'===========================================================================
' Subject: KEYBOARD HANDLER FOR PB           Date: 03-30-99 (13:12)       
' Author:  Tim Nordell                       Code: PB                     
' Origin:  tim@techmaster.roseville.k12.mn Packet: KEYBOARD.ABC
'===========================================================================
  DECLARE FUNCTION SetOnExit%(BYVAL ProcedurePointer???)

shared sf??,foff??
dim ckeys(128,1) as shared byte
sub enablekey() public
	dim h as byte ptr
   h=codeptr32(skppp)+1
   @h=1
end sub
sub disablekey() public
	dim h as byte ptr
   h=codeptr32(skppp)+1
   @h=0
end sub
sub enable() public
	dim h as integer ptr
	dim g as dword ptr
	h=codeptr32(locat)+1
	@h=varseg(ckeys(0,0))
	h=h+3
	@h=varptr(ckeys(0,0))
	g=codeptr32(hjkl)+1
	getinterruptvector 9,sf??,foff??
	@g=sf??*&h10000+foff??
	setinterruptvector 9,codeseg(keyhand),codeptr(keyhand)
	a???=codeptr32(disable)
	call setonexit(a???)
end sub

sub disable() public
	setinterruptvector 9,sf??,foff??
end sub

sub kyhand()
	print "Not to be called directly..."
	exit sub
	keyhand:
		!	push ax
		!	push bx
		!	push ds
		!	push si
		!	push cx
		!	push dx
		locat:
			!	mov ax,&hffef
			!	Mov bx,&hfeff
			!	push ax
			!	pop ds
			!	push bx
			!	pop si
			!	xor ax,ax
			!	mov al,ds:[si]
			!	cmp al,1
			!	jne notex
				!	add bx,129
				!	mov ax,0
				!	mov ds:[si],al
				!	push bx
				!	pop si
			notex:
			!	mov ah,0
			!	in al,&h60
			!	cmp al,&he0
			!	je exttt
			!	cmp ax,127
			!	jle of
			!	mov ds:[Si],al
			!	sub al,128
			!	add bx,ax
			!	push bx
			!	pop si
			!	xor al,al
			!	mov ds:[Si],al
			!	jmp skppp
		of:
			!	mov ds:[Si],al
			!	add bx,ax
			!	push bx
			!	pop si
			!	mov al,1
			!	mov ds:[Si],al
		skppp:
         !  mov al,&h01
			!  cmp al,0
         !  je  hjkll
			!	pop dx
			!	pop cx
			!	pop si
			!	pop ds
			!	pop bx
			!	pop ax
		hjkl:
			$inline &HeA,&Hff,&hff,&hff,&hff
			!	iret
		exttt:
			!	mov al,1
			!	mov ds:[si],al
			!	jmp skppp
		hjkll:
         !  mov  al,&h20
         !  out  &h20,al
			!	pop dx
			!	pop cx
			!	pop si
			!	pop ds
			!	pop bx
			!	pop ax
			!	iret
end sub




 SUB SetInterruptVector(Intr%,Segment??,Offset??)
	!	cli
 REG 1,&H2500 + Intr%
 REG 4,Offset??
 REG 8,Segment??
 CALL INTERRUPT &H21
 	!	sti
 END SUB

 SUB GetInterruptVector(Intr%,S??,O??)
 	!	cli
 REG 1,&H3500 + Intr%
 CALL INTERRUPT &H21
 S??=REG(9)
 O??=REG(2)
 	!	sti
 END SUB
enable
disablekey
do
if ckeys(1,0) then disable:stop
for i%=1 to 128
  if ckeys(i%,0) then print "   ";hex$(i%);
  if ckeys(i%,1) then print "   E";hex$(i%);
next i%
print
loop