These were sufficiently expensive that many people got some form of Spectrum/PC before their first calculator, bang for the buck it made more sense. Then there

These were sufficiently expensive that many people got some form of Spectrum/PC before their first calculator, bang for the buck it made more sense. Then there was a post-soviet wired phone design with Z80 in it which had a built-in calculator among other apps, which it had half dozen. Alarm clock, phone book, etc, etc. The killer feature was Caller ID variant - it could read caller's number from the PSTN and display that one. A feat that required accepting the call and then emulating the beeps.