cbm stuff from greggs pull request

2017-12-11 19:49:14 +01:00
parent 947b09ad96
commit 8902730756
21 changed files with 936 additions and 7 deletions
--- a/libsrc/c128/cpeekcolor.s
+++ b/libsrc/c128/cpeekcolor.s
@@ -0,0 +1,56 @@
+;
+; 2016-02-28, Groepaz
+; 2017-06-26, Greg King
+;
+; unsigned char cpeekcolor (void);
+;
+
+        .export         _cpeekcolor
+
+        .include        "c128.inc"
+
+
+_cpeekcolor:
+        bit     MODE
+        bmi     @c80
+
+        ldy     CURS_X
+        lda     (CRAM_PTR),y    ; get color
+        and     #$0F
+        ldx     #>$0000
+        rts
+
+@c80:   lda     CRAM_PTR
+        ldy     CRAM_PTR+1
+        clc
+        adc     CURS_X
+        bcc     @s
+        iny
+
+        ; get byte from VDC mem
+@s:     ldx     #VDC_DATA_LO
+        stx     VDC_INDEX
+@L0:    bit     VDC_INDEX
+        bpl     @L0
+        sta     VDC_DATA
+        dex
+        stx     VDC_INDEX
+        sty     VDC_DATA
+
+        ldx     #VDC_RAM_RW
+        stx     VDC_INDEX
+@L1:    bit     VDC_INDEX
+        bpl     @L1             ; wait for blanking
+        lda     VDC_DATA
+        and     #$0F
+
+; translate VDC->VIC colour
+
+vdctovic:
+        ldy     #$0F + 1
+@L2:    dey
+        cmp     $CE5C,y
+        bne     @L2
+        tya
+        ldx     #>$0000
+        rts