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C > CASIO  > PB-300   


Basically, the PB-300 was a PB-100 with more RAM and a built-in thermal printer. To our knowledge, Casio was the only company who designed real pocket size computers with integrated printers.

Of course, the PB-300 was substantially larger than its elder brother, therefore the keyboard could be laid out more generously, with a real space bar and an additional key for paper feed.

Due to the different physical dimensions, the main PCB had a different layout. However, the logic circuits were identical to the PB-100, with an additional HD61914 RAM chip. No further RAM expansion was made available.

As printers needed much more energy than the computer components, a 4 x 1.2V NiCad battery pack had to be integrated, which needed to be charged with an external power adaptor. The necessary printer and battery charging circuits were built onto a second PCB.

The printer used thermal paper of 39 mm width and was able to print 20 characters per line, making printed listings a little bit more legible than on the 12-character display.

To sum up, the PB-300 was a really cute machine. Imagine taking it with you in 1983 and impressing your friends by printing business cards when needed.

The PB-300 was also sold in Europe under the name Olympia OP-644.

Thanks to Roman von Wartburg ( for information and pictures.

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


I want a Casio PB-300. My uncle had one and I broke it as a kid. I want to surprise him! I can pay about $50 or so. Write to me at 4dylansmart at Google dot com

Saturday 16th March 2013
Dylan (USA)

i have two for sale, one turns on, one doesnt

Sunday 23rd September 2012
freddy (us)

I would like to buy a Casio PB-300 so I can sit at home and remember the early days. Anybody have one I can buy?

Tuesday 18th September 2012
Carl (United States)


NAME  PB-300
TYPE  Pocket
YEAR  1983
KEYBOARD  QWERTY calculator type 54 keys with numeric keypad
SPEED  455 kHz, ceramic resonator used as system clock
RAM  2 KB (1568 bytes for BASIC)
ROM  12 KB
TEXT MODES  1 line x 12 chars plus a 4 digit seven segment display part
COLORS  Monochrome LCD
SIZE / WEIGHT  173 (W) x 90 (D) x 20 (H) mm / 258 g (with batteries)
I/O PORTS  12-pin expansion port for cassette interface
POWER SUPPLY  2 x CR-2032 lithium batteries
Integrated NiCd batteries for printer. External charger CHA-1 (4.8V/4.1W)
PERIPHERALS  FA-3 cassette interface
PRICE  Unknown

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