Hello
You need to test two thing.
First, value of R44 need change from 2K to 1K.
https://zx-pk.ru/threads/29446-galaksiya-(plyus)-sborka-i-nastrojka.html?p=978096&viewfull=1#post978096Second, due of simplicity and small size of SDOS, format FAT16, witch produces Windows, may bee not recognized. So, as
fifan said before, you need right format SD card.
I format it in Linux, and SDOS recognized it ok. Or you may format it in old photo camera.
Of course it is possible to write raw disk image for
emu to SD.
Under Linux "dd if=./SD4.mmc of=/dev/sd
X".
In this case you SD will have right FAT16 format and all program for Galaxy in one action.
In Windows it can also be done, but I do not know the names of the programs for this.
But, first of all, you need to see "SD_V1 or SD_V2 or SD_V2+ (this is SDHC card)" next line after line SDOS_V8.6, (look:
viewtopic.php?f=71&t=9407&start=150#p145047) and it doesn't matter if your card have correct FAT16 or not.
So try change R44 first and check all around it.