There is the ROMs, and what I'm already discovered:
You can found a "fake" 2.2 versions of EXOS, BASIC and EXDOS. The main modification on these: all messages converted to upper case.
Then these are displayed right also in cyrillic mode.
EXOS: the version number only modified at the memory test screen.
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See the ASMON screen, the system report version 2.1
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Because the modifications the ROM CRC are wrong. Instead calculate the right CRC the CRC check routine removed.
If external memory test run with these EXOS roms, INTERNAL CHECKSUM ERROR detected and system halted.
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Another byte modified in the EXOS:
;PRE VER COPYRIGHT CHECKING
;SEGMENT 00
; EXOS 2.1 EXOS 2.2
;0181 031H 032H
;019C 0C9H SCHOLL NO YET 089H,08AH
At the first character of "INTERNAL CHECKSUM ERROR" message stored the school number.
You can see this in the error screen.
This number byte the reason for the strange EXOS137 and EXOS138 filenames.
Error messages don't modified in EXOS, because these are stored in compressed format.
BASIC: version number in the HELP list modified. But I think if we ask the version number with BASIC system call then it is still report 2.1...
Copyright modified for 1989 Enterprise Computers GmbH
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Some texts which are in this ROM are upper cased, for example the OK message or the "bytes in system".
But the BASIC error messages still original, because these are in the EXOS ROM Segment 01h, and also in compressed format...
EXDOS: its a hacked 1.3 version, English messages are upper cased. Copyright changed to 1989 EC GmbH
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Cyrillic ROM: the first and big surprise for me the starting screen! It is a variant of the 'a' Studió Enterprise Plus cartridge!
For the comparision I also made screen shoots with the Plus ROM.
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At the start the CIRIL ROM is check the modified bytes in the EXOS ROM. If these not right then come the GAME OVER screen
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Compare the HELP list of the CIRIL and PLUS, the PLUS have more functions, but the CIRIL HELPs little more detailed.
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Both expansion include WP. This is very interesting point!
The Plus don't include in the HELP list, and not autostarted (if no other ROM started), only started with WP command.
The CIRIL are list as WP 2.2, and it is can be autostarted. The copyright also are 1989 EC GmbH.
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The big surprise when it is started! It is the Super WP! Just all text upper cased.
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But in the PLUS ROM, the WP looks same with the original 2.1 version. Only in the Status line write it is a WP PLUS. And the upper screen are strange: it is widder than the original, like in the Super WP.
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I can't find any functional difference in this version from the 2.1...
There is the most strange thing: the Plus Cartridge User Manual are talking about: new better WP, with printer functions included in the Plus ROM. But we not found the better functions...
But this is right for the Super WP, which is included in the CIRIL ROM! Very strange why it is missing from the Plus!
Back to the HELP list: the CIRIL ROM are illegally close the HELP list, for avoid the WP 2.1 displayed. This make other problem: in the complete Cyrillic cartridge (what we see on the photo) included another EPROM with the ZZZIP BASIC compiler.
But because the HELP list illegally closed, the ZZZIP don't displayed. For solve this problem HELP items added fot ZZZIP in the CIRIL ROM. Strange solution...