Sound: BDRO15

       Name: BDRO15                                                  [Show more]
       Type: Subroutine
   Category: Sound
    Summary: Process music command <#15> to rest for 2 * value4 interrupts
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * BDJMPTBH calls BDRO15
             * BDJMPTBL calls BDRO15


.BDRO15

 LDA BDBUFF             ; Slide the value %1000 (8) into the low nibble of
 SEC                    ; BDBUFF while shifting the original low nibble into
 ROL A                  ; the high nibble
 ASL A                  ;
 ASL A                  ; Because we process the low nibble first in each music
 ASL A                  ; data byte, this inserts command <#8> into the queue as
 STA BDBUFF             ; the next command to be processed, after we fall
                        ; through into BDRO8 to process another command <#8>
                        ; first
                        ;
                        ; In other words, this processes two command <#8>s in a
                        ; row, which implements a double-length rest

                        ; Fall into BDRO8 to rest for value4 interrupts