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


ZX Spectrum T-shirts!

see details
Ready prompt T-shirts!

see details
Spiral program T-shirts!

see details
Arcade cherry T-shirts!

see details
Atari joystick T-shirts!

see details
Battle Zone T-shirts!

see details
Vectrex ship T-shirts!

see details
Competition Pro Joystick T-shirts!

see details
Elite spaceship t-shirt T-shirts!

see details
Moon Lander T-shirts!

see details
Atari ST bombs T-shirts!

see details
C64 maze generator T-shirts!

see details
Pak Pak Monster T-shirts!

see details
BASIC code T-shirts!

see details
Breakout T-shirts!

see details
Vector ship T-shirts!

see details
Shooting gallery T-shirts!

see details
Pixel adventure T-shirts!

see details

H > HEWLETT PACKARD  > HP-75C / 75D   

Hewlett Packard
HP-75C / 75D

The HP-75C was the first pocket computer ever produced by HP who wanted a pocket book format (10”x 5”) computer as powerful as a desktop. It can also be considered as the first organizer able to deal with a multiple alarms time schedule, to control real time peripherals and to memorize text files.

Its 48KB ROM contained a very complete Basic language and a light version of the spreadsheet Visicalc. Three slots allowed adding pre-programmed ROM modules (Maths, finance, word processor…)

It integrated a card reader. The cards was manually slipped front of the magnetic head. Each card could stock 1.3 KB of information on 2 tracks (650 bytes each). The card information coding allowed great variations of the reading speed, due to manual handling.

The HP-IL (Interface Loop) interface allowed connecting as far as 30 peripherals simultaneously on the HP-75C. Amid the peripherals, one could find a display unit, printers, a modem, a tape recorder and all the HP-IL standard peripherals.
As always with HP, the manuals were very complete and pedagogical.

The HP-75D was released two years later. It added a wand and wand port. When used with the Bar Code ROM, the computer could scan CODE11, CODE39, UPC, and EAN codes. This made the computer useful for inventory control.


I has one (serial $ 78). There was 2 lines on screen.

Monday 14th February 2011
Otto (Brazil)

Hi!. I´m found a HP75C in a trash can!. I´m want to bring it to life again. Do someboy have got an electronic version of its manual?. I will apreciate very much!. /

Friday 11th March 2005
Rodolfo Gil (Venezuela)


NAME  HP-75C / 75D
MANUFACTURER  Hewlett Packard
TYPE  Pocket
YEAR  75C : September 1982
75D: 1984
75D : 1986
BUILT IN LANGUAGE  Basic interpreter, Visicalc spreadsheet
KEYBOARD  64 keys. Each key is user-definable
CPU  8 bits, called Capricorn
RAM  16 KB
ROM  48 KB
TEXT MODES  LCD display. 1 line x 32 chars.
GRAPHIC MODES  160 x 9 pixels
COLORS  Monochrome
SOUND  Beeper
SIZE / WEIGHT  25.4 x 12.7 x 3.2 cm. - Weight 737g.
I/O PORTS  HP-IL, 3 x ROM/RAM expansion ports
BUILT IN MEDIA  Memory cards, 1.3 KB
OS  Specific
POWER SUPPLY  Battery pack or external AC adaptor
PRICE  75C: $995 - 75D: $1095

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) -