initial commit of soft80 implementation

2015-09-27 18:12:25 +02:00
parent 067956b808
commit 9e08c53b01
13 changed files with 1351 additions and 0 deletions
--- a/libsrc/c64/soft80_conio.s
+++ b/libsrc/c64/soft80_conio.s
@@ -0,0 +1,74 @@
+;
+; Low level stuff for screen output/console input
+;
+
+        .constructor    soft80_init, 24
+        .destructor     soft80_shutdown
+
+        .import         soft80_kclrscr, soft80_plotinit
+        .import         __textcolor, __bgcolor  ; CHECK/FIX
+
+        .include        "c64.inc"
+        .include        "soft80.inc"
+
+soft80_init:
+        lda     #$3b
+        sta     VIC_CTRL1
+        lda     #$00
+        sta     CIA2_PRA
+        lda     #$68
+        sta     VIC_VIDEO_ADR
+        lda     #$c8
+        sta     VIC_CTRL2
+
+; copy charset to RAM under I/O -> FIXME: generate at runtime
+        sei
+        lda     $01
+        pha
+        lda     #$34
+        sta     $01
+
+        lda     #>soft80_lo_charset0
+        sta     @hi1+2
+        lda     #>$d000
+        sta     @hi2+2
+
+        ldy     #8
+@l2:
+        ldx     #0
+@l1:
+@hi1:   lda     soft80_lo_charset0,x
+@hi2:   sta     $d000,x
+        inx
+        bne     @l1
+        inc     @hi1+2
+        inc     @hi2+2
+        dey
+        bne     @l2
+
+        pla
+        sta     $01
+        cli
+
+        jsr     soft80_plotinit
+
+        lda     #1
+        sta     __textcolor
+        lda     #0
+        sta     __bgcolor
+
+        jmp     soft80_kclrscr
+
+soft80_shutdown:
+        lda     #$1b
+        sta     VIC_CTRL1
+        lda     #$03
+        sta     CIA2_PRA
+        lda     #$15
+        sta     VIC_VIDEO_ADR
+        rts
+
+; FIXME: generate the charset at init time, and put it into RAM under I/O
+
+        .include "soft80_charset.s"
+