Elektronika MK-52: The MK-61 big brother?

[jhl]

(02-11-2015 12:47 AM)Den Belillo (Martinez Ca.) Wrote:  Can you call them up to function as subroutines for your own programs in main memory?

They're accessed the same as the EEPROM, so unfortunately not. I gather there was a switch on them to switch between expansion ROM and internal EEPROM.

As far as the other port goes: despite rumours about a printer, and external expansion controllers ("ВЗУ") with things like RAM, the definitive quote seems to be "Дополнительный разъем установлен с технологической целью и служит для диагностики изделия в процессе его изготовления." -- which says it's a diagnostic connector only. I suppose those EEPROMs might have been a bit finicky, given that they need more than 30 volts to take a write...

The port would be suitable for an externally controlled printer (ie. it could read all the registers and decide what to print), but it doesn't appear to have any way to disable the DD7 and so couldn't provide data to the calculator.