2022-12-22 00:26:50 +00:00
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* 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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2022-12-22 18:44:40 +00:00
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* on Apple IIGS (640x200 4 colour, or 320x200 16 colour.)
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2022-12-22 00:26:50 +00:00
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*
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2022-12-23 01:58:38 +00:00
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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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2022-12-24 04:26:16 +00:00
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2022-12-23 03:37:46 +00:00
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* Colours in the following order.
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* For 16 colour modes ...
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* BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, ...
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* For 4 colour modes ...
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* BLACK, RED, YELLOW, WHITE
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PALETTE320 DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $00 ; GREEN
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DB $80, $08 ; YELLOW
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DB $08, $00 ; BLUE
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DB $08, $08 ; MAGENTA
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DB $88, $00 ; CYAN
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2022-12-24 02:11:32 +00:00
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DB $88, $08 ; WHITE
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2022-12-23 03:37:46 +00:00
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DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $00 ; GREEN
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DB $80, $08 ; YELLOW
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DB $08, $00 ; BLUE
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DB $08, $08 ; MAGENTA
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DB $88, $00 ; CYAN
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DB $88, $08 ; WHITE
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PALETTE640 DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $08 ; YELLOW
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DB $88, $08 ; WHITE
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DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $08 ; YELLOW
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DB $88, $08 ; WHITE
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DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $08 ; YELLOW
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DB $88, $08 ; WHITE
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DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $08 ; YELLOW
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DB $88, $08 ; WHITE
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2022-12-26 07:25:49 +00:00
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SHRCOLMASK DB $00 ; Colour mask foreground
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SHRBGMASK DB $00 ; Colour mask background
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2022-12-24 04:26:16 +00:00
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2022-12-25 01:16:20 +00:00
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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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2022-12-22 18:44:40 +00:00
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* Enable SHR mode
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2022-12-26 06:54:45 +00:00
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SHRVDU22 LDA #$18 ; Inhibit SHR & aux HGR shadowing
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2022-12-25 04:18:03 +00:00
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TSB SHADOW
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2022-12-22 18:44:40 +00:00
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LDA #$80 ; Most significant bit
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TSB NEWVIDEO ; Enable SHR mode
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2022-12-23 03:37:46 +00:00
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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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2022-12-24 02:11:32 +00:00
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LDA #SCB320 ; SCB for 320-mode
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2022-12-23 03:37:46 +00:00
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LDY #00 ; Palette offset
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2022-12-25 19:40:50 +00:00
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STZ CLR80VID ; 40 column text mode
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2022-12-23 03:37:46 +00:00
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BRA :S1
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2022-12-24 02:11:32 +00:00
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:MODE0 LDA #SCB640 ; SCB for 640-mode
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2022-12-23 03:37:46 +00:00
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LDY #32 ; Palette offset
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2022-12-25 19:40:50 +00:00
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STZ SET80VID ; 80 column text mode
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2022-12-23 03:37:46 +00:00
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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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LDX #$00
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2022-12-24 02:11:32 +00:00
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:L2 LDA PALETTE320,Y ; Offset in Y computed above
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2022-12-23 03:44:06 +00:00
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STAL $E19E00,X ; Palettes begin at $9E00 in $E1
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2022-12-23 03:37:46 +00:00
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INX
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INY
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2022-12-23 03:44:06 +00:00
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CPX #32 ; 32 bytes in palette
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2022-12-23 03:37:46 +00:00
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BNE :L2
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2022-12-26 06:54:45 +00:00
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JSR SHRXPLDFONT ; Explode font -> SHRFONTXPLD table
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2022-12-25 19:40:50 +00:00
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JSR VDU12 ; Clear text and SHR screen
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2022-12-22 18:44:40 +00:00
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RTS
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2022-12-22 00:26:50 +00:00
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2022-12-23 01:58:38 +00:00
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2022-12-26 06:54:45 +00:00
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SHRFONTXPLD EQU $A000 ; Explode SHR font to $E1:A000
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* Explode font to generate SHRFONTXPLD table
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* This is 2 bytes x 8 rows for each character in 640 mode
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* or 4 bytes x 8 rows for each character in 320 mode
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SHRXPLDFONT LDA #<SHRFONTXPLD ; Use VDUADDR to point to ..
