Click Here to visit our Sponsor
The History of Computing The Magazine Have Fun there ! Buy books and goodies
  Mistake ? 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
ZX Spectrum T-shirts!

see details
Atari joystick T-shirts!

see details
Arcade cherry T-shirts!

see details
Spiral program T-shirts!

see details
Battle Zone T-shirts!

see details
Vectrex ship T-shirts!

see details
Elite spaceship t-shirt T-shirts!

see details
Atari ST bombs T-shirts!

see details
Moon Lander T-shirts!

see details
C64 maze generator T-shirts!

see details
Competition Pro Joystick T-shirts!

see details
Pak Pak Monster T-shirts!

see details
BASIC code T-shirts!

see details
Shooting gallery T-shirts!

see details
Breakout T-shirts!

see details
Vector ship T-shirts!

see details
Pixel adventure T-shirts!

see details



The information we have about this computer is sketchy.
O.S. was a powerful graphical BASIC interpreter modded from the TI basic.
Forth language was also available but not widely used.
Cortex had a mode to give 256 K RAM. ROM was copied into RAM at start-up and then swiched off allowing boot code and basic to be altered at start-up.

Cortex was followed by the Cortex II which was just a re cased version with same style as early apple/dragon 32 beige/yellow plastic sloping cases, but using same main board and disk drives.

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.


I have a Cortex 2, built from old stock kit last year. It''s running complete with the FDC and dual 5.25" drives from a BBC computer. If you have the missing copies of the Cortex user group magazine please visit and let us know.


Friday 4th January 2013
Jim Hearne (UK)

The ETI article for the cortex can be found here$20Cortex
also includes an emulator, Roms etc.

Thursday 4th November 2010
FreeThinker (UK)

HI, I still have my cortex stored in my loft in essex but at the moment it is not working, would love to get it up and going again.

Monday 31st May 2010
david loudfoot (uk)


MANUFACTURER  Powertran Cybernetics
TYPE  Professional Computer
ORIGIN  United Kingdom
YEAR  1983
BUILT IN LANGUAGE  Power Basic and simple assembler/disassember.
KEYBOARD  Full-strok keyboard with numeric keypad
CPU  TMS 9995 (16 bit)
SPEED  3 MHz (12 MHz crystal)
RAM  64 KB
ROM  24 KB
TEXT MODES  40 x 25
GRAPHIC MODES  256 x 192
SOUND  built in speaker with primitive sound function
SIZE / WEIGHT  Unknown
I/O PORTS  Serial RS-232C, Tape recorder port, optional Parallel printer card made by the Cortex User Group, Ebus extension bus that would take cards from the TI990 series minicomputer.
BUILT IN MEDIA  Optional 5.25'' FDD (worked off a TMS9909 FDC. The Basic included a 'Boot' command which would boot the disk.)
PRICE  £249 + vat (later £199 + vat) for a kit of self assemby parts. Construction details in 'Electronics today international' magazine

Please buy a t-shirt to support us !
Ready prompt
ZX Spectrum
Arcade cherry
Spiral program
Atari joystick
Battle Zone
Vectrex ship
C64 maze generator
Moon Lander
Competition Pro Joystick
Atari ST bombs
Elite spaceship t-shirt
Commodore 64 prompt
Pak Pak Monster
Pixel Deer
BASIC code
Shooting gallery
3D Cubes
Pixel adventure
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) -