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We got my old ATARI 400 to work with a sufficiently old TV set. The 2600 needs more work in order to work, and the joysticks need to be replaced or refurbished
It looks almost identical to the first family PC that we had. However, I think our's was faster and didn't look like it would fall apart if you touched it!
Now, this is my oldest modem. It was made some time after 1975 going by the marks on the few chips in there. It's a 300 baud (or bps, same thing) acoustic coupler in a walnut case.
This device seems to work fine when powered on. It whistles its 300 baud carrier and the existing lights light up (it was always missing the carrier lamp and its holder, sadly)
You put your phone on the regal mat on the top, dial up, wait for the carrier tone, put the receiver in the depressions inside the case, and close the soundproofed lid. (there's a slot for the receiver cable).
You can choose between half and full duplex operation using a switch on the front panel and you get incandescent data, carrier and power lights.
Shot with several modern modems (with some extra bits built-in) for comparison.
My first modem: a Hyundai HMD-1202P. It was a present and it's been in my posesssion since March 1991. It's still boxed.
One setting I wish was included with Windows computers was "Don't update this computer because it never works."
Now that Windows *forces* updates occasionally, I have to make sure all data is backed up *daily*, and that I regularly set "restore points", because no update has worked for several years, and each time it shuts the computer down and can only start again after doing a system restore.
(The only thing that works for me is to keep it off the internet except when I absolutely need internet, but even then, sometimes an update gets forced through.)
The business end of the device, with serial ports (I think the DIN one is for a Commodore PET—really not sure though, I never bothered checking).
I'm also *assuming* that this is a serial port and not a 20mA current loop interface. Again, I haven't checked thoroughly. I treat this device with kid gloves and the respect it deserves.