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STA VDUADDR+0 ; .. start of table to write
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LDA #>SHRFONTXPLD
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STA VDUADDR+1
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LDA #$E1
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STA VDUBANK
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LDA #32 ; First char number
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:L1 JSR SHRXPLDCHAR ; Explode char A
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INC A
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CMP #128 ; 96 chars in FONT8
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BNE :L1
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RTS
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* Explode one character to location pointed to by VDUADDR
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* On entry: A - character to explode
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SHRXPLDCHAR PHA
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SEC
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2022-12-24 02:11:32 +00:00
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SBC #32
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STA ZP1+0 ; A*8 -> ZP1
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STZ ZP1+1
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ASL ZP1+0
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ROL ZP1+1
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ASL ZP1+0
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ROL ZP1+1
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ASL ZP1+0
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ROL ZP1+1
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CLC ; FONT8+A*8 -> ZP1
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LDA ZP1+0
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ADC #<FONT8
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STA ZP1+0
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LDA ZP1+1
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ADC #>FONT8
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STA ZP1+1
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LDY #$00 ; First row of char
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:L1 >>> RDMAIN
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LDA (ZP1),Y ; Load row of font
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>>> RDAUX
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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 :S1
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JSR SHRCHAR320
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BRA :S2
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:S1 JSR SHRCHAR640
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2022-12-26 06:54:45 +00:00
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:S2 LDX VDUPIXELS ; Pixels per byte
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CPX #$02 ; 2 is 320-mode (MODE 1)
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BNE :S3
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CLC ; 320 mode: add 4 to VDUADDR
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LDA VDUADDR+0
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ADC #$04
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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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BRA :S4
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:S3 CLC ; 640 mode: add 2 to VDUADDR
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LDA VDUADDR+0
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ADC #$02
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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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:S4 INY ; Next row of font
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2022-12-24 02:11:32 +00:00
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CPY #$08 ; Last row?
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BNE :L1
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2022-12-26 06:54:45 +00:00
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PLA
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2022-12-24 02:11:32 +00:00
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RTS
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* Draw one pixel row of font in 320 mode
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* 4 bytes per char, 4 bits per pixel
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2022-12-27 06:50:10 +00:00
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* On entry: A contains row of font data
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SHRCHAR320 PHY ; Preserve Y
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LDY #$00 ; Dest byte index
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:L0 STZ ZP2
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LDX #$00 ; Source bit index
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:L1 ASL ; MS bit -> C
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PHP ; Preserve C
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ROL ZP2 ; C -> LS bit
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PLP ; Recover C
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PHP
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ROL ZP2 ; C -> LS bit
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PLP ; Recover C
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PHP
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ROL ZP2 ; C -> LS bit
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PLP ; Recover C
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ROL ZP2 ; C -> LS bit
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INX
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CPX #$02 ; Processed two bits of font?
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BNE :L1
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PHA ; Preserve partially shifted font
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LDA ZP2
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2022-12-24 02:11:32 +00:00
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STA [VDUADDR],Y
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2022-12-27 06:50:10 +00:00
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PLA ; Recover partially shifted font
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2022-12-24 02:11:32 +00:00
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INY
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2022-12-27 06:50:10 +00:00
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CPY #$04 ; Done 4 bytes?
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BNE :L0
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PLY ; Recover Y
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2022-12-23 01:58:38 +00:00
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RTS
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2022-12-24 02:11:32 +00:00
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* Draw one pixel row of font in 640 mode
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* 2 bytes per char, 2 bits per pixel
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2022-12-27 06:50:10 +00:00
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* On entry: A contains row of font data
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SHRCHAR640 PHY ; Preserve Y
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LDY #$00 ; Dest byte index
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:L0 STZ ZP2
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2022-12-24 02:11:32 +00:00
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LDX #$00 ; Source bit index
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:L1 ASL ; MS bit -> C
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PHP ; Preserve C
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2022-12-25 04:27:08 +00:00
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ROL ZP2 ; C -> LS bit
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2022-12-24 02:11:32 +00:00
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PLP ; Recover C
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2022-12-25 04:27:08 +00:00
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ROL ZP2 ; C -> LS bit
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2022-12-24 02:11:32 +00:00
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INX
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2022-12-25 04:27:08 +00:00
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CPX #$04
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BNE :L1
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2022-12-27 06:50:10 +00:00
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PHA ; Preserve partially shifted font
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2022-12-25 04:27:08 +00:00
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LDA ZP2
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STA [VDUADDR],Y
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2022-12-27 06:50:10 +00:00
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PLA ; Recover partially shifted font
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INY
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CPY #$02 ; Done 2 bytes?
