Optimized mul20 & mul40 and extracted to new library.

2019-03-21 15:59:45 +01:00
parent fbf302e6cd
commit 399250a105
14 changed files with 216 additions and 92 deletions
--- a/libsrc/atari5200/cputc.s
+++ b/libsrc/atari5200/cputc.s
@@ -10,7 +10,7 @@

        .export         _cputcxy, _cputc
        .export         plot, cputdirect, putchar
-        .import         gotoxy, mul20
+        .import         gotoxy, _mul20
        .importzp       ptr4
        .import         setcursor

@@ -75,8 +75,7 @@ putchar:
        pha                     ; save char

        lda     ROWCRS_5200
-        jsr     mul20           ; destroys tmp4
-        clc
+        jsr     _mul20          ; destroys tmp4, carry is cleared
        adc     SAVMSC          ; add start of screen memory
        sta     ptr4
        txa