ISDOS is stored on disk and is some kind of bridge between IS-BASIC and EXDOS.

No, it is not a "bridge", but a CP/M.
ISDOS is originally released on disk, which is a CP/M.
Later, ISDOS is contained in ROM, which was included in unofficially EXDOS versions (32k ROM).

I didn't have a disk drive when I owned an Enterprise, so I'm a little confused about the differences between EXOS, EXDOS and ISDOS.

I'm currently exploring the possibility of adding Enterprise support to the ACK compiler, so I need at least a basic understanding of all three before going any further.

From what I can gather, EXOS is stored on ROM and is available on all Enterprise machines. It handles video, audio, tape loading/saving, i/o etc. and can be accessed from IS-BASIC or machine code.

EXDOS is stored on ROM on Enterprise disk drives and handles disk control, a little like MS-DOS.

ISDOS is stored on disk and is some kind of bridge between IS-BASIC and EXDOS.

CP/M and MSX-DOS also seem to be supported, but I'm not sure how or to what extent.

Do I have any of this right? Do I have anything wrong or something missing?

EXOS 2.1 esetén:
m bfcc
eredménye:
>BFCC  00 00 FF 03 1E 00 00 00  :........
majd az első 0-át írd át nem 00-ra, és enter

EXOS 2.0 esetén:
m BFD0
eredményét nem néztem meg
és itt is az első 0-át írd át nem 00-ra, és enter

Cool
I think text on those screens should be translated also, i will share that part of the source with you, as i remember it contains all other needed texts.

I finish translating dialogs.
I miss only chapter names, NPC names.
And what about next screens?

I can leave some latin letters in font for hotkeys (RLP) and password letters (ABCDEF). Because some cyrillic capital letters didn't use in dialogs. But I didn't know what to do with credits screen.

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Seems PenText.exe give me good size of compressed texts:

PenText V.0.6
Text Compressor for z80
Coded by Luis I. Garcia a.k.a. Benway (garvelu@yahoo.es)
Released under GPLv3 license (http://www.gnu.org/licenses/gpl-3.0.html)

Loaded out.txt: 20090 bytes (271 strings found).
Longest string has 243 bytes.
Creating compression table...
Customized compression table saved: out.txt.5tt
Header file out.txt.asm generated.
Generated 271 files: 13563 bytes. (1:0.675 ratio)