Can Tandy Color Computer 3 use RetroModem Bridge?

A CoCo 3 with a Deluxe RS-232 Pak, Multi-Pak Interface, or compatible serial solution can use RetroModem Bridge to dial Telnet BBSes from terminal programs such as NetMate.

Can Tandy Color Computer 1 and 2 use RetroModem Bridge?

Earlier CoCo systems can use RetroModem Bridge when paired with compatible serial hardware and terminal software.

Can TRS-80 Model I, II, III, and 4 use RetroModem Bridge?

TRS-80 systems with serial hardware can use RetroModem Bridge as a modern Telnet BBS path without a real phone line.

Can Commodore 64 and 128 use RetroModem Bridge?

A Commodore with an RS-232 or modem interface can use RetroModem Bridge to reach Telnet BBSes while keeping the classic terminal workflow.

Can Apple II family use RetroModem Bridge?

Apple II systems with serial cards can use RetroModem Bridge by running terminal software and connecting the serial side to a Windows PC.

Can Atari 8-bit computers use RetroModem Bridge?

Atari 400, 800, XL, and XE computers can use the bridge when paired with the right serial interface and terminal software.

Can Amiga use RetroModem Bridge?

Amiga computers with serial ports can use RetroModem Bridge as a modem-like path to Telnet BBSes.

Can Atari ST use RetroModem Bridge?

Atari ST systems can use their serial ports and terminal software with RetroModem Bridge for modern BBS access.

Windows bridge for real retro computers

Put your vintage computer back on the BBS scene.

RetroModem Bridge is a Windows serial-to-TCP modem bridge that lets classic machines dial Telnet BBSes through a serial connection. Your Tandy Color Computer 3, TRS-80, Commodore, Apple II, Atari, Amiga, DOS PC, CP/M machine, or other serial-capable computer can use familiar Hayes-style ATDT commands while your modern PC handles the internet connection.

Download v3.4 ZIP View on GitHub

ATDTClassic dialing

v3.4Door mode

.NET 8Windows app

Tandy Color Computer 3 with Multi-Pak Interface connected to RetroModem Bridge on a Windows laptop

What it is

A modern bridge for old modem habits

RetroModem Bridge lets a real retro computer behave like it is dialing through a modem, while Windows handles the serial connection, Telnet session, aliases, BBS directories, and local door game launching.

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Retro computer side

Your old machine runs a normal terminal program and sends AT commands over serial.

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Windows bridge side

The app listens on the COM port, understands dial commands, manages aliases, and opens the matching TCP or local door session.

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BBS or door side

The destination can be a Telnet BBS on the internet or a local Windows door game configured inside RetroModem Bridge.

Features

Built for people who actually use old machines

A Windows control panel for vintage dialing, BBS browsing, session monitoring, local door games, and old-school ATDT workflows.

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Serial to TCP bridge

Connect a vintage computer over serial, then bridge the session to Telnet BBSes over TCP. A USB serial adapter option helps connect old serial hardware to a modern PC.

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Hayes-style AT commands

Type commands like ATDT COCONET or ATDT DARK. RetroModem Bridge catches the command, looks up the alias, and opens the connection.

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Built-in BBS directory

Import listings, create aliases, mark favorites, and dial them from the old computer without memorizing hostnames and ports.

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Local Door Game Mode

Dial a local alias such as ATDT USURPER, and the Windows PC launches the configured door game while the retro terminal stays connected.

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Terminal preview

The Windows side includes a terminal preview and session mirror so you can see what the retro computer is seeing.

✓

Friendly Windows setup

Choose the COM port, baud rate, Telnet options, aliases, profiles, and door settings through a Windows GUI.

Serial-to-TCP for vintage computers

Built for real retro BBS access, not just screenshots

RetroModem Bridge is for people who want an actual vintage computer to dial Telnet BBSes, browse a BBS directory, and launch local door games through a Windows PC.

📟

CoCo 3 and TRS-80 modem bridge

Use a Tandy Color Computer, Deluxe RS-232 Pak, Multi-Pak Interface, and terminal software to dial BBS destinations with familiar Hayes-style commands.

