maintain lsb of cursor x position internally, saves some bytes and some cycles too :)

2015-10-12 15:44:41 +02:00
parent 2a0f6c420b
commit 21732e3c5b
5 changed files with 39 additions and 25 deletions
--- a/libsrc/c64/soft80_kplot.s
+++ b/libsrc/c64/soft80_kplot.s
@@ -6,6 +6,7 @@
 ;

        .export         soft80_kplot
+        .import         soft80_internal_cursorxlsb

        .include        "c64.inc"
        .include        "soft80.inc"
@@ -25,6 +26,10 @@ soft80_kplot:
        adc     _bitmapxhi,y
        sta     SCREEN_PTR+1

+        tya
+        and     #1
+        sta     soft80_internal_cursorxlsb
+
        ; calc pointer to vram
        tya
        lsr     a               ; NOTE: we can save 2 cycles here at the expense of