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How did the 1802 call and return instructions work?

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Clash Royale CLAN TAG #URR8PPP up vote 3 down vote favorite The RCA 1802 processor was used in a number of systems such as the ELF and COMX-35, and also apparently in the US space program (with its hardened variant). From memory, it had a rather unusual set of instructions for doing function calls and returns. Can anyone detail how this actually worked in practice? rca-1802 share | improve this question asked 3 hours ago paxdiablo 286 2 13 add a comment  |  up vote 3 down vote favorite The RCA 1802 processor was used in a number of systems such as the ELF and COMX-35, and also apparently in the US space program (with its hardened variant). From memory, it had a rather unusual set of instructions for doing function calls and returns. Can anyone detail how this actually worked in practice? rca-1802 share | improve this question asked 3 hours ago paxdiablo 286 2 13 add a com...

Pairs of words differing only by a soft sign

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Clash Royale CLAN TAG #URR8PPP up vote 1 down vote favorite When I was taking my one (weak) Russian course years ago, I ran across an MP3 with sample sounds. The pair that got me very worried was Борис vs Борись. At the time, I could hear only the vaguest difference between those sounds, much less be able to reliably speak them. Recently I was wondering how common it is in Russian that two words differ only by a soft sign. Is that rare, not uncommon, or happens all the time? Is there any list of words like this somewhere? I was thinking of developing a list and saying one of the pair to a native speaker and asking them which one I said, and having them say a random choice and me telling them what I heard. I remember reading a...