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BNE :L0
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PLY ; Recover Y
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2022-12-24 02:11:32 +00:00
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RTS
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2022-12-26 06:54:45 +00:00
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* Write character to SHR screen
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* On entry: A - character to write
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* TODO: This is for 640 mode only at the moment
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SHRPRCHAR SEC
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SBC #32
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STA VDUADDR2+0 ; A*16 -> VDUADDR2
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STZ VDUADDR2+1
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ASL VDUADDR2+0
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ROL VDUADDR2+1
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ASL VDUADDR2+0
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ROL VDUADDR2+1
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ASL VDUADDR2+0
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ROL VDUADDR2+1
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ASL VDUADDR2+0
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ROL VDUADDR2+1
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CLC ; SHRFONTXPLD+A*16 -> VDUADDR2
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LDA VDUADDR2+0
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ADC #<SHRFONTXPLD
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STA VDUADDR2+0
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LDA VDUADDR2+1
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ADC #>SHRFONTXPLD
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STA VDUADDR2+1
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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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2022-12-27 02:22:32 +00:00
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* 65816 code contributed by John Brooks follows ...
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2022-12-27 05:59:40 +00:00
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PHP ; Disable interrupts
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2022-12-27 02:58:24 +00:00
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SEI
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2022-12-27 02:22:32 +00:00
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PHB ; Save data bank
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LDA VDUADDR2+2 ; 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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2022-12-27 02:58:24 +00:00
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CLC ; 65816 native mode
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2022-12-27 02:22:32 +00:00
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XCE
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2022-12-27 02:58:24 +00:00
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REP #$30 ; 16 bit M & X
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MX %00 ; Tell Merlin
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2022-12-27 02:22:32 +00:00
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LDY VDUADDR2 ; Font src ptr
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LDX VDUADDR ; SHR dst ptr
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2022-12-27 05:59:40 +00:00
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LDA !$000000,Y ; Read 2 bytes of exploded font
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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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STAL $E100A0,X ; Write 2 bytes to screen
