BBC Model ???

BBC - 01
The Acorn BBC model A is the successor of the Acorn Atom and its first
name was Acorn Proton.
It was a very popular computer in UK and was widely used in school,
but it didn't have a great success elsewhere (even if it has great
characteristics, it was too expensive). 

The Model A doesn't have some of the connectors of the Model B/B+
(User port, Tube, ...) on the underside. 

This computer got it's name because, in 1980, the BBC decided to start a
computer literacy television series.
The network realized that, with more powerful and increasingly inexpensive
microcomputers, it would soon be possible to create them with enough
computing power to offer their owners personal hands-on experience with
microcomputers at an affordable price. 
The BBC considered the NewBrain computer and rejected it.
Acorn and Sinclair Research, along with other companies, then submitted
designs, and the Acorn won.
The BBC model B was then almost universally used in British schools from
it's birth into the 90's. 

It was followed in 1982 by the Acorn BBC model B, the Model B had the same
characteristics but had 32 KB RAM (up to 64k). 

The "Tube" is an expansion port which was designed to connect other
processors to the BBC (6502, Z80, 68000 or ARM 1 RISC).
An interface was designed for the tube and used an other 6502 and a Z80. 

One of its most popular extension was the "Torch" floppy disk unit,
it was a 5.25" floppy disk drive with a Z80 which allowed the BBC to
use CP/M softwares. 

Acorn made a "cheap" version of the BBC (fewer connectors & video modes)
called Acorn Electron. 

In 1985, the Acorn BBC Model B+ is released.
The Model B+ has new features : 64k of RAM instead of 32 KB, it has
internal circuitry for the Econet and Disk Drive as standard, they were
both available as an upgrade in the models A and B.
The later models included disk support as standard, using either and 
8271 or 1770 disk controller. 

It was followed by the BBC Master. 


Manufacturer Acorn Computer Name BBC
Type Home Computer Origine UK
Introduction Date 1981 End of production ???
Built in Language BBC Basic Keyboard Full-stroke QWERTY keyboard, 64 keys, 10 function keys, arrow keys
CPU MOS 6502 Speed 1.8 Mhz
Coprocessor custom ULA Amount of Ram Model 1 : 16 kb, Model B : 32 kb, Model B+ : 64 kb
Vram ??? Rom 32 Kb
Text Modes 80 x 32/25 (2 colors) / 40 x 32/25 (2 or 4 colors) / 20 x 32 (16 colors) / 40 x 25 (Teletext display) Graphic Modes 640 x 256 (2 colors) / 320 x 256 (4 colors) / 160 x 256 (16 colors)
Colors 16 (8 colors + flashing option) Sound 3 channels, 7 octaves
Size / Weight 41 x 34.5 x 6.5 cm Built in Media None
I/O Ports UHF TV out, BNC video out, RGB vide out, RS423, Cassette, Analogue In (DB15), Econet port, TUBE interface, 1Mhz BUS, User port, Printer port, Disk-drive connector OS ???
Power Supply Internal Introduction Price 1181 (France, february 84)
Sold ??? Serial Number ???
Other Extras ??? Bought Where Assebroek
Bought When 23/01/2003 Condition Working
Price Paid 31.50 Specs of my Model -
Setup Today ???

Back Bottom


Bought on ebay (20/01/03 collected it on 23/01/03).
Paid 31.50

Also collected the Philips NMS8550_02 (62), which was bought from
the same guy (also Ebay).