Description
Zenith Data Systems ZM-2401 External 2400 Baud Modem ZM2401 RS-232 RJ11C Vintage
The Zenith Data Systems ZM-2401 is an external 2400 baud dial-up modem designed for desktop computers. It connects to a host computer via a DB25 RS-232 serial port and to the telephone network via standard RJ11C, RJ12C, or RJ13C phone jacks. This unit was sourced from military surplus and represents Zenith Data Systems' external modem lineup from the mid-1980s to early 1990s era of personal computing. No AC adapter is included.
Specifications & What's Included
- Manufacturer: Zenith Data Systems
- Model: ZM-2401
- Type: External dial-up modem
- Data Rate: 2400 Baud
- Host Interface: RS-232 via DB25 connector
- Phone Connectors: RJ11C, RJ12C, RJ13C (TO LINE and TO PHONE jacks on rear panel)
- Power Input: 9.5 VAC (barrel jack on rear panel)
- FCC ID: BFJ9D9360V1
- FCC Registration Number: BFJ9D9-14424-DM-E
- Ringer Equivalence Number (REN): 0.8B
- FCC Compliance: Part 15 Class B, Part 68
- Communications Canada certified
- US Patents: 4,549,302; 1,186,080; 1,186,081
- Form Factor: Desktop / external
- Front panel: Zenith Data Systems logo, row of status indicator LEDs
- Included: Modem unit only — no AC adapter
Applications
External 2400 baud modems like the ZM-2401 were standard serial-port peripherals for IBM PC-compatible and Zenith Data Systems computers throughout the mid-1980s and early 1990s. They connected to bulletin board systems (BBS), online services such as CompuServe and GEnie, and early internet dial-up services. The RS-232 DB25 interface made these modems broadly compatible with virtually any PC of the era running terminal software such as ProComm, Telix, or HyperTerminal. Zenith Data Systems was a major supplier of ruggedized and standard computers to the U.S. military and government agencies during this period, and surplus ZM-2401 units frequently trace back to those contracts. Today, these modems are collected as examples of early personal computing hardware and are of interest to vintage computing enthusiasts, computer history collectors, and anyone maintaining legacy serial communication setups.
This Zenith Data Systems ZM-2401 External 2400 Baud Modem has been powered on and tested at our facility. The unit powers on. It was sourced from military surplus. No AC adapter is included — you will need a 9.5V AC power supply to operate it. The unit shows light cosmetic wear consistent with age, including minor yellowing of the plastic casing typical of vintage equipment from this era. All visible connectors appear intact. Please view our photo set and contact us if you have any questions. Please note: We have multiple units in stock — yours may not be the one shown in the photos, however, it will be similar in condition and function.
Warranty Information
Additional Information
Brand: |
Zenith Data Systems |
Model: |
ZM-2401 |
MPN: |
ZM-2401 |
Type: |
External Dial-Up Modem |
SKU: |
8643 |
Data Rate: |
2400 Baud |
Interface Type: |
RS-232 (DB25) |
Connector Type: |
RJ11C, RJ12C, RJ13C, DB25 |
Power Requirements: |
9.5 VAC |
Form Factor: |
Desktop / External |
FCC ID: |
BFJ9D9360V1 |
FCC Registration Number: |
BFJ9D9-14424-DM-E |
Ringer Equivalence Number: |
0.8B |
Standards Compliance: |
FCC Part 15 Class B, FCC Part 68 |
Communications Certification: |
Communications Canada |
Seller Notes: |
No AC adapter included. Unit only. |
Country/Region of Manufacture: |
United States |
Condition Notes: |
Zenith ZM-2401 2400 Baud Modem powers on. Sourced from military surplus. Shows light age-related cosmetic wear and yellowing. No AC adapter included. Please contact us with any questions. |
Condition: |
Used – Pulled from Working Environment |
