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added FASTSCAN
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Charles Mangin
GitHub
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BIN
FASTSCAN.dsk
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BIN
FASTSCAN.dsk
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209
fastscan.s
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209
fastscan.s
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DSK FASTSCAN
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**************************************************
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* To Do:
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*
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**************************************************
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* Variables
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**************************************************
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CHAR EQU $FC ; char/pixel to plot
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DELAY EQU $03
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DIRECTION EQU $02
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**************************************************
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* Apple Standard Memory Locations
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**************************************************
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CLRLORES EQU $F832
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LORES EQU $C050
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TXTSET EQU $C051
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MIXCLR EQU $C052
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MIXSET EQU $C053
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TXTPAGE1 EQU $C054
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TXTPAGE2 EQU $C055
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KEY EQU $C000
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C80STOREOFF EQU $C000
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C80STOREON EQU $C001
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STROBE EQU $C010
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SPEAKER EQU $C030
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VBL EQU $C02E
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RDVBLBAR EQU $C019 ;not VBL (VBL signal low
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WAIT EQU $FCA8
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RAMWRTAUX EQU $C005
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RAMWRTMAIN EQU $C004
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SETAN3 EQU $C05E ;Set annunciator-3 output to 0
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SET80VID EQU $C00D ;enable 80-column display mode (WR-only)
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HOME EQU $FC58 ; clear the text screen
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CH EQU $24 ; cursor Horiz
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CV EQU $25 ; cursor Vert
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VTAB EQU $FC22 ; Sets the cursor vertical position (from CV)
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COUT EQU $FDED ; Calls the output routine whose address is stored in CSW,
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; normally COUTI
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STROUT EQU $DB3A ;Y=String ptr high, A=String ptr low
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ALTTEXT EQU $C055
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ALTTEXTOFF EQU $C054
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ROMINIT EQU $FB2F
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ROMSETKBD EQU $FE89
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ROMSETVID EQU $FE93
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ALTCHAR EQU $C00F ; enables alternative character set - mousetext
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BLINK EQU $F3
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SPEED EQU $F1
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**************************************************
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* START - sets up various fiddly zero page bits
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**************************************************
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ORG $2000 ; PROGRAM DATA STARTS AT $2000
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DRAWBOARD JSR HOME
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JSR MESSAGE ; 8677 cycles.
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LDA #$11
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STA CHAR
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STA DIRECTION
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STA DELAY
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LDA #$01
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STA SPEED
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JSR FILLSCREENFAST ; 6023 cycles.
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* read the VBL
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READVBL BIT RDVBLBAR ; 4
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* if bit7 = 0, then VBL active
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BMI READVBL ; 2 wait until refresh interval
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* set TEXT during VBL
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STA TXTSET ; 4
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STA TXTPAGE1
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* read the VBL again
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READVBL2 BIT RDVBLBAR ; 4
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* if bit7 = 1, then VBL active
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BPL READVBL2 ; 2 loop while VBL is happening
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* VBL is over
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* do something while the screen draws a bit
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* Screen draws in 12480 instructions
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LDA DIRECTION ; incrementing or decrementing?
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ROR ; bit 0 into Carry
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BCC INCREMENT ; even = increment, odd = decrement
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DECREMENT DEC DELAY ; scan line going up
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STA TXTPAGE1 ; show page 1 ( message )
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JMP XLOOP ; wait
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INCREMENT INC DELAY ; scan line going down
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XLOOP LDX DELAY
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BEQ NOLOOP
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CPX #$FF
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BEQ NOLOOP
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XLOOP2 NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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NOP ; 2
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DEX ; 2
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BNE XLOOP2 ; 2
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* set GR at bottom of screen
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NOLOOP STA LORES ; 4
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STA TXTPAGE2
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LDA DELAY
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CMP #$C0
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BCS GOFILL ; == C0 change directions
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* loop until the next blank
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GOLOOP JMP READVBL
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GOFILL INC DIRECTION ; equal or greater than c0, change colors
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LDA CHAR
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CLC
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ADC #$11
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STA CHAR
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JSR FILLSCREENFAST ; change colors when loop length is >C0
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JMP READVBL
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**************************************************
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* writes message
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**************************************************
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HELLOWORLD ASC "Check out what I learned at Kansasfest!",00 ; set to ascii for message
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MESSAGE
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LDA #$0B
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STA CV ; jump down
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JSR VTAB
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LDA #$00
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STA CH
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LDY #>HELLOWORLD
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LDA #<HELLOWORLD
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JSR STROUT ;Y=String ptr high, A=String ptr low
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RTS
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;/MESSAGE
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**************************************************
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* blanks the screen quickly.
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* https://www.atarimagazines.com/compute/issue10/032_1_THE_APPLE_GAZETTE.php
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**************************************************
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; FOR EACH ROW/COLUMN
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FILLSCREENFAST ; 6023 instructions
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FLASH LDA CHAR ; Get selected color byte
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LDY #$78 ; Prepare to fill 120 bytes
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JSR FILL1 ; Fill four sets of 120 bytes each
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LDY #$78 ; Prepare to fill 80 bytes
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JSR FILL2 ; Fill four sets of 80 bytes each
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RTS ; Done. Return.
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FILL1 DEY
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STA $800, Y
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STA $880, Y
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STA $900, Y
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STA $980, Y
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BNE FILL1
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RTS
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FILL2 DEY
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STA $a00, Y
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STA $a80, Y
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STA $b00, Y
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STA $b80, Y
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BNE FILL2
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RTS
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