jmechner April 17, 2012
Attempted line ending fix

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     lst off
     org $c00
    *-------------------------------------------------
     dum 0curpage ds 1xsave ds 1ysave ds 1asave ds 1temp ds 1tmplo ds 1tmphi ds 1level ds 1isGS? ds 1 dend
    framebase = $1000
    *------------------------------------------------- show** put on the show!*
    show bit $C010
     lda #0 sta isGS?
     bit $C081 sec jsr $fe1f ;GS? bcs :notGS
     inc isGS?
    * Use special show frame routine for //GS that* writes directly to bank $E0, since page two* text is not properly shadowed to that bank.
     ldx #$4C ;jmp ldy #GSshowframe lda #>GSshowframe stx showframe sty showframe+1 sta showframe+2
    * Make our lookup tables up in ramcard area
    :notGS bit $C083 bit $C083
     jsr MAKEfade_tbls
     jsr lgr
    :again
     ldx #0:fadein stx level lda #0 jsr showframe ldx level inx cpx #15 bcc :fadein
    * Here we go...
     lda #0:floop pha ldx #15 jsr showframe pla clc adc #1 cmp #23 bcc :floop
     ldx #15:fadeout stx level lda #22 jsr showframe ldx level dex bpl :fadeout
     bit $C000 bpl *-3 bit $C010
     jmp :again
    *------------------------------------------------- lgr** Clear and display lo-resolution screen*
    lgr sta $C000 ;turn off 55.54 select sta $C00C ;40 columns bit $C052 ;full screen bit $C055 ;show page two bit $C056 ;lores bit $C050 ;graphics on
     lda #4 ;use page one next sta curpage
     ldy #0 sty tmplo sta tmphi
     tya ldx #8
    :0 sta (tmplo),y iny bne :0
     inc tmphi dex bne :0
     rts
    *------------------------------------------------- loget** Enter with a:frame number*            x:fade level*
    showframe asl asl adc #>framebase sta :src+2 ;hi byte
     txa ora #>fade_table sta :fademod+2
     lda curpage sta :dst+2 eor #4!8 sta curpage
     lda #4 sta temp
     ldx #0:loop:src ldy $1100,x:fademod lda fade_table+$F00,y:dst sta $0400,x inx bne :loop
     inc :src+2 ;hibyte inc :dst+2 ; "  "
     dec temp bne :loop
    ]waitvbl jsr waitvbl
     bit $C055 lda curpage cmp #4 beq *+5 bit $C054
     rts
    GSshowframe asl asl adc #>framebase sta :src+2 ;hi byte
     txa ora #>fade_table sta :fademod+2
     lda curpage sta :dst+2 eor #4!8 sta curpage
     lda #4 sta temp
     ldx #0:loop:src ldy $1100,x:fademod lda fade_table+$F00,y:dst stal $E00400,x inx bne :loop
     inc :src+2 ;hibyte inc :dst+2 ; "  "
     dec temp bne :loop beq ]waitvbl
    *------------------------------------------------- waitvbl** Wait for a few vbl's to go by!*
    waitvbl ldx #6:0 bit $C019 bpl :0:1 bit $C019 bmi :1 dex bne :0 rts
    *------------------------------------------------- MAKEfade_tbls** Make 16 lookup tables each containing 256 bytes* for the 16 levels of fade-in.*
    MAKEfade_tbls dum 0:curtmp ds 2 ;ptr into current tmp_scale table:curfade ds 2 ;ptr into current page of fade table:temp ds 1:ysave ds 1 dend
     jsr MAKEtmp_scale
     ldy #tmp_scale lda #>tmp_scale sty :curtmp sta :curtmp+1
     ldy #fade_table lda #>fade_table sty :curfade sta :curfade+1
    * byte loop
     ldy #0
    :bloop tya and #$0F jsr :convert sta :temp
     tya lsr lsr lsr lsr jsr :convert asl asl asl asl ora :temp
     sta (:curfade),y
     iny bne :bloop
    * next fade table
     inc :curfade+1
    * next tmp table
     clc lda :curtmp adc #16 sta :curtmp bcc :bloop
     rts
    * given a=0-15, in lores unsequential grey scale,* convert it back to sequential, lookup new value* in tmp_scale table and then convert back to* lores unsequential.
    :convert sty :ysave
    * Convert lores color back to sequential 00-0F
     tax lda :unlores,x
    * Scale it
     tay lda (:curtmp),y
    * Convert back to unsequential lores color
     tax lda isGS? beq :notGS lda :loresGS,x bra :isGS
    :notGS lda :lores2e,x
    :isGS ldy :ysave rts
    :unlores hex 000301070405020a hex 06080b0c090e0d0f
    :loresGS hex 0002060104050803 hex 090c070a0b0e0d0f
    :lores2e hex 00000000 hex 02020202 hex 06060606 hex 07070707
    *------------------------------------------------- MAKEtmp_scale** Make lookup table that contains values* for 0-15 multiplied by 1/16...  16/16.*
    MAKEtmp_scale dum 0:color ds 1:scale ds 1 dend
     lda #1 ;start with 1/16th sta :scale
    :sloop ldy #0:cloop sty :color lda #0 ldx :scale:mloop clc adc :color dex bne :mloop lsr lsr lsr lsr:smc sta tmp_scale,y iny cpy #16 bne :cloop inc :scale lda :smc+1 clc adc #16 sta :smc+1 bcc :sloop rts
    *-------------------------------------------------
     dum $D000fade_table ds $1000tmp_scale ds $100 dend
    *------------------------------------------------- EOF

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