Miniware M4000
This page was last modified 14:22, 13 January 2022 by Mars2000you. Based on work by Gdx.


The Miniware M4000 is a modem that was sold only in the Netherlands. It can operate at different speeds

  • CCITT V21 - 300 BAUD Bi-Direction
  • CCITT V23 - 1200 BAUD receive, 75 BAUD send

It can handle

  • Videotex / TTY modes
  • File transfer
  • Auto-dialing / Auto-answer

It seems to be a pre-version of the Philips NMS 1250 and NMS 1255 modems, actually manufactured by Miniware.

Without modification, this modem can indeed work only with a few computers, especially the VG-8235/20, NMS 8245 and the Panasonic Turbo R machines. These computers don't have a system of two buffers (IN and OUT) to protect sensitive components from short circuits during data transmission.

Computers such as the Philips NMS 8250, NMS 8255, NMS 8280 and Sony HB-F700P have these buffers and you need to modify the modem to make it correctly handle the busdir signal.

The original floppy disk provided with this modem contained a program that was not designed for MSX computers, it was therefore replaced by several MSX communication programs.

Brand Miniware
Model M4000
Year 1987, sold only in 1992
Region The Netherlands
Launch price NL: ƒ59
Package content Modem cartridge
3.5" single-sided disk
Instruction manual


Miniware M4000 PCB