Hi tchiwam,
Nice work on the 8664 to 8665B conversion.
I have a 8665B with early firmware. It came from Spokane, WA via eBay. I've been told HP developed the 8643, 8644, 8645, 8664 and 8665 instrument line there. My instrument is probably and early production unit used in HP's engineering. I also have a broken 8664B with Ver 4.2.2 firmware. I copied the four EPROMs on the controller board in multiple fill formats (S Records, HEX, and Bin) with an EQ-4X programming tool.
I want to update the firmware in the 8665B to Ver 4.2.2 so I got four 27C010 EPROMs and loaded my Bin files into them. The programming worked but the 8665B thinks it is a 8664B and doesn't know about its doubler board (MW EXT).
https://www.eevblog.com/forum/Smileys/default/embarrassed.gifI'm hoping someone has copied the controller board EPOMS from a 8665B with Ver 4.2.2 firmware, and is willing to post them. Has anyone haked Ver 4.2.2 firmware and willing describe the process?
Regards,