Holborn 6140 desktop computer
UvA Computer Museum catalogue nr 99.02
This computer is a Dutch product ("Holborn = born in
Holland"), consisting of a science-fiction style
display/keyboard unit, a processor box with two 8" floppy
drives, and a printer. The processor is a Z80 with 64k of address
space, using a bank-switching memory management system.
The machine's hardware was
designed by H.A. Polak, the console by Vos Industrial Designers.
Inside, the console unit is in fact an adapted MicroBee terminal.
The Holborn 6140 runs under CP/M.
(A different model, with a proprietary multi-user operating system, featured a lightpen, as shown in the picture). The Holborn computers
were mainly sold to small companies for administration and
bookkeeping purposes. Our machine has been used in a university department library.
- processor Zilog Z80A, 4 MHz
- internal memory 72 k standard, expandable to 220 k
- background memory 2.5 MB on two 8" diskettes, more diskettes or 30 MB harddisk optional
- operating system Holborn OS or CP/M
The Holborn company has been active only from 1980 to 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. The price of the full-featured Holborn was
about Dfl 30,000 or US$ 10,000 (at the exchange rate of the time).
Our Holborn 6140 computer was donated by Mr. H.
Seijlhouwer, Historisch Documentatiecentrum voor het Nederlands
Protestantisme, Vrije Universiteit, Amsterdam.