Fixed and improved some pce comments.

2015-11-17 09:14:15 -05:00
parent 2cc822b44e
commit 959eff34a3
15 changed files with 61 additions and 55 deletions
--- a/libsrc/pce/clrscr.s
+++ b/libsrc/pce/clrscr.s
@@ -1,3 +1,9 @@
+;
+; Clear (erase) the screen.
+;
+; Support the full 128- x 64-tile background.
+;
+
        .export         _clrscr

        .import         plot
@@ -15,9 +21,9 @@ _clrscr:
 rowloop:
        ldx     #$80
 colloop:
-        lda     #' '
+        lda     #' '            ; low byte of char. index
        sta     VDC_DATA_LO
-        lda     #$02
+        lda     #$02            ; background color, high nybble of char. index
        sta     VDC_DATA_HI

        dex