654 lines
26 KiB
ArmAsm
654 lines
26 KiB
ArmAsm
* AUXMEM.SHR.S
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* (c) Bobbi 2022 GPLv3
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*
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* Routines for drawing bitmapped text and graphics in SHR mode
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* on Apple IIGS (640x200 4 colour, or 320x200 16 colour.)
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*
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SCB320 EQU $00 ; SCB for 320 mode
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SCB640 EQU $80 ; SCB for 640 mode
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* Pixel masks for colours in 640 mode
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SHRCMASK640 DB %00000000
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DB %01010101
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DB %10101010
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DB %11111111
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* Pixel masks for colours in 320 mode
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SHRCMASK320 DB $00
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DB $11
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DB $22
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DB $33
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DB $44
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DB $55
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DB $66
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DB $77
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DB $88
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DB $99
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DB $AA
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DB $BB
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DB $CC
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DB $DD
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DB $EE
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DB $FF
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* Addresses of start of text rows in SHR
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* LS byte is always zero
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* Add $A0 to get to next row of pixels
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SHRTAB DB $20 ; Text row 0
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DB $25 ; Text row 1
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DB $2a ; Text row 2
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DB $2f ; Text row 3
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DB $34 ; Text row 4
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DB $39 ; Text row 5
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DB $3e ; Text row 6
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DB $43 ; Text row 7
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DB $48 ; Text row 8
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DB $4d ; Text row 9
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DB $52 ; Text row 10
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DB $57 ; Text row 11
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DB $5c ; Text row 12
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DB $61 ; Text row 13
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DB $66 ; Text row 14
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DB $6b ; Text row 15
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DB $70 ; Text row 16
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DB $75 ; Text row 17
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DB $7a ; Text row 18
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DB $7f ; Text row 19
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DB $84 ; Text row 20
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DB $89 ; Text row 21
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DB $8e ; Text row 22
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DB $93 ; Text row 23
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* Enable SHR mode
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SHRVDU22 LDA #$18 ; Inhibit SHR & aux HGR shadowing
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TSB SHADOW
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LDA #$80 ; Most significant bit
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TSB NEWVIDEO ; Enable SHR mode
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LDA VDUPIXELS ; Pixels per byte
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CMP #$02 ; 2 is 320-mode (MODE 1)
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BNE :MODE0
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LDA #SCB320 ; SCB for 320-mode
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STZ CLR80VID ; 40 column text mode
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BRA :S1
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:MODE0 LDA #SCB640 ; SCB for 640-mode
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STZ SET80VID ; 80 column text mode
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:S1 LDX #$00
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:L1 STAL $E19D00,X ; SCBs begin at $9D00 in $E1
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INX
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CPX #200 ; 200 lines so 200 SCBs
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BNE :L1
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JSR SHRDEFPAL ; Default palette
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>>> XF2MAIN,SHRXPLDFONT ; Explode font -> SHRFONTXPLD table
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SHRV22RET >>> ENTAUX
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JSR VDU12 ; Clear text and SHR screen
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RTS
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******************************************************************************
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* Data in bank $E1
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******************************************************************************
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* Used for long writes
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SHRCOLMASKL EQU $E1B000 ; Colour mask foreground (word)
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SHRBGMASKL EQU $E1B002 ; Colour mask background (word)
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* Used for reads via data bank reg
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SHRCOLMASK EQU $B000 ; Colour mask foreground (word)
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SHRBGMASK EQU $B002 ; Colour mask background (word)
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******************************************************************************
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SHRBGMASKA DW $0000 ; Keep a copy in aux mem too
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* Write character to SHR screen
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* On entry: A - character to write
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SHRPRCHAR LDX VDUPIXELS ; Pixels per byte
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CPX #$02 ; 2 is 320-mode (MODE 1)
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BNE :S1
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JMP SHRPRCH320
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:S1 JMP SHRPRCH640
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* Plot or unplot a cursor on SHR screen
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* On entry: A - character to plot,
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* CS show cursor / CC remove cursor
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* VS read cursor / VC write cursor
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* The read and write cursors have separate save-unders in :SAVEBYTES
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SHRCURSOR PHP ; Preserve flags
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PHA ; Preserve A
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LDA VDUSTATUS ; If VDU5 mode, bail
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AND #$20
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BNE SHRCURSBAIL
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JSR SHRCHARADDR ; Screen addr in VDUADDR
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>>> WRTMAIN
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LDA VDUADDR+0 ; Copy addr to SHRVDUQ
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STA SHRVDUQ+0
