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Tube❄️Time

the 74HC942 is a Bell 103-compatible 300 baud modem, all in one chip! you'd need quite a bit of external circuitry to interface it to the phone line, however.

breadboard with a 74HC942 chip with some resistors, capacitors, and a 3.58MHz crystal
oscilloscope screen showing a square wave (input to the modem) and the transmitted FSK sine wave.
3 comments
Zorin =^o.o^=

@tubetime Given that 1983 date code I wonder if that chip was on my Hayes Micromodem IIe in my Apple II.

DHeadshot's Alt

@tubetime
Could use it for a Kansas City Standard tape interface though?

BSLabs

@tubetime Very nice. I've got a couple Tranz-330s in the stockpile for keypad and VFD reaping... They've got 73K224Ls in them that I believe handle Bell 103. We could have them fight...

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