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⌂ ∞ ▽ Elite on the 6502

Save and load: TRNME

[Commodore 64 version]

       Name: TRNME                                                   [Show more]
       Type: Subroutine
   Category: Save and load
    Summary: Copy the last saved commander's name from INWK to NA%

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * SVE calls TRNME




.TRNME

 LDX #7                 ; The commander's name can contain a maximum of 7
                        ; characters, and is terminated by a carriage return,
                        ; so set up a counter in X to copy 8 characters

 LDA thislong           ; Copy the length of the commander's name from thislong
 STA oldlong            ; to oldlong (though this is never used, so this
                        ; doesn't have any effect)

.GTL1

 LDA INWK+5,X           ; Copy the X-th byte of INWK+5 to the X-th byte of NA%
 STA NA%,X

 DEX                    ; Decrement the loop counter

 BPL GTL1               ; Loop back until we have copied all 8 bytes

                        ; Fall through into TR1 to copy the name back from NA%
                        ; to INWK. This isn't necessary as the name is already
                        ; there, but it does save one byte, as we don't need an
                        ; RTS here