Intel PCEM7424 2400EX MNP Class 5 Modem RS-232C External Desktop 2400 Baud

Intel PCEM7424 2400EX MNP Class 5 Modem RS-232C External Desktop 2400 Baud

The Intel PCEM7424 is an external desktop dial-up modem operating at 2400 bps and supporting MNP Class 5 error correction and data compression. It connects to a host computer through a standard RS-232C (DB-25) serial port, making it compatible with virtually any PC of its era that carried a standard COM port. Intel marketed this under their Personal Computer Enhancement (PCE) line, and the 2400EX was one of the more capable consumer modems available at the time of its manufacture in 1990.

Specifications & What's Included

• Manufacturer: Intel Corporation
• Model: Intel 2400EX
• Part Number (MPN): PCEM7424
• Data Rate: 2400 bps (2400 Baud)
• Error Correction / Compression Protocol: MNP Class 5
• Interface: RS-232C standard serial port
• Form Factor: External desktop unit
• Compatible with: Most personal computers equipped with a standard RS-232C port
• Product Line: Intel Personal Computer Enhancement (PCE)
• Manufacture Date: 05/23/1990
• Country of Manufacture: United States
• Includes: Original retail box (open); modem unit appears unused

Applications

The Intel 2400EX belongs to the early-1990s generation of external dial-up modems, produced during the period when 2400 bps was the mainstream standard for PC communications before 9600 bps and V.32 modems became widely affordable. MNP Class 5, developed by Microcom, provided both error correction and up to 2:1 data compression over standard telephone lines, effectively doubling usable throughput under good line conditions — a significant selling point at the time. External modems like this connected to the PC's serial COM port and to a standard RJ-11 telephone jack, operating independently of the host computer's bus, which made them compatible across DOS-based machines, early Windows PCs, Macintosh computers, and other systems carrying an RS-232C port. They were used for bulletin board systems (BBS) access, early online services such as CompuServe and Prodigy, file transfers, and dial-up data communications. This particular unit is of interest to vintage computer collectors, retro computing enthusiasts, and anyone restoring or operating late-1980s to early-1990s PC hardware that requires a period-correct external modem.