mirror of
https://github.com/cc65/cc65.git
synced 2024-11-16 18:08:04 +00:00
51 lines
1.1 KiB
ArmAsm
51 lines
1.1 KiB
ArmAsm
;
|
|
; Ullrich von Bassewitz, 14.09.2001
|
|
;
|
|
|
|
.export _peekbsys, _peekwsys
|
|
.importzp ptr1
|
|
|
|
.include "cbm610.inc"
|
|
|
|
|
|
; ------------------------------------------------------------------------
|
|
; unsigned char __fastcall__ peekbsys (unsigned addr);
|
|
|
|
.proc _peekbsys
|
|
|
|
sta ptr1 ; Store argument pointer
|
|
stx ptr1+1
|
|
ldx IndReg
|
|
lda #$0F
|
|
sta IndReg
|
|
ldy #$00
|
|
lda (ptr1),y
|
|
stx IndReg
|
|
ldx #$00 ; Extend to word
|
|
rts
|
|
|
|
.endproc
|
|
|
|
; ------------------------------------------------------------------------
|
|
; unsigned __fastcall__ peekwsys (unsigned addr);
|
|
|
|
.proc _peekwsys
|
|
|
|
sta ptr1 ; Store argument pointer
|
|
stx ptr1+1
|
|
ldx IndReg
|
|
lda #$0F
|
|
sta IndReg
|
|
ldy #$00
|
|
lda (ptr1),y ; Get low byte
|
|
pha
|
|
iny
|
|
lda (ptr1),y ; Get high byte
|
|
stx IndReg
|
|
tax ; High byte -> X
|
|
pla ; Low byte -> A
|
|
rts
|
|
|
|
.endproc
|
|
|