---
title: Ice-Felix M18 series
categories:
- Computers
types:
- Professional Computer
origins:
- Romania
years:
- '1975'
cpus:
- East Européan version of the Intel 8080
params:
  name: M18 series
  image: /media/museum/photos/icefelix_m18_system_s1.jpg
  company: /companies/ice-felix
  company_name: Ice-Felix
  specs:
  - label: NAME
    value: M18 series
  - label: MANUFACTURER
    value: Ice-Felix
  - label: TYPE
    value: Professional Computer
  - label: ORIGIN
    value: Romania
  - label: YEAR
    value: '1975'
  - label: END OF PRODUCTION
    value: '1981'
  - label: BUILT IN LANGUAGE
    value: None
  - label: KEYBOARD
    value: Depending on the video terminal used
  - label: CPU
    value: East Européan version of the Intel 8080
  - label: SPEED
    value: Unknown
  - label: RAM
    value: 64 KB
  - label: ROM
    value: Unknown
  - label: TEXT MODES
    value: Depending on the video terminal used, mostly 80 x 25
  - label: GRAPHIC MODES
    value: None
  - label: COLORS
    value: Monochrome
  - label: SOUND
    value: Unknown
  - label: I/O PORTS
    value: Parallel and Seriel
  - label: BUILT IN MEDIA
    value: Magnetic tapes or punch cards
  - label: OS
    value: M18-ROS and enhanced versions, later CP/M
  - label: PERIPHERALS
    value: Serial printer, paper tape and card reader-puncher, magnetic tape drive,
  - label: PRICE
    value: Unknown
  tabs:
  - photos
  forum_thread: 995
  photos:
  - title: MAIN UNIT
    subtitle: ''
    text: The main unit rack holds the system bus ans all the interconnected modules.
    image: /media/museum/photos/icefelix_m18_opened_s1.jpg
  - title: BROCHURE
    subtitle: ''
    text: This picture seems to come from an ICE Felix brochure.
    image: /media/museum/photos/icefelix_m18_brochure_s1.jpg
  oc_id: 1021
  source:
    url: https://web.archive.org/web/20221127081650/http://www.old-computers.com/museum/computer.asp?c=1021
    date: '2022-11-27'
---

The Felix M18 business computers family was composed of three members, the **M18**, **M18B** and **M118GS**. They were designed and manufactured in Romania between 1975 and 1981, using the Intel 8080 processor.

The M18 series had a modular structure composed of master and slave modules, interconnected through a common bus. The MASTER-UCB module contained the 8080 microprocessor, an 8 KB EPROM memory, the 8224 clock circuit, the 8228 local bus command circuit and the 8259 interrupt circuit.

An example of slave module was the printer / card puncher-reader port, wich didn't access the system's bus.

The first M18 contained the URS-80.00 main unit and 4 cards (CPU, SYU, PF, EBUS) for EPROM and RAM memory, and the necessary interfaces to connect the following peripherals: console, paper tape reader/puncher, serial printer, punched cards reader, magnetic tape drive and magnetic casette drive.

The Felix M18B had improved modules. The main UCB unit had the memory resources and the interrupts system on a single card. The 32 KB RAM module also was on a single card.

The systems could run three base software packs:\
1 - **M18-ROS**, Resident Operating System,\
2 - **M18-TOS**, Operating system oriented on punched paper tapes and magnetic tapes,\
3 - **SFDX18**, an enhanced version of the M18-ROS and M18-TOS wich contained a monitor (MON18 V1.3), the command interpretor, an I/O subsystem, a supervisor (editor, libraries, linker), and various languages: ASM80 macroassembler, PLM80, FORTRAN80, COBOL80, BASIC, PASCAL80.

The CP/M OS was adapted later, as well as a cross-software pack (M18-CSP) allowing software to be written and simulated on the Felix C-256 family before being transferred to a M18 system through punch cards or magnetic tapes.

The M18 series was manufactured in large series and also sold beyond Romania.\
The Central Informatic research Institute of Romania (ICI) also wrote a succesful real-time OS for the M18, as well as an Ethernet-like local network called CAMELEON.

Thanks to **Stefan Deli** from Romania for information and pictures.