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60 lines
1.3 KiB
ArmAsm
60 lines
1.3 KiB
ArmAsm
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; Ullrich von Bassewitz, 22.11.2002
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; SETNAM replacement function
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;
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.export SETNAM
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.include "plus4.inc"
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; This function is special in that the name must reside in low memory,
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; otherwise it is not accessible by the ROM code.
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.segment "LOWCODE" ; Must go into low memory
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.proc SETNAM
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; Store the length of the name into the zero page
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sta FNAM_LEN
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; Check if we have to copy the name to low memory
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cmp #$00 ; Length zero?
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beq @L3 ; Yes: Copying not needed
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cpy #$00 ; Is the name in low memory?
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bpl @L3 ; Yes: Copying not needed
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; Store the length and the pointer to the name
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stx TMPPTR
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sty TMPPTR+1 ; Store pointer to name in TMPPTR
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; Copy the given name into FNBUF.
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ldy #$00
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@L2: lda (TMPPTR),y
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sta FNBUF,y
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iny
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cpy FNAM_LEN
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bne @L2
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; Load the new parameters for the low memory buffer
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ldx #<FNBUF
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ldy #>FNBUF
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; Instead of banking in the ROM, store the values directly into the zeropage
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@L3: stx FNAM
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sty FNAM+1
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; Return to caller
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rts
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.endproc
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