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Look for NULL pointer more efficiently.
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parent
a555b5f6a5
commit
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libsrc
@ -1,7 +1,7 @@
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;
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; Driver for the Inkwell Systems 170-C and 184-C lightpens.
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;
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; 2013-06-17, Greg King
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; 2013-07-01, Greg King
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;
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.include "zeropage.inc"
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@ -148,14 +148,13 @@ INSTALL:
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ldx LIBREF+1
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sta ptr1 ; Point to mouse_adjuster
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stx ptr1+1
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ldy #0
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ldy #1
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lda (ptr1),y
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sta Calibrate+1 ; Point to function
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iny
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bze @L1 ; Don't call pointer if it's NULL
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sta Calibrate+2 ; Point to function
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dey
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lda (ptr1),y
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sta Calibrate+2
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ora Calibrate+1 ; Don't call pointer if it's NULL
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bze @L1
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sta Calibrate+1
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lda #<XOffset ; Function will set this variable
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ldx #>XOffset
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jsr Calibrate
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@ -164,7 +163,8 @@ INSTALL:
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; It needs to be done here because the lightpen interrupt handler doesn't
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; set the lightpen position if it hasn't changed.
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@L1: jsr CHIDE
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@L1: sei
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jsr CHIDE
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lda #<(SCREEN_HEIGHT / 2)
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ldx #>(SCREEN_HEIGHT / 2)
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@ -172,6 +172,7 @@ INSTALL:
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lda #<(SCREEN_WIDTH / 2)
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ldx #>(SCREEN_WIDTH / 2)
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jsr MoveX
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cli
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; Done, return zero.
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@ -1,7 +1,7 @@
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;
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; Driver for the Inkwell Systems 170-C and 184-C lightpens.
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;
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; 2013-06-17, Greg King
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; 2013-07-01, Greg King
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;
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.include "zeropage.inc"
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@ -133,14 +133,13 @@ INSTALL:
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ldx LIBREF+1
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sta ptr1 ; Point to mouse_adjuster
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stx ptr1+1
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ldy #0
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ldy #1
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lda (ptr1),y
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sta Calibrate+1 ; Point to function
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iny
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bze @L1 ; Don't call pointer if it's NULL
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sta Calibrate+2 ; Point to function
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dey
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lda (ptr1),y
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sta Calibrate+2
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ora Calibrate+1 ; Don't call pointer if it's NULL
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bze @L1
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sta Calibrate+1
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lda #<XOffset ; Function will set this variable
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ldx #>XOffset
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jsr Calibrate
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@ -149,7 +148,8 @@ INSTALL:
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; It needs to be done here because the lightpen interrupt handler doesn't
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; set the lightpen position if it hasn't changed.
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@L1: jsr CHIDE
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@L1: sei
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jsr CHIDE
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lda #<(SCREEN_HEIGHT / 2)
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ldx #>(SCREEN_HEIGHT / 2)
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@ -157,6 +157,7 @@ INSTALL:
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lda #<(SCREEN_WIDTH / 2)
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ldx #>(SCREEN_WIDTH / 2)
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jsr MoveX
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cli
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; Done, return zero.
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