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H > HOLBORN > 9100   


The Holborn System 9100/9200 computer was a Dutch product ("born in Holland") consisting of a science-fiction style desk-top display/keyboard unit, a processor box with two or four 8" floppy drives and a printer. The processor was a Z80 with 64 KB of address space.

There were two versions : the larger one used a proprietary multi-user operating system, one feature of which was the use of a lightpen for much the same purposes as today's mouse. The smaller machine used CP/M without lightpen interaction. The computer was mainly sold to small companies for administration and bookkeeping purposes.

The machine's hardware was designed by H.A. Polak, the console by Vos Industrial Designers. The disks and the system electronics were in a separate refrigator-sized housing (a desktop box for the smaller system); the console shown in the picture mainly contains a converted MicroBee terminal.

The Holborn company was founded in 1979, it's head office was in Holten (Hol born). The company has been active until 1983, when it bankrupted. Like most manufacturers of computer systems of original design around the world, it hasn't survived the competition of IBM and the IBM-PC-clone builders. About 200 machines were sold, 50 of them of the larger variety.

Thanks to the Computer museum of the University of Amsterdam for text and pictures.

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.
Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).

Friday 26th August 2022
Jak Boumans (Netherlands)

The info text states that the Holborn 9100 had 64k ram and needed to use bank switching,this is not true because 64k ram is the maximum amount of memory that an 8 bit proccessor can access.

Saturday 27th February 2021
Neil macPherson (UK)

The monitor design looks like something coming out from an early 1970s sci-fi movie. It''s kind of scary for me.

Monday 2nd December 2019


NAME  9100
TYPE  Professional Computer
ORIGIN  Netherlands
YEAR  1981
KEYBOARD  Full-stroke keyboard with numeric keypad and function keys
CPU  Z80-A
SPEED  4 Mhz.
RAM  72 KB expandable to 220 KB
ROM  unknown
TEXT MODES  unknown
COLORS  Monochrome
SOUND  unknown
BUILT IN MEDIA  2 x 8'' 1.2 MB floppy disc drives. Optional 30 MB hard disk
OS  Holborn OS or CP/M
POWER SUPPLY  Built-in power supply unit
PRICE  About $10,000 for a full-sized version

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