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Telnet BBS without a phone line

The old computer keeps the modem feel while RetroModem Bridge turns serial traffic into TCP connections for modern Telnet-accessible BBS systems.

🔌

Simple Windows serial setup

Most setups use a USB serial adapter between the vintage serial hardware and the Windows PC. USB serial adapter option.

Door game mode

Dial local games like they are BBS doors.

RetroModem Bridge v3.4 adds experimental Local Door Game Mode. Add a door game on the Windows PC, give it an alias, and dial it from the retro machine.

ATDT MENU
1. BBS Listings
2. Door Games

ATDT USURPER
CONNECT 19200

Screenshots

Real project screenshots

Windows app screens, CoCo 3 terminal views, ATDT menus, and door game configuration screens from the project.

**RetroModem Bridge main window**The Windows control center for COM port, baud rate, modem options, bridge controls, and connection status.

**Bridge running and connected**The app acts like a modem on one side and a Telnet connection on the other.

**Tandy Color Computer 3 connected**A real CoCo 3 dialing into the modern BBS world through serial and RetroModem Bridge.

**Door Games tab**Version 3.4 adds a separate Door Games area for local games like Usurper Reborn.

**Door game listings**Local doors can be listed, configured, and launched from simple ATDT aliases.

**Usurper Reborn through RetroModem Bridge**RetroModem Bridge brings local DOOR32 door games like Usurper Reborn to the Tandy Color Computer 3 through a real serial terminal experience.

Retro Computer FAQ

What computers can use RetroModem Bridge?

Any retro computer with a usable serial connection and terminal software can benefit. Most setups need the right machine-side serial hardware plus a USB serial adapter on the Windows PC.

Tandy Color Computer 3

A CoCo 3 with a Deluxe RS-232 Pak, MPI setup, or compatible serial solution can dial Telnet BBSes from NetMate or another terminal.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

Tandy Color Computer 1 and 2

Earlier CoCo systems can also benefit when paired with compatible serial hardware and terminal software.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

TRS-80 Model I, II, III, and 4

TRS-80 systems with serial hardware can use RetroModem Bridge as a modern path to Telnet BBSes without a real phone line.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

Commodore 64 and 128

A Commodore with a serial modem interface or RS-232 solution can reach Telnet BBSes while still feeling like a classic modem session.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

Apple II family

Apple II systems with serial cards are a natural fit. Use terminal software on the Apple II and let RetroModem Bridge do the internet work.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

Atari 8-bit computers

Atari 400, 800, XL, and XE machines can benefit when paired with the right serial interface and terminal software.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

Amiga

An Amiga with a serial port can use RetroModem Bridge to dial Telnet BBSes through a Windows PC.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

Atari ST

The Atari ST has strong terminal software options and can use its serial port with RetroModem Bridge.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

DOS PCs

A DOS PC with a COM port and terminal software can use RetroModem Bridge as a modem-like gateway to Telnet systems.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

CP/M systems

Many CP/M machines with serial terminals or serial expansion can use the same bridge concept.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

Vintage laptops

Old DOS or early Windows laptops with serial ports can dial through RetroModem Bridge for an authentic terminal experience.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

Other serial-capable computers

If the machine can send AT-style commands over serial and run a terminal program, it may work.

Typical setup: retro serial hardware plus a Windows PC. USB serial adapter option.

Getting started

Basic setup flow

Let the old computer keep acting old, and let the Windows PC do the modern networking work.

1Connect the vintage computer serial interface to a Windows PC with a USB serial adapter.
2Open RetroModem Bridge and select the COM port used by the adapter.
3Pick a baud rate supported by the terminal and serial hardware.
4Click Start Bridge and open your terminal program on the retro computer.
5Type an ATDT command, use an alias, or open the ATDT MENU.

Works with serial-capable machines

TRS-80 Color ComputerCommodoreApple IIAtariAmigaDOS PCCP/M

A Deluxe RS-232 Pak, USB serial adapter, and a terminal like NetMate is one example setup for the CoCo 3 crowd.

USB serial adapter for this kind of setup

Download

Try RetroModem Bridge v3.4

Grab the latest release, connect your serial hardware, start the bridge, and dial back into the BBS world.

Download release ZIP Open repository