Bazza
LXF regular
Joined: Sat Mar 21, 2009 11:16 am
Posts: 1392
Location: Loughborough
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 Posted: Thu Apr 22, 2010 7:34 pm Post subject: The MikeOS KB I/O project assembly routines... |
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Hi all...
As promised the assembler code to use a modified KB as I/O
inside MikeOS and running from a netbook... :-O
Notice I have kept these as separate subroutines rather than
a single piece of code which would of course be smaller in
compiled size...
| Code: |
; CAPSLOCK ON/OFF sub-routines for MikeOS.
; Original copyright, (C)2010, B.Walker, G0LCU.
; For use with MikeBASIC and issued as Public Domain.
; CAPSLOCK.ASM, Version 0.00.10, assembly code.
; Assembled under MS-DOS using the AD86 combination.
; The binary is 48 bytes in size.
;CAPSON:
pushf ;Store flags and all of the used
push ax ;registers.
push dx ;
push ds ;
mov dx,0040h ;Point to the SEGMENT to access
mov ds,dx ;the REAL time BYTE KB storage.
mov al,[0017h] ;Move the BYTE value from memory
;into the AL register.
or al,040h ;SET the required bit, (bit 6),
;to a ~1~.
;NOTE, change this value for NUMLOCK!
mov [0017h],al ;Replace the modified byte back
;into the memory location.
int 9 ;Now execute the necessary interrupt.
pop ds ;Restore the registers back to
pop dx ;their original values...
pop ax ;
popf ;And the flags too.
ret ;Return to the calling routine.
;CAPSOFF:
pushf ;Store flags and all of the used
push ax ;registers.
push dx ;
push ds ;
mov dx,0040h ;Point to the SEGMENT to access
mov ds,dx ;the REAL time BYTE KB storage.
mov al,[0017h] ;Move the BYTE value from memory
;into the AL register.
and al,0bfh ;RESET the required bit, (bit 6),
;to a ~0~, keeping all other bits intact.
;NOTE, change this value for NUMLOCK!
mov [0017h],al ;Replace the modified byte back
;into the memory location.
int 9 ;Now execute the necessary interrupt.
pop ds ;Restore the registers back to
pop dx ;their original values...
pop ax ;
popf ;And the flags too.
ret ;Return to the calling routine.
; CAPSLOCK.ASM assembly code end.
; KBFALGS.ASM, Version 0.00.10.
; Keyboard flags memory location in "real time" READ only mode.
; Issued as PD for MikeOS and LXF.
; To work in conjuction with MikeBASIC.
; Keyoard HW modification, (C)2010, B.Walker, G0LCU.
; 8088 CPU instruction set compatible.
; Assembled under MS-DOS using AD86 combination,
;KBFLAGS:
pushf ;Push all used registers
push ax ;and flags.
push dx ;
push ds ;
mov dx,0040h ;Point to the SEGMENT 0x0040h.
mov ds,dx ;Do it.
mov al,[0017h] ;Read the memory offset 0x0017h
;and place into the al register.
pop ds ;Pop these two registers back.
pop dx ;
mov [store],al ;Move the value in the registsr
;~AL~ into a known MikeOS memory
;location.
pop ax ;Now pop the ~AX~ register back
popf ;and the flags.
ret ;Return back to calling routine.
store db 0c3h ;The keyboard flags stored for
;my usage...
; END of flags read routine.
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I have not given an explanation here as this will be part of
the project for MikeOS, but I suspect that there is enough
info inside the code...
For more information Google "segment:offset 0040:0017"...
_________________
73...
Bazza, G0LCU...
Team AMIGA... |
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