Олимпик С (Olympic S): Part 1 (A Ukrainian Speccy Clone)
16First look at this Ukrainian version of the ZX Spectrum built in 1995 ... the Olympic (or Olimpic) S.
{TL;DW ... it's not working at the moment.}
The manual is available - I've scanned and uploaded it here:
https://archive.org/details/olympic-s-manual-svitlovodsk-ukraine
It includes the usual 5-pin DIN sockets: power (БП), joystick (ДЖ), RGB (ЦТВ), cassette (МГ) and one 2x32 pin expansion port (СШ). There is a blank plate where a 2nd expansion port is possible.
I checked the power input first - the manual seems to mention only +5VDC at 1.5A, however when I checked the actual pinout:
Pin 1 = ground
Pin 2 = ground
Pin 3 = +5VDC
Pin 4 = +12VDC
Pin 5 = +5VDC
I can't see that the +12V is used anywhere but on the expansion bus (per the manual).
On initial boot I got a corrupted screen ... DRAM issue?
The DRAM looks to be eight КР565РУ5Г (KR565RU5G) 64kbit (64k x 1bit) DRAM.
There are two EPROMs on board: КР573РФ60Б (KR573RF60B) - couldn't find any info after a quick search, assuming they're 8KB each (2764 equivalents).
{Thanks to Serge & Дімон from the Z80 Homebrew Facebook group for the extra info}
Finally, the Z80 appears to be an Eastern Bloc clone, using Soviet 2.5mm pin spacing instead of "imperialist running dog" spacing of 0.1" (2.54mm) ... feedback I got was that it is also of Ukrainian origin, made in Світлово́дськ (Svitlovodsk, where the machine itself was made) by КНИИМП ... Киевский Научно-Исследовательский Институт МикроПриборов (Kyiv Research Institute of MicroDevices).
Oh, about the one Rouble coin - got it during one of my frequent trips to Estonia back in the early 2000s. Yes, I know ... it's celebrating the 100 year anniversary of Lenin's birth, 1870 to 1970.
#ZXSpectrum