If I understand you correctly, then JEMM386, but not JEMMEX,
clears the ext keyboard flag at 40:96, but should not. Have
you tested whether this depends on which options you use when
loading JEMM386?
The JEMM386 source code (some old version I had around) has
the following in JEMM32.ASM which might be relevant, as part
of the int 15, function 4f handler for scancode 53 (DEL)...
and word ptr ds:[@KB_FLAG],not 01100001100b ;reset Ctrl+Alt status
and byte ptr ds:[496h],not 1111b ;reset Ctrl,Alt,E0,E1
status
RBIL says:
MEM 0040h:0096h - KEYBOARD STATUS BYTE 1
Size: BYTE
SeeAlso: MEM 0040h:0097h,INT 16/AH=11h
Bitfields for keyboard status byte 1:
Bit(s) Description (Table M0033)
7 =1 read-ID in progress
6 =1 last code read was first of two ID codes
5 =1 force Num Lock if read-ID and enhanced keyboard
4 =1 enhanced keyboard installed
3 =1 Right Alt pressed
2 =1 Right Ctrl pressed
1 =1 last code read was E0h
0 =1 last code read was E1h
So in theory, this write access to 40:96 should not affect
the enhanced keyboard installed flag. Maybe the version of
JEMM386 used by Willi implements this part in a broken way?
Regards, Eric
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