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Questions tagged [modem]

Discussion of retrocomputing modems.

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9 answers
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Why did modems have speakers?

Everyone who used early telecommunications services, not to mention the early dial-up Internet services, is familiar with the tones and hissing sounds of a modem establishing a connection. I recall ...
Brian H's user avatar
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75 votes
7 answers
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What technological factors drove the rise of "high-speed" modems in the early 1990s?

The first inexpensive modem I ever purchased was a 300 baud direct-connect unit for the C64 User Port in late 1983. I recall that a couple of years later (1986), 1200 baud modems were affordable and I ...
Brian H's user avatar
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34 votes
6 answers
6k views

How can I construct a dial-up network in my home, purely for the kicks?

All the technology in my house is modern, but I want to build a dialup network that I can use to produce sounds from Bell 101/103 (if I can find the proper softmodem) to V.92bis. I honestly don't know ...
jediKatana's user avatar
13 votes
6 answers
1k views

How was parity used with modems?

On the back of this question which talks about 5- and 6-bit communications, I remember back in the BBS days that it was common to set your terminal to 8N1, (a.k.a. 8 bits, no parity, 1 stop bit) to ...
bjb's user avatar
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11 votes
2 answers
1k views

Why did the Bell 103 modem specification use 1070Hz, 1270Hz, 2025Hz and 2225Hz?

The Bell 103 modem spec gives the following frequencies to use: Transmit Side: 1070Hz (space) and 1270Hz (mark) Receive Side: 2025Hz (space) and 2225Hz (mark) Why were these specific frequencies ...
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