for good. I believe I also did it for my HP92198 80-column video interface and my 82169A HPIL-to-HPIB interface converter. I'd like to do it for the BIOS ROMS for my DOS PC too, but that's the PC the EPROM programmer works on.

Hi Garth,
you can hot-plug the BIOS-EPROMS, remove them after the PC has booted, and reprogram them.

Why not just read them (from DOS) in the PC and create a new set without risking a dead system?