75 lines
1.1 KiB
ArmAsm
75 lines
1.1 KiB
ArmAsm
;;;
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;;;
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;;; getkey.S
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;;;
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;;; PC-6001 architecture-depend key fetch module
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;;;
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;;; @author Takahide Matsutsuka <markn@markn.org>
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;;;
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.globl _keyavail_arch
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.globl _getkey_arch
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.area _GSINIT
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.area _DATA
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;; unsigned char key;
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_key:
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.ds 1
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.area _GSINIT
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.area _CODE
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;; ---------------------------------
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;; unsigned char keyavail_arch();
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;; AFBC__HL____
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;; a=getkey, l=getkey
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;; ---------------------------------
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_keyavail_arch:
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ld hl, #_key
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ld a, (hl)
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;; if (key != 0) return 1; else goto _getch;
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or a
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jr z, _getch
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ld l, #0x01
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ret
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_getch:
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push hl
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;; A = (keybuf)
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call #0x103a
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pop hl
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;; if (keybuf != null) goto _getch_key
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jr nz, _getch_key
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;; we do not have a keyin
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xor a
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jr _getch_got
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_getch_key:
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cp a, #0x14
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jr z, _getch
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_getch_got:
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;; key = getch()
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ld (hl), a
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ld l, a
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ret
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;; ---------------------------------
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;; unsigned char getkey_arch();
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;; AFBC__HL____
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;; ---------------------------------
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_getkey_arch:
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;; if (key == 0) keyavail_arch();
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ld hl, #_key
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ld a, (hl)
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or a
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call z, _keyavail_arch
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;; if (key == 0) goto _havekey
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or a
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jr z, _havekey
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;; key = 0
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ld (hl), #0x00
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_havekey:
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ld l, a
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ret
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