vdl macro

2023-01-31 16:35:02 -05:00
parent f703316128
commit a64d01067d
1 changed files with 22 additions and 0 deletions
@@ -51,6 +51,28 @@
         STX $0201
         STA NMIEN
         .ENDM
 ;-------------------------------------
        .MACRO VDL
 ;   VDL #WORD
 ;   Changes Display List addres
 ; and sets width of the screen
 ;    vdl dl,$01 - narrow screen (32 bytes)
 ;    vdl dl,$02 - normal screen (40 bytes)
 ;    vdl dl,$03 - wide screen   (48 bytes)
 ;       (works only with system interrupts ON)
         .if %0=2
           lda dmactls
           and #$fc
           ora #%2
           sta dmactls
         .endif
         LDA # <%1
         STA DLPTRS
         LDA # >%1
         STA DLPTRS+1
         .ENDM
 ;-------------------------------------
      .MACRO halt
 ?stop