Here's an old article (german language) from 2013 where I write about me building a DIY tape interface for the Sharp Pocket PC 14xx and 12xx series. This was the time when I started to tinker with electronics. (Article Link:

The schematic (courtesy of M. Nosswitz) can still be found at the Pocket Computer Museum (, but I add it here for the sake of completeness.


@Wintermute_BBS so you can read and write data from tape to your calculator? 🤯 Did you, like, write programs for that thing?

@asciijungle These "Pocket Computers" were real BASIC programmable computers. Not just calculators!

They featured up to 16KB RAM (on later models). Hence the tape drive for program and data storage. There were also printer interfaces and combo printer-tape interfaces provided by Sharp.

Casio and Epson also built those small BASIC programmable handhelds, but Sharp owned the brand name "Pocket PC"

Good Morning Everyone!

Yesterday I posted a photo of my DIY Sharp "Pocket PC 14xx/12xx" tape interface. Today I share with you this photo of the "Pocket PC" 1403 I used in the shots.

It seems that these little handhelds which were the leading edge of true, battery powered mobile computing in the early 1980s don't seem to get much love from the retro scene (execpt for maybe the Grundy "NewBrain").

And this is how you code simple BASIC programs. BASIC keywords are available through ZX Spectrum like shortcuts, e.g. instead of typing in the whole PRINT command you would simply press <SHIFT>+<P>.

@asciijungle by today's standards: yes. by early 1980s standards: enough to write small BASIC routines to do complex calculations.

@Wintermute_BBS oh yes, I used a Sharp 12?? (don't remember model) 30 years ago when all my friends had TI 57ii or Casio Fx-180P

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