Smarter bittable generation (thanks @jhusak)

2026-05-20 22:34:21 +02:00 · 2023-06-21 14:06:26 +02:00
parent 189d3ed593
commit 7eef3851e7
6 changed files with 16 additions and 14 deletions
@@ -659,16 +659,17 @@ next8lines
      iny
      cpy #screenheight+1
    bne @-
-    ; and bittables for fastes plot and point
+    ; and bittables for fastest plot and point (thanks @jhusak)
    ldy #0
-@   tya
-    and #%00000111
-    tax
-    lda bittable,x
+    lda #$40
+@   asl
+    adc #0
    sta bittable1_long,y
+    tax
    eor #%11111111
    sta bittable2_long,y
-    iny
+    txa
+    dey
    bne @-
    rts
 .endp