GuruModem RS-232 WiFi

The Coleco's ADAM GuruModem RS-232 WiFi distributed by Arcade Shopper is an advanced wireless communication and storage expansion device. It is designed to bring internet connectivity and modern data management to retro-computing platforms, including the Coleco ADAM and standard ColecoVision.

The Purpose It Serves

The original 1980s ADAMLink 300 Baud Modem relied on traditional analog telephone lines to connect to early Bulletin Board Systems (BBSes). With landlines obsolete and vintage modems limited to crawling speeds, the GuruModem acts as a hardware modem emulator. It bridges the ADAM’s physical serial ports to modern home Wi-Fi networks. This allows users to browse internet-hosted Telnet BBSes, host modern servers, and seamlessly transfer data packets using their classic 8-bit machine.

Hardware & Technical Specifications

The GuruModem is considered the "gold standard" for wireless retro-networking due to its dense, full-featured architecture:

• High-Speed Transfers: It features full hardware modem control and handshaking lines (TX, RX, RTS, CTS, DSR, DTR, DCD, RI). This enables blistering transmission speeds of up to 230.4k Baud—vastly outperforming the original system's 300 baud cap.
• Dual Storage Expansion: The hardware includes an integrated SD Card slot alongside 8MB of onboard flash memory. This provides ample space for a local DOS/Linux-style directory shell or future protocol upgrades like SLIP/PPP.
• Protocol Suites: It natively handles Telnet, FTP, and classic terminal file transfers using XMODEM and ZMODEM protocols.
• Software Configuration: It is completely driverless and configured entirely through an enhanced "AT" command set, meaning there are no physical jumper blocks or micro-switches to configure.
• Visual Indicators & Power: The PCB includes dedicated status LEDs for power, SD Card activity, transmit, and receive. The unit requires an external +5V power adapter via a standard micro-USB cable.

Connecting it to the Coleco ADAM:

Because the GuruModem uses a universal 9-pin or 25-pin RS-232 interface, it cannot plug directly into the ADAM console's native expansion slots without a hardware adapter. To bridge it to the ADAM architecture, users require an intermediary serial interface card, such as:

• The MIB2 Parallel/Serial Interface Card (by Micro Innovations).
• The ADAM-Link Serial Breakout Module.

Once connected via a standard DB9 or DB25 serial cable, owners can boot into terminal software suites like ADAMLink IV or modern CP/M communication packages to instantly access active global retro-BBS arrays.

Availability & Sourcing

• Direct Purchase: You can secure a unit through the Arcade Shopper Classic Computers Store where it typically lists for $70.00, subject to low-volume boutique production batch runs.