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LDA VDUADDR+1
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STA SHRVDUQ+1
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>>> WRTAUX
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PLA ; Recover A
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PLY ; Flags -> Y
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>>> XF2MAIN,SHRCURSM
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SHRCURSRET >>> ENTAUX
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RTS
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SHRCURSBAIL PLA
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PLP
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RTS
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* Write character to SHR screen in 320 pixel mode
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SHRPRCH320 SEC
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SBC #32
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TAX
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LDA VDUSTATUS
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AND #$20 ; Bit 5 text@gfx cursor
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BEQ SHRPRCH320V4 ; VDU 4
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TXA
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>>> XF2MAIN,SHRVDU5CH ; VDU5
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SHRPRCH320RET >>> ENTAUX
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RTS
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SHRPRCH320V4 TXA
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CLC ; 65816 native mode
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XCE
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REP #$30 ; 16 bit M & X
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MX %00 ; Tell Merlin
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AND #$00FF
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STA VDUADDR2 ; A*32 -> VDUADDR2
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ASL VDUADDR2
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ASL VDUADDR2
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ASL VDUADDR2
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ASL VDUADDR2
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ASL VDUADDR2
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CLC ; SHRFONTXPLD+A*32 -> VDUADDR2
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LDA VDUADDR2
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ADC #SHRFONTXPLD
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STA VDUADDR2
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SEP #$30 ; 8 bit M & X
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MX %11 ; Tell Merlin
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LDA #$E1
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STA VDUBANK2
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JSR SHRCHARADDR ; Screen addr in VDUADDR
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* 65816 code contributed by John Brooks follows ...
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PHB ; Save data bank
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LDA VDUBANK2 ; Push font Bank onto stack
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PHA
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PLB ; Set data bank to font bank
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REP #$30 ; 16 bit M & X
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MX %00 ; Tell Merlin
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LDY VDUADDR2 ; Font src ptr
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LDX VDUADDR ; SHR dst ptr
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LDA !$000000,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10000,X ; Write 2 bytes to screen
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LDA !$000002,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10002,X ; Write 2 bytes to screen
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LDA !$000004,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E100A0,X ; Write 2 bytes to screen
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LDA !$000006,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E100A2,X ; Write 2 bytes to screen
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LDA !$000008,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10140,X ; Write 2 bytes to screen
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LDA !$00000A,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10142,X ; Write 2 bytes to screen
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LDA !$00000C,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E101E0,X ; Write 2 bytes to screen
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LDA !$00000E,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E101E2,X ; Write 2 bytes to screen
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LDA !$000010,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10280,X ; Write 2 bytes to screen
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LDA !$000012,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10282,X ; Write 2 bytes to screen
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LDA !$000014,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10320,X ; Write 2 bytes to screen
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LDA !$000016,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10322,X ; Write 2 bytes to screen
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LDA !$000018,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E103C0,X ; Write 2 bytes to screen
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LDA !$00001A,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E103C2,X ; Write 2 bytes to screen
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LDA !$00001C,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10460,X ; Write 2 bytes to screen
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LDA !$00001E,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10462,X ; Write 2 bytes to screen
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PLB ; Recover data bank
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SEC ; Back to emulation mode
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XCE
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MX %11 ; Tell Merlin
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RTS
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* Write character to SHR screen in 640 pixel mode
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SHRPRCH640 SEC
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SBC #32
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TAX
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LDA VDUSTATUS
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AND #$20 ; Bit 5 text@gfx cursor
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BEQ SHRPRCH640V4 ; VDU 4
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TXA
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>>> XF2MAIN,SHRVDU5CH ; VDU5
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* (Returns via SHRPRCH320RET)
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SHRPRCH640V4 TXA
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CLC ; 65816 native mode
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XCE
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REP #$30 ; 16 bit M & X
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MX %00 ; Tell Merlin
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AND #$00FF
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STA VDUADDR2 ; A*16 -> VDUADDR2
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ASL VDUADDR2
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ASL VDUADDR2
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ASL VDUADDR2
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ASL VDUADDR2
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CLC ; SHRFONTXPLD+A*16 -> VDUADDR2
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LDA VDUADDR2
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ADC #SHRFONTXPLD
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STA VDUADDR2
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SEP #$30 ; 8 bit M & X
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MX %11 ; Tell Merlin
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LDA #$E1
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STA VDUBANK2
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JSR SHRCHARADDR ; Screen addr in VDUADDR
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* 65816 code contributed by John Brooks follows ...
