🚀 go-pugleaf

> For that matter, any info on how to compile/link to a .sys file

  This is how one of my old and simple dos device drivers look,
I hope it will help you:


;*********************************************************
;*                    NUMB              (c) 1994 vit$oft
;*  This device will disable keyboard until an application
;*  sends a value of 0F4h to port 60h.
*;
;*  Compile:   TASM NUMB
;*             TLINK /t NUMB, NUMB.SYS
;**********************************************************

IDEAL
MODEL           TINY
INCLUDE         "DOS.MAC"
INCLUDE         "KBD.MAC"
SEGMENT         SYS
ASSUME          CS:SYS, DS:SYS, ES:SYS, SS:SYS
ORG             0
DeviceChain     DD -1
DeviceAttr      DW 8000h
DeviceStrategy  DW OFFSET Strategy
DeviceInterrupt DW OFFSET Interrupt
DeviceName      DB 'NUMB    '
Queue           DD 00000H
Title$          DB $CR,$LF,'Keyboard is NUMB until an application
locks.'
                DB '    (c) 1994 vit$oft',0

PROC        Strategy FAR
            MOV [WORD LOW  CS:Queue],BX
            MOV [WORD HIGH CS:Queue],ES
            RETF
ENDP        Strategy

PROC        Interrupt FAR
            PUSH AX BX CX DX DS ES
             LDS BX,[CS:Queue]
             MOV [WORD BX+3],8102h ; status:done,not ready
             MOV [WORD BX+14],0  ; offset TSR
             MOV [WORD BX+16],CS ; segment TSR
             PUSH CS
             POP DS
             PUSH CS
             POP ES
             WriteLn ,Title$,
             MOV AL,0F5h ; disable keyboard
             OUT 60h,AL
            POP ES DS DX CX BX AX
            RETF
ENDP            Interrupt
ENDS            SYS
END


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