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68 lines
1.6 KiB
ArmAsm
68 lines
1.6 KiB
ArmAsm
;
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; Groepaz/Hitmen, 19.10.2015
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;
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; high level implementation for the monochrome soft80 implementation
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;
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; char cgetc (void);
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;
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.export soft80mono_cgetc
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.import soft80mono_internal_cellcolor, soft80mono_internal_cursorxlsb
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.import soft80mono_internal_nibble
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.import cursor
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.importzp tmp1
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.include "cbm_kernal.inc"
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.include "c64.inc"
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.include "soft80.inc"
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soft80mono_cgetc:
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lda KEY_COUNT ; Get number of characters
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bne @L3 ; Jump if there are already chars waiting
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jsr invertcursor ; set cursor on or off accordingly
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@L1: lda KEY_COUNT ; wait for key
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beq @L1
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jsr invertcursor ; set cursor on or off accordingly
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@L3: jsr KBDREAD ; Read char and return in A
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ldx #0
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rts
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; Switch the cursor on or off (invert)
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invertcursor:
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lda cursor
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bne @invert
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rts
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@invert:
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sei
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lda $01 ; enable RAM under I/O
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pha
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lda #$34
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sta $01
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ldy #$00
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ldx soft80mono_internal_cursorxlsb
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@lp1:
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lda (SCREEN_PTR),y
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eor soft80mono_internal_nibble,x
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sta (SCREEN_PTR),y
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iny
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cpy #8
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bne @lp1
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pla
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sta $01 ; enable I/O
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cli
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rts
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;-------------------------------------------------------------------------------
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; force the init constructor to be imported
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.import soft80mono_init
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conio_init = soft80mono_init
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