TELECOM Digest OnLine - Sorted: Re: History of Hayes Modem

Re: History of Hayes Modem

Justa Lurker (
Wed, 11 Jan 2006 01:20:01 GMT

Scott Dorsey wrote:

> The Great Idea Finder <> wrote:

>> Dennis C. Hayes invented the PC modem in 1977, establishing the
>> critical technology that allowed today's online and Internet
>> industries to emerge and grow.

> Well, THERE is some pretty impressive revisionism. Hey, by 1977 there
> were even kits like the Pennywhistle aimed directly at the
> microcomputer community. --scott

Yes, but wasn't a key difference between the two that the early modems
like the Pennywhistle, etc. were more or less totally transparent to
the data stream and the connection had to be manually dialed on a
separate phone's keypad, the user had to listen for an answer tone
before hitting "connect", manually disconnected at the end of the
call, etc. while the Hayes modem was the first popular mass-market
modem which also featured the escape sequence (+++), AT commands, call
progress tone detection, etc.? The latter capabilities would put all
modem operations truly under program control without need for any
"hands-on" manual operation or intervention.

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