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Commodore VIC Modem Model 1600

August 30th, 2013 1 comment
Commodore VIC Modem Model 1600

Autopsy:

from Zimmers homepage:

The Commodore 1600 was an extremely prolific and inexpensive modem, introducing millions of computer users to the online world. Marketed to the VIC-20 user, the “VICMODEM” as it was nicnamed, operated in an extremely strange manner.

Instead of connecting to the phone line directly, the VICMODEM relied on a connection THROUGH the phone to the handset. One would dial the number they wished to connect to, then remove the extension from their handset, plugging it into the modem after a carrier signal is heard.

Some customers in Canada were lucky enough to get their VICMODEM packaged with this telephone manufactured in Canada by Northern Telecom. Ironically, the phone did not have a detachable handset, making it useless by itself for use with the modem. Therefore, the set also included a small adaptor which allowed one to plug the VICMODEM directly into the wall line cable, daisy chained to the phone. After dialing with the phone, a switch on the adaptor would redirect the carrier signal to the modem.

Download: Commodore VIC Modem Model 1600 Manual (839)

source: zimmers.net

Commodore Modem Model 8010

May 12th, 2009 6 comments
Commodore Modem Model 8010

autopsy:

This is my first Modem, this is a Acoustic coupler modem for Commodore PET but i could use it with a IEEE488 Interface for the Commodore 64.

The Commodore’s 8010 Modem is an IEEE-488 (1978 standard) device which communicates via any standard telephone.

The 8010 Modem meets Bell 103 standards for communication at a fixed rate of  00 BAUD. The telephone interface is acoustic so the modem is portable. This means Commodore computers can communicate with, large computer systems like The Source and MICRONET, and other small computers.

Initially Commodore supplied software will support the following applications, with many more to come.

1) Terminal emulation.
2) Disk file send and receive.
3) Wordpro 3 sequential file send.
4) Hardcopy using Commodore printers.
5) Disk spooling.

A switchable four-section bandpass filter provides out-of-band rejection assuring accurate processing of the input from received carrier, even at signal levels of less than -47 dBm.

Jitter-free data is guaranteed by a soft limiter and phase lock loop discriminator. The carrier detect circuitry prevents the CBM Modem from operating when excessive noise would produce errors or cause marginal operation. This feature also assures accurate teleprocessing connections and inhibits chatter when the received signal fades.