Click Here to visit our Sponsor
The Latest News ! The History of Computing The Magazine Have Fun there ! Buy books and goodies
  Click here to loginLogin Click here to print the pagePrinter ViewClick here to send a link to this page to a friendTell a FriendTell us what you think about this pageRate this PageMistake ? You have mr info ? Click here !Add Info     Search     Click here use the advanced search engine
Browse console museumBrowse pong museum


Ready prompt T-shirts!

see details
C64 maze generator T-shirts!

see details
Spiral program T-shirts!

see details
Pixel Deer T-shirts!

see details
BASIC code T-shirts!

see details
Breakout T-shirts!

see details
Shooting gallery T-shirts!

see details
Pixel adventure T-shirts!

see details
Vector ship T-shirts!

see details
Pak Pak Monster T-shirts!

see details


Acorn Computer

The Acorn A4 was the laptop version of the Acorn Archimedes and was one of the first RISC laptops (and by the way, one of the most powerful - five times faster than a 50 MHz 486 for some operations).

The operating system (RISC OS 3.10) was located in the 2 MB ROM. The 9'' LCD screen could only display 14 shades of grey, but used a clever dithering system to make more shades apparent.

The A4 could be used for about 3 hours with its internal batteries.

Rob Kendrick sent us more info :
The case is actually an Olivetti laptop case, with an A5000 in it. Olivetti owned large chunks of Acorn at the time. The main difference between an A5000 (a desktop machine) and a A4 is that the A5000 had a 16MHz memory bus and a 33MHz ARM3.

It had an advanced battery management unit that allows fine-grained control of the clock rate of the CPU (it can drop as low as 2MHz when the computer is idle and go back up to 24MHz when its busy) and the turning off of most of the hardware independently (such as the serial ports, floppy drive, hard drive etc)

The filing system doesn't fragment. At all.

MANUFACTURER  Acorn Computer
TYPE  Portable
ORIGIN  United Kingdom
YEAR  1991
KEYBOARD  84 keys with arrow keys
CPU  ARM 3 (with 4 KB of internal RAM cache)
SPEED  24 mHz (internal CPU) and 12 mHz (bus)
TEXT MODES  Max : 132 x 30
GRAPHIC MODES  47 graphic modes, maximum 640 x 480 with LCD screen and up to 1152 x 896 with VGA screen
COLORS  14 shades of grey (LCD screen)
SOUND  8 voices (stereo 8 bit)
I/O PORTS  VGA, Centronics, RS232 C, stereo sound, Mouse, Keyboard
BUILT IN MEDIA  one 3.5'' disk-drive
OS  RISC OS 3.10
PRICE  £1395 (2Mb floppy version) up to £1895 (4Mb HD120 version)

retro computing t-shirts and goodies
3D Cubes
BASIC code
C64 maze generator
Pak Pak Monster
Pixel adventure
Pixel Deer
Ready prompt
Shooting gallery
Spiral program
Vector ship

Related Ebay auctions in real time - click to buy yours

Click here to go to the top of the page   
Contact us | members | about | donate old-systems | FAQ
OLD-COMPUTERS.COM is hosted by - NYI (New York Internet) -