Differences

This shows you the differences between two versions of the page.

--- base:variable_speedcode_runlength [2016-04-16 11:42] – created bitbreaker
+++ base:variable_speedcode_runlength [2016-04-16 12:00] – bitbreaker
@@ Line 1: / Line 1: @@
+====== Variable speedcode runlength ======
 After you entered a segment of speed code at a certain spot by making use of some method discussed in the Article "[[Dispatch on a byte]]" we now want to exit that code at a certain spot.
@@ Line 6: / Line 6: @@
 <code>
+                        ;<- enter here
         sta $0400
         sta $0401
@@ Line 15: / Line 16: @@
         sta $0407
         sta $0408
+                        ;<- leave here
         sta $0409
         sta $040a
@@ Line 36: / Line 38: @@
           lda #$08
           sta $dd0e
+          lda #$00
+          sta $dd04
+          sta $dd05
           lda $dd0d
           lda #$81
@@ Line 49: / Line 54: @@
           sta $dd04
           ;this can even be ommitted if we do not run more than 255 cycles
-          lda runlength_hi,x
+          ;lda runlength_hi,x
-          sta $dd05
+          ;sta $dd05
+          tsx
           lda #$09
@@ Line 80: / Line 87: @@
           !byte $00,$00,$00,$00,$00 ...
 exit
-          tsx
-          txa
-          sbx #$03
           txs
           cli