mirror of https://github.com/cc65/cc65.git
160 lines
3.9 KiB
ArmAsm
160 lines
3.9 KiB
ArmAsm
;
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; Groepaz/Hitmen, 11.10.2015
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;
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; Low level init code for soft80 screen output/console input
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;
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.constructor soft80_init, 8
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.destructor soft80_shutdown
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.import soft80_kclrscr, soft80_charset
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.export soft80_internal_bgcolor, soft80_internal_cellcolor
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.export soft80_internal_cursorxlsb
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.importzp ptr1, ptr2, ptr3
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.include "c64.inc"
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.include "soft80.inc"
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soft80_init:
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lda soft80_first_init
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bne @skp
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jsr firstinit
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@skp:
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; the "color voodoo" in other parts of the code relies on the vram and
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; colorram being set up as expected, which is why we cant use the
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; _bgcolor and _textcolor functions here.
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lda CHARCOLOR ; use current textcolor
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and #$0F ; make sure the upper nibble is 0s
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sta CHARCOLOR
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lda VIC_BG_COLOR0 ; use current bgcolor
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and #$0F
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sta soft80_internal_bgcolor
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asl a
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asl a
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asl a
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asl a
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ora CHARCOLOR
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sta soft80_internal_cellcolor
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lda #$3B
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sta VIC_CTRL1
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lda #$00
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sta CIA2_PRA
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lda #$68
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sta VIC_VIDEO_ADR
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lda #$C8
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sta VIC_CTRL2
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jmp soft80_kclrscr
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soft80_shutdown:
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lda #$07
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sta CIA2_PRA
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jmp $FF5B ; Initialize video I/O
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.segment "ONCE"
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firstinit:
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; copy charset to RAM under I/O
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sei
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lda $01
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pha
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lda #$34
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sta $01
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inc soft80_first_init
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lda #<soft80_charset
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ldx #>soft80_charset
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sta ptr1
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stx ptr1+1
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lda #<soft80_lo_charset
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ldx #>soft80_lo_charset
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sta ptr2
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stx ptr2+1
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lda #<soft80_hi_charset
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ldx #>soft80_hi_charset
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sta ptr3
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stx ptr3+1
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ldx #4
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@l2:
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ldy #0
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@l1:
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lda (ptr1),y
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sta (ptr2),y
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asl a
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asl a
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asl a
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asl a
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sta (ptr3),y
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iny
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bne @l1
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inc ptr1+1
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inc ptr2+1
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inc ptr3+1
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dex
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bne @l2
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; copy the kplot tables to ram under I/O
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;ldx #0 ; is 0
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@l3:
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lda soft80_tables_data_start,x
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sta soft80_bitmapxlo,x
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lda soft80_tables_data_start + (soft80_tables_data_end - soft80_tables_data_start - $0100),x
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sta soft80_bitmapxlo + (soft80_tables_data_end - soft80_tables_data_start - $0100),x
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inx
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bne @l3
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pla
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sta $01
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cli
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rts
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; the following tables take up 267 bytes, used by kplot
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soft80_tables_data_start:
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soft80_bitmapxlo_data:
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.repeat 80,col
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.byte <((col/2)*8)
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.endrepeat
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soft80_bitmapxhi_data:
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.repeat 80,col
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.byte >((col/2)*8)
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.endrepeat
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soft80_vramlo_data:
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.repeat 25,row
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.byte <(soft80_vram+(row*40))
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.endrepeat
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.byte 0,0,0,0,0,0,0 ; padding to next page
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soft80_vramhi_data:
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.repeat 25,row
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.byte >(soft80_vram+(row*40))
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.endrepeat
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soft80_bitmapylo_data:
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.repeat 25,row
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.byte <(soft80_bitmap+(row*40*8))
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.endrepeat
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soft80_bitmapyhi_data:
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.repeat 25,row
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.byte >(soft80_bitmap+(row*40*8))
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.endrepeat
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soft80_tables_data_end:
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;-------------------------------------------------------------------------------
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.segment "INIT"
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soft80_internal_cellcolor:
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.res 1
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soft80_internal_bgcolor:
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.res 1
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soft80_internal_cursorxlsb:
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.res 1
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.data
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soft80_first_init:
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.byte 0 ; flag to check first init, this really must be in .data
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