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PHB ; Save data bank
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LDA VDUBANK2 ; Push font Bank onto stack
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PHA
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PLB ; Set data bank to font bank
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REP #$30 ; 16 bit M & X
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MX %00 ; Tell Merlin
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LDY VDUADDR2 ; Font src ptr
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LDX VDUADDR ; SHR dst ptr
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LDA !$000000,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10000,X ; Write 2 bytes to screen
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LDA !$000002,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E100A0,X ; Write 2 bytes to screen
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LDA !$000004,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10140,X ; Write 2 bytes to screen
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LDA !$000006,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E101E0,X ; Write 2 bytes to screen
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LDA !$000008,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10280,X ; Write 2 bytes to screen
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LDA !$00000A,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10320,X ; Write 2 bytes to screen
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LDA !$00000C,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E103C0,X ; Write 2 bytes to screen
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LDA !$00000E,Y ; Read 2 bytes of exploded font
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JSR SHRCOLWORD
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STAL $E10460,X ; Write 2 bytes to screen
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PLB ; Recover data bank
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SEC ; Back to emulation mode
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XCE
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MX %11 ; Tell Merlin
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RTS
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* Apply colour masks to 16 bit word of character data
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* Called in 65816 native mode, 16 bit
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SHRCOLWORD MX %00 ; Tell Merlin 16 bit M & X
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PHA ; Keep A
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AND SHRCOLMASK ; Mask to set foreground colour
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STA ZP1 ; Keep foreground
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PLA ; Get original A back
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EOR #$FFFF ; Invert bits
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AND SHRBGMASK ; Apply background colour mask
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EOR ZP1 ; Combine with foreground
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RTS
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MX %11
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* Calculate character address in SHR screen memory
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* This is the address of the first pixel row of the char
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* Add $00A0 for each subsequent row
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SHRCHARADDR LDY VDUTEXTY
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LDA SHRTAB,Y ; MSB
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STA VDUADDR+1
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LDA VDUTEXTX
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ASL ; Mult x 2 (4 pixels/byte)
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LDY VDUPIXELS ; Pixels per byte
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CPY #$02 ; 2 pixels per byte in 320 mode
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BNE :S1
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ASL ; Mult x 2 (2 pixels/byte)
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:S1 STA VDUADDR+0 ; LSB of address
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LDA #$E1 ; Bank $E1
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STA VDUBANK
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RTS
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* (VDUADDR)=>character address, X=preserved
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* Advance VDUADDR to the next row of pixels
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SHRNEXTROW LDA VDUADDR+0 ; Add 160 to VDUADDR
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CLC
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ADC #160
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STA VDUADDR+0
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LDA VDUADDR+1
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ADC #$00
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STA VDUADDR+1
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RTS
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* Forwards scroll one line
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* Copy text line A+1 to line A
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* Note: Code for this courtesy Kent Dickey
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SHRSCR1LINE PHY
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PHX
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STA VDUADDR+1 ; Screen line -> MSB
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STZ VDUADDR+0 ; Zero LSB
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CLC ; Enter native mode
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XCE
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PHB ; Preserve data bank
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REP #$31 ; M,X 16 bit, carry clear
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MX %00 ; Tell Merlin
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LDA VDUADDR ; Screen line to scroll
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ASL ; Mult 4
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ASL
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ADC VDUADDR ; Mult 5
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STA VDUADDR ; VDUADDR = line * $500
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LDA TXTWINLFT ; Left margin
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LDY VDUPIXELS ; Pixels per byte
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CPY #$02 ; 2 pixels per byte in 320 mode
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BNE :S1
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ASL ; Double TXTWINLFT
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:S1 ASL ; 2 bytes / char
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AND #$00ff ; Mask to get 8 bit result
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ADC VDUADDR ; Add to beginning of line addr
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STA VDUADDR ; VDUADDR = start position
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SEP #$21 ; M 8 bit, X 16 bit, carry set
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MX %10 ; Tell Merlin
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LDA TXTWINRGT ; Compute width ..
