These seems to be the paging methods used by russian clones:
Source
Pentagon 512 kB
port 7FFD: (adressation 0xxxxxxx xxxxxx0x )
D0 = bank 0 ;128 kB memory
D1 = bank 1 ;128 kB memory
D2 = bank 2 ;128 kB memory
D3 = videoram
D4 = rom
D5 = disable paging
D6 = bank 3 ;256 kB memory
D7 = bank 4 ;512 kB memory
Pentagon 1024 kB
port 7FFD: (adressation 01xxxxxx xxxxxx0x )
D0 = bank 0 ;128 kB memory
D1 = bank 1 ;128 kB memory
D2 = bank 2 ;128 kB memory
D3 = videoram
D4 = rom
D5 = bank 5 ;1024 kB memory (if D2 of port EFF7=0)
D6 = bank 3 ;256 kB memory
D7 = bank 4 ;512 kB memory
port EFF7: (adressation 1110xxxx xxxx0xxx )
D2 = 1 - set 128 kB mode
0 - enable 1MB memory
(if D2 of port EFF7=1 then D5 of port 7FFD is used for disable paging)
D3 = 1 - disable rom and connect ram page 0 in adress space 0-3FFF
Scorpion 256 kB
port 7FFD: (adressation - 01xxxxxx xx1xxx01 )
(adressation in REALSPECTRUM emul is also different ) :v2_wacko:
D0 = bank 0 ;128 kB memory
D1 = bank 1 ;128 kB memory
D2 = bank 2 ;128 kB memory
D3 = videoram
D4 = rom
D5 = disable paging
D6 = unused
D7 = unused
port 1FFD: (adressation - 00xxxxxx xx1xxx01 )
D0 = 1 - disable rom and connect ram page 0 in adress space 0-3FFF :v2_conf3:
(UNREAL SPECCY emulator set after OUT 1FFD,1 ram page 0 to low 16kB, but REALSPECTRUM emulator set ram page 8 to low 16kB :v2_jawdr: )
D4 = bank 3 ;256 kB memory
D6 = unused
D7 = unused
Scorpion 1024 kB
port 7FFD: (adressation - 01xxxxxx xx1xxx01 )
(adressation in REALSPECTRUM emul is also different ) :v2_wacko:
D0 = bank 0 ;128 kB memory
D1 = bank 1 ;128 kB memory
D2 = bank 2 ;128 kB memory
D3 = videoram
D4 = rom
D5 = disable paging
D6 = unused
D7 = unused
port 1FFD: (adressation - 00xxxxxx xx1xxx01 )
D0 = 1 - disable rom and connect ram page 0 in adress space 0-3FFF
D4 = bank 3 ;256 kB memory
D6 = bank 4 ;512 kB memory
D7 = bank 5 ;1024 kB memory