Utility routines: mvblockK

       Name: mvblockK                                                [Show more]
       Type: Subroutine
   Category: Utility routines
    Summary: Copy a specific number of pages in memory
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * wantdials calls mvblockK
             * wantdials calls via mvbllop


 Arguments:

   V(1 0)               Source address

   SC(1 0)              Destination address

   X                    Number of pages of memory to copy


 Other entry points:

   mvbllop              Only copy Y bytes, rather than a whole page


.mvblockK

 LDY #0                 ; Set an index counter in Y

.mvbllop

 LDA (V),Y              ; Copy the Y-th byte from V(1 0) to SC(1 0)
 STA (SC),Y

 DEY                    ; Decrement the index counter

 BNE mvbllop            ; Loop back until we have copied a whole page of bytes

 INC V+1                ; Increment the high bytes of V(1 0) and SC(1 0) to
 INC SC+1               ; point to the next page in memory

 DEX                    ; Decrement the page counter

 BNE mvbllop            ; Loop back until we have copied X pages of memory

 RTS                    ; Return from the subroutine