Mask: $E003
$8000: Select 8 KiB PRG-ROM bank at CPU $8000-$9FFF
$8001: Select 8 KiB PRG-ROM bank at CPU $A000-$BFFF
$8002: Select 8 KiB PRG-ROM bank at CPU $C000-$DFFF
$8003: Select 8 KiB PRG-ROM bank at CPU $E000-$FFFF. Written value is ORed with $01.
CHR-RAM Bank Select ($A000-$BFFF, write)
Mask: $E007
$A000: Select 1 KiB CHR-RAM bank at PPU $0000-$03FF
$A001: Select 1 KiB CHR-RAM bank at PPU $0400-$07FF
$A002: Select 1 KiB CHR-RAM bank at PPU $0800-$0BFF
$A003: Select 1 KiB CHR-RAM bank at PPU $0C00-$0FFF
$A004: Select 1 KiB CHR-RAM bank at PPU $1000-$13FF
$A005: Select 1 KiB CHR-RAM bank at PPU $1400-$17FF
$A006: Select 1 KiB CHR-RAM bank at PPU $1800-$1BFF
$A007: Select 1 KiB CHR-RAM bank at PPU $1C00-$1FFF
The text editor writes every byte to be printed both to $4900 and $4901.
Note
The Arabic version of the Asder PC-95 Educational Computer most likely originally used this mapper as well. The publicly-available ROM image has obviously been hacked for iNES Mapper 241 and crashes at several points.
The Korean version uses different hardware and adds a speech chip, which are described by NES 2.0 Mapper 531.