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SBC TXTWINLFT ; .. right minus left
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LDY VDUPIXELS ; Pixels per byte
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CPY #$02 ; 2 pixels per byte in 320 mode
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BNE :S2
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ASL ; Double the width for 320
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INC A ; Plus one
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:S2 REP #$31 ; M,X 16 bit, carry clear
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MX %00 ; Tell Merlin
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ASL ; 2 bytes / char
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AND #$00ff ; Mask to get 8 bit result
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ADC VDUADDR ; Add to start position
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TAX ; Will use as index
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PEA #$E1E1 ; Set databank to $E1
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PLB
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PLB
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:LOOP1 LDA $2500,X ; 2 bytes, row 0
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STA $2000,X
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LDA $25A0,X ; row 1
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STA $20A0,X
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LDA $2640,X ; row 2
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STA $2140,X
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LDA $26E0,X ; row 3
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STA $21E0,X
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LDA $2780,X ; row 4
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STA $2280,X
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LDA $2820,X ; row 5
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STA $2320,X
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LDA $28C0,X ; row 6
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STA $23C0,X
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LDA $2960,X ; row 7
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STA $2460,X
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DEX ; Update index
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DEX
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BMI :DONE ; Jump out if odd->-ve
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CPX VDUADDR ; Compare with start addr
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BCS :LOOP1 ; Bytes left? Go again
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:DONE PLB ; Recover data bank
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SEC ; Back to emulation mode
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XCE
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PLX
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PLY
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RTS
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* Reverse scroll one line
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* Copy text line A to line A+1
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SHRRSCR1LINE PHY
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PHX
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STA VDUADDR+1 ; Screen line -> MSB
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STZ VDUADDR+0 ; Zero LSB
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CLC ; Enter native mode
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XCE
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PHB ; Preserve data bank
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REP #$31 ; M,X 16 bit, carry clear
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MX %00 ; Tell Merlin
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LDA VDUADDR ; Screen line to scroll
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ASL ; Mult 4
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ASL
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ADC VDUADDR ; Mult 5
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STA VDUADDR ; VDUADDR = line * $500
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LDA TXTWINLFT ; Left margin
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LDY VDUPIXELS ; Pixels per byte
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CPY #$02 ; 2 pixels per byte in 320 mode
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BNE :S1
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ASL ; Double TXTWINLFT
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:S1 ASL ; 2 bytes / char
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AND #$00ff ; Mask to get 8 bit result
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ADC VDUADDR ; Add to beginning of line addr
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STA VDUADDR ; VDUADDR = start position
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SEP #$21 ; M 8 bit, X 16 bit, carry set
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MX %10 ; Tell Merlin
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LDA TXTWINRGT ; Compute width ..
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SBC TXTWINLFT ; .. right minus left
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LDY VDUPIXELS ; Pixels per byte
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CPY #$02 ; 2 pixels per byte in 320 mode
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BNE :S2
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ASL ; Double the width for 320
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INC A ; Plus one
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:S2 REP #$31 ; M,X 16 bit, carry clear
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MX %00 ; Tell Merlin
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ASL ; 2 bytes / char
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AND #$00ff ; Mask to get 8 bit result
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ADC VDUADDR ; Add to start position
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TAX ; Will use as index
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PEA #$E1E1 ; Set databank to $E1
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PLB
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PLB
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:LOOP1 LDA $2000,X ; 2 bytes, row 0
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STA $2500,X
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LDA $20A0,X ; row 1
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STA $25A0,X
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LDA $2140,X ; row 2
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STA $2640,X
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LDA $21E0,X ; row 3
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STA $26E0,X
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LDA $2280,X ; row 4
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STA $2780,X
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LDA $2320,X ; row 5
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STA $2820,X
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LDA $23C0,X ; row 6
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STA $28C0,X
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LDA $2460,X ; row 7
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STA $2960,X
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DEX ; Update index
