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AX = 4B52h ('KR')
BL = function number
00h installation check
Return:
AL = 82h if installed
BH = major version number
BL = minor version number
ES destroyed
01h get driver status
Return:
AL??? = current status (see #02825)
02h set driver state
AL = new driver state (see #02825)
03h blank screen (if blanking enabled when TSR was loaded)
04h unblank screen
4Ch switch to English keyboard mode
90h switch to Russian keyboard mode
Return:
Bitfields for KeyRus driver status:
Bit(s)  Description     (Table 02825)
1-0    language mode.
00 Latin.
01 Russian.
10 Alternative.
11 unused
2      allow character loading (if disabled, use ROM fonts)
3      English keyboard support
7-4    used internally (read-only)
Category: Keyboard Enhancers - Int 2Fh - K

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