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43 lines
1.2 KiB
ArmAsm
43 lines
1.2 KiB
ArmAsm
;
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; jede jede@oric.org 2017-10-01
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;
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.export _cgetc
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.import cursor
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.export store_char
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.include "telestrat.inc"
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.proc _cgetc
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; This routine could be quicker if we wrote in page 2 variables,
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; But it's better to use telemon routine in that case, because telemon can manage 4 I/O
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ldx cursor ; If cursor equal to 0, then switch off cursor
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beq switchoff_cursor
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ldx #$00 ; x is the first screen
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BRK_TELEMON(XCSSCR) ; Display cursor
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jmp start ; Could be replaced by a bne/beq but 'jmp' is cleaner than a bne/beq which could expect some matters
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switchoff_cursor:
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; At this step X is equal to $00, X must be set, because it's the id of the screen (telestrat can handle 4 virtuals screen)
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BRK_TELEMON(XCOSCR) ; Switch off cursor
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start:
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lda store_char ; Does kbhit store a value in store_char ?
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bne @out ; Yes, we returns A and we reset store_char
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@wait_key:
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BRK_TELEMON XRD0 ; Waits until key is pressed
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bcs @wait_key
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ldx #$00
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rts
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@out:
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ldx #$00
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stx store_char
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rts
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.endproc
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.bss
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store_char:
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.byte 0
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