djb@wjh12.harvard.edu (David J. Birnbaum) (10/30/89)
My Hercules Graphics Card Plus requires a special screen
blanking utility, which Hercules thoughtfully supplies. Un-
fortunately, this routine blanks the screen after five minutes
of no keyboard activity. It does not check for mouse activity
and the screen frequently goes blank in the middle of mouse-
based applications. I can restore it by touching alt or ctrl
or shift, but I'd prefer not to.
Hercules sent me the assembler source code for the screen
blanker and I would like to modify it to check for mouse
activity. If anyone out there has a mouse manual, could you
please send me email explaining how to do this? I understand
that the mouse is called with 33h, but I have no idea what
goes in which register.
Thanks for any suggestions. I'll post a summary in a couple
of weeks.
--David
============================================================
David J. Birnbaum djb@wjh12.harvard.edu [Internet]
djb@harvunxw.bitnet [Bitnet]
============================================================news@udenva.cair.du.edu (netnews) (11/30/89)
In article <423@wjh12.harvard.edu> djb@wjh12.UUCP (David J. Birnbaum) writes: >blanker and I would like to modify it to check for mouse >activity. If anyone out there has a mouse manual, could you >please send me email explaining how to do this? I understand >that the mouse is called with 33h, but I have no idea what >goes in which register. Here is some code that I use to monitor an IBM PS/2 mouse. The documentation for this mouse states that the device driver for the PS/2 mouse allows the mouse to be used by applications that use the interface designed by Microsoft. So this code might work for you with some minor adaptation, of course. Just issue an Int 33h when it's time to blank the screen, and if the X or Y or one of the button statuses has changed, treat it like a keystroke, i.e. don't blank the screen. ;------------------------------------------------------------------------+ ; | ; G L O B A L V A R I A B L E S | ; | ;------------------------------------------------------------------------+ DATASEG segment word public 'data' public ps2_x_ ;X coordinate of IBM PS/2 mouse public ps2_y_ ;Y coordinate of IBM PS/2 mouse ps2_x_ dw 0 ;Start at 0,0 ps2_y_ dw 0 ;Start at 0,0 DATA ends ;------------------------------------------------------------------------+ ; Code Segment | ;------------------------------------------------------------------------+ CODESEG segment word public 'code' assume cs:CODESEG,ds:DATASEG,ss:DATASEG,es:DATASEG ;------------------------------------------------------------------------+ ; ps2_mouse() - Get data from an IBM PS/2 mouse. | ; | ; Returns button status in AX. | ; Bit 0 Left button (1 = down, 0 = up) | ; Bit 1 Right button (1 = down, 0 = up) | ;------------------------------------------------------------------------+ public ps2_mouse_ ps2_mouse_ proc near mov ax,03 ;3 = Get Position and Button Status int 33h ;Mouse driver interrupt mov ax,bx ;AX = BX = button status mov ds:ps2_x_,cx ;Store X position mov ds:ps2_y_,dx ;Store Y position ret ps2_mouse_ endp ;------------------------------------------------------------------------; ;------------------------------------------------------------------------; CODESEG ends end