Modem Monday #2: Hewlett-Packard 82950A 80-series Modem

A brief demo of the HP-85 personal computer and the 82950A 300 bps Modem. Also, What the heck is this doing in here? What's the background on it? I found the answer! The orange blocks were Sprague parts that were specifically filter networks for modem design!

Want to know more about HP-85 and what the 80-Series machines could do? Check out CuriousMarc's channel!

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[ryanpaaz]

This one was much more polished feeling, good work. Really dug the section when you dialed out and watched you bounce around a bit. While the tech details are nifty, I love to see the ways they can still be used.

[BollingHolt]

Where did the CTRL-G being a beep originate? I remember learning how to make old PCs do that when I was a kid. As I recall, you could also echo it to LPT1 and most printers would beep as well.

[chriszuhars]

Ya can't please everyone, Dj. Nice video. Sometimes the "long ramblings" have the most interesting content.

[douro]

You are correct about the large Motorola chip being the modem itself. It is an MC68860. The two large Sprague hybrid modules below it are active line filters; the 207C300 is the transmit filter and the 207C400 is the receive filter. I couldn't read the part number of the large ceramic chip on top but I would suspect that is the interface logic for the computer's expansion bus.

Were you the original operator of RMAC?