Wygląda jak moduł z centrali telefonicznej i to pewnie coś w tym temacie, bo ma wybity swój numer świadectwa homologacji.
Złącze może być mechanicznie jak ISA, ale w praktyce nie mieć z nim nic wspólnego i obstawiam, że tak właśnie jest w tym przypadku.
To coś wygląda jak główny moduł (karta CPU) jakiejś starej centrali.
Z opisu na https://en.wikipedia.org/wiki/Zilog_Z80 wynika, że ta karta mogła mieć zastosowanie telekomunikacyjne
RS-232 multiplexers connecting large numbers of old style "terminals" to minicomputers or mainframes used arrays of Z80 CPU/SIO boards.
Z80/Z180/Z380 have been used in telecommunication equipment such as telephone switches and various kinds of modems.
Na tej karcie może być odpowiednik RS oraz port równoległy. Jest na niej również Z80 SIO
Kolejna ciekawostka Układ UA-857D jest funkcjonalnym odpowiednikiem Z-80A . Prawdopodonie były trudności ze zdobyciem oryginalnej wersji i zastosowano zamiennik.
http://www.sklep.monster.pl/m/Z-80A-CTC-UKLAD-UA-857D(4,36989,35445).aspx
Industry
The IBM PC-XT's hard drive controller, which was actually an IBM adaptation of the Xebec 1410 SASI controller, but on a PC-XT bus, not a SASI bus.
Office equipment such as matrix printers, fax machines, answering machines, and photocopiers are known examples.
Industrial programmable logic controllers (PLCs) use the Z80 in CPU modules, for auxiliary functions such as analog I/O, or in communication modules.
It has also been employed in robots, for example for speech recognition[71] and low level tasks such as servo processors in pick and place machines.
RS-232 multiplexers connecting large numbers of old style "terminals" to minicomputers or mainframes used arrays of Z80 CPU/SIO boards.
Applications such as TV broadcast vision mixers have used the Z80 for embedded real time subtasks.
It has also been used in Seagate Technology's and other manufacturers' hard disks.
Credit card consoles controlling fuel pumps used Z80 CPU and PIOs (US patents 4930665, 4962462 and 5602745).
Retail industry point-of-sale credit card terminals manufactured by VeriFone used the Z80 processor.
Several PC expansion cards, such as Adaptecs SCSI boards, have been using the Z80/Z180 and peripheral chips.
Z80/Z180/Z380 have been used in telecommunication equipment such as telephone switches and various kinds of modems.
The Stofor message switch, used extensively by banks and brokers in the UK was Z80 based.
Cash registers and store management systems
Home automation, wireless sprinkler control and wireless mesh using the N8VEM open source homebrew system.
Breathalyzer equipment used by law enforcement agencies.