mirror of
https://github.com/cc65/cc65.git
synced 2024-11-04 17:04:58 +00:00
60 lines
1.3 KiB
ArmAsm
60 lines
1.3 KiB
ArmAsm
;
|
|
; Ullrich von Bassewitz, 22.11.2002
|
|
;
|
|
; SETNAM replacement function
|
|
;
|
|
|
|
.export SETNAM
|
|
|
|
.include "plus4.inc"
|
|
|
|
; This function is special in that the name must reside in low memory,
|
|
; otherwise it is not accessible by the ROM code.
|
|
|
|
.segment "LOWCODE" ; Must go into low memory
|
|
|
|
.proc SETNAM
|
|
|
|
; Store the length of the name into the zero page
|
|
|
|
sta FNAM_LEN
|
|
|
|
; Check if we have to copy the name to low memory
|
|
|
|
cmp #$00 ; Length zero?
|
|
beq @L3 ; Yes: Copying not needed
|
|
cpy #$00 ; Is the name in low memory?
|
|
bpl @L3 ; Yes: Copying not needed
|
|
|
|
; Store the length and the pointer to the name
|
|
|
|
stx TMPPTR
|
|
sty TMPPTR+1 ; Store pointer to name in TMPPTR
|
|
|
|
; Copy the given name into FNBUF.
|
|
|
|
ldy #$00
|
|
@L2: lda (TMPPTR),y
|
|
sta FNBUF,y
|
|
iny
|
|
cpy FNAM_LEN
|
|
bne @L2
|
|
|
|
; Load the new parameters for the low memory buffer
|
|
|
|
ldx #<FNBUF
|
|
ldy #>FNBUF
|
|
|
|
; Instead of banking in the ROM, store the values directly into the zeropage
|
|
|
|
@L3: stx FNAM
|
|
sty FNAM+1
|
|
|
|
; Return to caller
|
|
|
|
rts
|
|
|
|
.endproc
|
|
|
|
|