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CoCo Modems: Difference between revisions

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| Tandy || DCM-3 || Direct Connect Modem 3 || 26-1178 || Direct || White || style="text-align:right;"|300 || [https://www.radioshackcatalogs.com/flipbook/c1986_rsc-15.html?fb3d-page=49 RSC-15, p. 49] || style="text-align:center;"|1986|| style="text-align:right;"|59.95 ||  
| Tandy || DCM-3 || Direct Connect Modem 3 || 26-1178 || Direct || White || style="text-align:right;"|300 || [https://www.radioshackcatalogs.com/flipbook/c1986_rsc-15.html?fb3d-page=49 RSC-15, p. 49] || style="text-align:center;"|1986|| style="text-align:right;"|59.95 ||  
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| Tandy || DCM-8 || Direct Connect Modem 8 || 26-1393 || Direct || White || style="text-align:right;"|300 ||  || style="text-align:center;"|198x|| style="text-align:right;"|59.95 || || [https://www.radioshackcatalogs.com/flipbook/m-sale_1990_460.html?fb3d-page=23 $19.95 SF-460]
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! Brand !! Name !! Full Name !!  Cat. No. !! Type !! Color !! Speed !!  RSC !! Year !! Price || RSC/SF Price History
! Brand !! Name !! Full Name !!  Cat. No. !! Type !! Color !! Speed !!  RSC !! Year !! Price || RSC/SF Price History
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| Radio Shack || Telephone Interface II || Telephone Interface II  || 26-1171 || Acoustic Coupler || Silver || 300 || [https://www.radioshackcatalogs.com/flipbook/c1981_rsc-04.html?fb3d-page=30 RSC-04, p. 30]|| 1979 (1981 for CoCo) ||  199.00 ||  
| Radio Shack || Telephone Interface II || Telephone Interface II  || 26-1171 || Acoustic Coupler || Silver || 300 || [https://www.radioshackcatalogs.com/flipbook/c1981_rsc-04.html?fb3d-page=30 RSC-04, p. 30]|| 1979 (1981 for CoCo) ||  style="text-align:right;"|199.00 ||  
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| Radio Shack || DCM-6 || Direct-Connect Modem 6|| 26-1393 || Direct || White || 300/1200 || [https://www.radioshackcatalogs.com/flipbook/c1987_rsc-17b.html?fb3d-page=41 RSC-17B, p. 41]|| 1987 ||  59.95 ||  
| Radio Shack || DCM-6 || Direct-Connect Modem 6|| 26-1393 || Direct || White || 300/1200 || [https://www.radioshackcatalogs.com/flipbook/c1987_rsc-17b.html?fb3d-page=41 RSC-17B, p. 41]|| 1987 ||  style="text-align:right;"|59.95 || [https://www.radioshackcatalogs.com/flipbook/m-sale_1990_460.html?fb3d-page=23 $19.95 SF-460]
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| Radio Shack || DC-1200 || Direct-Connect 1200 Modem || 76-1005 || Direct || White || 300/1200 || [https://archive.org/details/Radio_Shack_Catalog_CCF833_1983_Radio_Shack/page/n9/mode/2up RSC-10, p. 29]|| 1982 ||  699.00 ||  
| Radio Shack || DC-1200 || Direct-Connect 1200 Modem || 76-1005 || Direct || White || 300/1200 || [https://archive.org/details/Radio_Shack_Catalog_CCF833_1983_Radio_Shack/page/n9/mode/2up RSC-10, p. 29]|| 1982 ||  style="text-align:right;"|699.00 ||  
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Revision as of 01:07, 16 August 2024

WELCOME
Looking for CoCo help? If you are trying to do something with your old Color Computer, read this quick reference. Want to contribute to this wiki? Be sure to read this first. This CoCo wiki project was started on October 29, 2004. --OS-9 Al

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This page was last updated on 08/16/2024. Total Pages: 744. Total Files: 994.

Home / Hardware - CoCo Modems

CoCo modems came in essentially two types.

Ones that were specifically designed, made, and advertised with the CoCo in mind, and those that were not and which the CoCo had to use adapters or other products for.

The vast majority of computer modems in the 8-bit era used standard serial ports with the large D-shaped 25-pin connector.

Modems made with the CoCo in mind have this, but also have the round, 4-pin DIN connector which accepts Radio Shack' six-foot male-to-male 4 pin to 4 pin serial cable, Catalog Number 26-3020, sold for $4.95 starting in 1982's RSC-07, going all the way to RSC-21 in 1990 for $5.95.

Modems with CoCo 4-pin Serial Ports
Brand Name Full Name Cat. No. Type Color Speed RSC Year Price Notes RSC/SF Price History
Radio Shack Modem I Direct Connect Modem I 26-1172 Direct Silver 300 RSC-6, p. 13 1982 149.00 $69.95 SF-375
Radio Shack Modem II Direct Connect Modem II 26-1173 Direct Silver 300 RSC-6, p. 13 1982 249.95 $199.95 RSC-10
Radio Shack Modem IB Direct Connect Modem IB 26-1175 Direct White 300 RSC-10, p. 29 1984 99.95
Radio Shack DCM-3 Direct Connect Modem 3 26-1178 Direct White 300 RSC-15, p. 49 1986 59.95
Tandy DCM-3 Direct Connect Modem 3 26-1178 Direct White 300 RSC-15, p. 49 1986 59.95

Tandy also sold a CoCo modem under Tandy Data Products branding. It came out in 1982 and had a white case. The TDP-branded version of Radio Shack's CoCo serial cable (Cat. No. 26-3020) was Stock Number 10-1270, also sold for $4.95. One authorized seller was Spectrum Projects.

TDP Modem
Brand Name Stock No. Type Color Speed Year Price Notes / Price History
TDP Modem I 10-1290 Direct White 300 1982 149.00

Before the advent of modems with CoCo-specific serial ports, Tandy promoted its existing modems for which the CoCo needed to use an adapter cable with a 4-pin DIN for the CoCo end of the connection, and a 25-pin DB25 connector for the modem's side. Radio Shack's offering, Catalog Number 26-2014, sold for $19.95 starting fall 1980 in the 1981 RSC-4.

Another way to make use of such modems was the Deluxe RS-232 Program Pak, which has a DB-25 female serial port on its other side, allowing CoCos to connect to the modem with a standard RS-232C serial cable like Radio Shack's own Model III RS-232C cable (Catalog Number 26-1408).

Manuals for these modems would at times ignore the CoCo but would at other times specifically mention how to connect it to a CoCo. For example, the DCM-6 manual, p. 10.

CoCo Modem without CoCo Serial Port
Brand Name Full Name Cat. No. Type Color Speed RSC Year Price RSC/SF Price History
Radio Shack Telephone Interface II Telephone Interface II 26-1171 Acoustic Coupler Silver 300 RSC-04, p. 30 1979 (1981 for CoCo) 199.00
Radio Shack DCM-6 Direct-Connect Modem 6 26-1393 Direct White 300/1200 RSC-17B, p. 41 1987 59.95 $19.95 SF-460
Radio Shack DC-1200 Direct-Connect 1200 Modem 76-1005 Direct White 300/1200 RSC-10, p. 29 1982 699.00
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