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DEX
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BMI :DONE ; Jump out if odd->-ve
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CPX VDUADDR ; Compare with start addr
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BCS :LOOP1 ; Bytes left? Go again
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:DONE PLB ; Recover data bank
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SEC ; Back to emulation mode
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XCE
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PLX
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PLY
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RTS
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* Clear from current location to EOL
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SHRCLREOL JSR SHRCHARADDR
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STZ VDUADDR+0 ; Addr of start of line
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LDA #$08 ; Eight rows of pixels
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STA :CTR
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INC TXTWINRGT
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:L0 LDA VDUTEXTX
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TAX
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ASL ; 2 bytes / char
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LDY VDUPIXELS ; Pixels per byte
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CPY #$02 ; 2 is 320-mode (MODE 1)
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BNE :S0
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ASL ; 4 bytes / char
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:S0 TAY
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:L1 CPX TXTWINRGT
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BCS :S1
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LDA SHRBGMASKA
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STA [VDUADDR],Y
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INY
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STA [VDUADDR],Y
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INY
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LDA VDUPIXELS ; Pixels per byte
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CMP #$02 ; 2 is 320-mode (MODE 1)
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BNE :S2
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LDA SHRBGMASKA
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STA [VDUADDR],Y
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INY
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STA [VDUADDR],Y
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INY
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:S2 INX
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BRA :L1
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:S1 JSR SHRNEXTROW
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DEC :CTR
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BNE :L0
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DEC TXTWINRGT
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RTS
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:CTR DB $00
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* VDU16 (CLG) clears the graphics window
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SHRCLEAR >>> XF2MAIN,SHRVDU16
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SHRCLRRET >>> ENTAUX
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RTS
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* Set text colour
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* A=text colour
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SHRSETTCOL PHA
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LDX VDUPIXELS ; Pixels per byte
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CPX #$02 ; 2 is 320-mode (MODE 1)
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BNE :MODE0
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AND #$80
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BEQ :FORE320
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PLA
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AND #$0F
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TAX
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LDA SHRCMASK320,X ; Lookup mask in table
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STAL SHRBGMASKL ; Set colour mask (BG)
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STAL SHRBGMASKL+1
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STA SHRBGMASKA
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RTS
|
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:FORE320 PLA
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AND #$0F
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TAX
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LDA SHRCMASK320,X ; Lookup mask in table
|
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STAL SHRCOLMASKL ; Set colour mask (FG)
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|
STAL SHRCOLMASKL+1
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RTS
|
|
:MODE0 AND #$80
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BEQ :FORE640
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PLA
|
|
AND #$03
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TAX
|
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LDA SHRCMASK640,X ; Lookup mask in table
|
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STAL SHRBGMASKL ; Set colour mask (BG)
|
|
STAL SHRBGMASKL+1
|
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STA SHRBGMASKA
|
|
RTS
|
|
:FORE640 PLA
|
|
AND #$03
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TAX
|
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LDA SHRCMASK640,X ; Lookup mask in table
|
|
STAL SHRCOLMASKL ; Set colour mask (FG)
|
|
STAL SHRCOLMASKL+1
|
|
RTS
|
|
|
|
|
|
* Set graphics colour
|
|
* A=gfx colour, X=gcol action
|
|
* GCOL actions:
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* 0 = SET pixel
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* 1 = ORA with pixel
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* 2 = AND with pixel
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* 3 = XOR with pixel
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* 4 = NOT pixel
|
|
* 5 = NUL no change to pixel
|
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* 6 = CLR clear pixel to background
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|
* 7 = UND undefined
|
|
SHRSETGCOL PHA
|
|
LDY VDUPIXELS ; Pixels per byte
|
|
CPY #$02 ; 2 is 320-mode (MODE 1)
|
|
BNE :MODE0
|
|
AND #$80
|
|
BEQ :FORE320
|
|
PLA
|
|
AND #$0F
|
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TAY
|
|
LDA SHRCMASK320,Y ; Lookup mask in table
|
|
>>> WRTMAIN
|
|
STA SHRGFXBGMASK
|
|
>>> WRTAUX
|
|
RTS
|
|
:FORE320 PLA
|
|
AND #$0F
|
|
TAY
|
|
LDA SHRCMASK320,Y ; Lookup mask in table
|
|
>>> WRTMAIN
|
|
STA SHRGFXFGMASK
|
|
STX SHRGFXACTION
|
|
>>> WRTAUX
|
|
RTS
|
|
:MODE0 AND #$80
|
|
BEQ :FORE640
|
|
PLA
|
|
AND #$03
|
|
TAY
|
|
LDA SHRCMASK640,Y ; Lookup mask in table
|
|
>>> WRTMAIN
|
|
STA SHRGFXBGMASK
|
|
>>> WRTAUX
|
|
RTS
|
|
:FORE640 PLA
|
|
AND #$03
|
|
TAY
|
|
LDA SHRCMASK640,Y ; Lookup mask in table
|
|
>>> WRTMAIN
|
|
STA SHRGFXFGMASK
|
|
STX SHRGFXACTION
|
|
>>> WRTAUX
|
|
RTS
|
|
|
|
|
|
* Wrapper to call SHRDEFPALM (which sets up default palette)
|
|
SHRDEFPAL >>> XF2MAIN,SHRDEFPALM
|
|
SHRDEFPALRET >>> ENTAUX
|
|
RTS
|
|
|
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|