The KR580VM1 (or КР580ВМ1) is a CPU from Soviet Ukraine that is not directly equivalent to any Western ones. It's basically an Intel 8080 with another register pair, H1L1, and another address space which can contain data but not executable code. Instruction prefixes control the use of H1L1 and the second address space.
Sounds like a great product, right?
The thing is I cannot find any evidence that this chip was ever used anywhere by anyone. Maybe the Z80 clones plus bank switching mechanisms eclipsed the KR580VM1's usefulness. Maybe it was used only in embedded applications that nobody writes about today. So my question is if this CPU actually was used in any products