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LDA !$000004,Y ; Read 2 bytes of exploded font
|
|
|
|
|
STAL $E10140,X ; Write 2 bytes to screen
|
|
|
|
|
LDA !$000006,Y ; Read 2 bytes of exploded font
|
|
|
|
|
STAL $E101E0,X ; Write 2 bytes to screen
|
|
|
|
|
LDA !$000008,Y ; Read 2 bytes of exploded font
|
|
|
|
|
STAL $E10280,X ; Write 2 bytes to screen
|
|
|
|
|
LDA !$00000A,Y ; Read 2 bytes of exploded font
|
|
|
|
|
STAL $E10320,X ; Write 2 bytes to screen
|
|
|
|
|
LDA !$00000C,Y ; Read 2 bytes of exploded font
|
|
|
|
|
STAL $E103C0,X ; Write 2 bytes to screen
|
|
|
|
|
LDA !$00000E,Y ; Read 2 bytes of exploded font
|
|
|
|
|
STAL $E10460,X ; Write 2 bytes to screen
|
2022-12-27 02:58:24 +00:00
|
|
|
PLB ; Recover data bank
|
|
|
|
|
SEC ; Back to emulation mode
|
2022-12-27 02:22:32 +00:00
|
|
|
XCE
|
2022-12-27 02:58:24 +00:00
|
|
|
MX %11 ; Tell Merlin
|
|
|
|
|
PLP ; Normal service resumed
|
2022-12-26 06:54:45 +00:00
|
|
|
RTS
|
|
|
|
|
|
|
|
|
|
|
2022-12-26 07:25:49 +00:00
|
|
|
* Apply colour masks to byte of character data
|
|
|
|
|
SHRCOLBYTE PHA ; Keep A
|
|
|
|
|
AND SHRCOLMASK ; Mask to set foreground colour
|
|
|
|
|
STA ZP1 ; Keep foreground
|
|
|
|
|
PLA ; Get original A back
|
|
|
|
|
EOR #$FF ; Invert bits
|
|
|
|
|
AND SHRBGMASK ; Apply background colour mask
|
|
|
|
|
EOR ZP1 ; Combine with foreground
|
|
|
|
|
RTS
|
|
|
|
|
|
|
|
|
|
|
2022-12-23 01:58:38 +00:00
|
|
|
* Calculate character address in SHR screen memory
|
2022-12-24 02:11:32 +00:00
|
|
|
* This is the address of the first pixel row of the char
|
|
|
|
|
* Add $00A0 for each subsequent row
|
2022-12-25 01:16:20 +00:00
|
|
|
SHRCHARADDR LDY VDUTEXTY
|
|
|
|
|
LDA SHRTAB,Y ; MSB
|
|
|
|
|
STA VDUADDR+1
|
2022-12-24 02:11:32 +00:00
|
|
|
LDA VDUTEXTX
|
|
|
|
|
ASL ; Mult x 2 (4 pixels/byte)
|
|
|
|
|
LDY VDUPIXELS ; Pixels per byte
|
|
|
|
|
CPY #$02 ; 2 pixels per byte in 320 mode
|
2022-12-25 01:16:20 +00:00
|
|
|
BNE :S1
|
2022-12-24 02:11:32 +00:00
|
|
|
ASL ; Mult x 2 (2 pixels/byte)
|
2022-12-25 01:16:20 +00:00
|
|
|
:S1 STA VDUADDR+0 ; LSB of address
|
2022-12-24 02:11:32 +00:00
|
|
|
LDA #$E1 ; Bank $E1
|
|
|
|
|
STA VDUBANK
|
2022-12-23 01:58:38 +00:00
|
|
|
RTS
|
2022-12-24 02:11:32 +00:00
|
|
|
* (VDUADDR)=>character address, X=preserved
|
2022-12-23 01:58:38 +00:00
|
|
|
|
|
|
|
|
|
2022-12-24 06:06:40 +00:00
|
|
|
* Advance VDUADDR to the next row of pixels
|
|
|
|
|
SHRNEXTROW LDA VDUADDR+0 ; Add 160 to VDUADDR
|
|
|
|
|
CLC
|
|
|
|
|
ADC #160
|
|
|
|
|
STA VDUADDR+0
|
|
|
|
|
LDA VDUADDR+1
|
|
|
|
|
ADC #$00
|
|
|
|
|
STA VDUADDR+1
|
|
|
|
|
RTS
|
|
|
|
|
|
|
|
|
|
|
2022-12-23 01:58:38 +00:00
|
|
|
* Forwards scroll one line
|
2022-12-25 01:16:20 +00:00
|
|
|
* Copy text line A+1 to line A
|
2022-12-27 01:41:10 +00:00
|
|
|
* Note: Code for this courtesy Kent Dickey
|
2022-12-25 01:16:20 +00:00
|
|
|
* TODO: This is only for 640 mode at present
|
2022-12-27 03:29:29 +00:00
|
|
|
SHRSCR1LINE PHY
|
|
|
|
|
PHX
|
2022-12-27 03:42:31 +00:00
|
|
|
STA VDUADDR+1 ; Screen line -> MSB
|
|
|
|
|
STZ VDUADDR+0 ; Zero LSB
|
|
|
|
|
PHP ; Disable interrupts
|
2022-12-27 03:29:29 +00:00
|
|
|
SEI
|
2022-12-27 03:42:31 +00:00
|
|
|
CLC ; Enter native mode
|
2022-12-27 03:29:29 +00:00
|
|
|
XCE
|
2022-12-27 03:42:31 +00:00
|
|
|
PHB ; Preserve data bank
|
2022-12-27 03:29:29 +00:00
|
|
|
REP #$31 ; M,X 16 bit, carry clear
|
|
|
|
|
MX %00 ; Tell Merlin
|
2022-12-27 03:42:31 +00:00
|
|
|
LDA VDUADDR ; Screen line to scroll
|
|
|
|
|
ASL ; Mult 4
|
2022-12-27 03:29:29 +00:00
|
|
|
ASL
|
2022-12-27 03:42:31 +00:00
|
|
|
ADC VDUADDR ; Mult 5
|
2022-12-27 03:29:29 +00:00
|
|
|
STA VDUADDR ; VDUADDR = line * $500
|
2022-12-27 03:42:31 +00:00
|
|
|
LDA TXTWINLFT ; Left margin
|
|
|
|
|
ASL ; 2 bytes / char
|
|
|
|
|
AND #$00ff ; Mask to get 8 bit result
|
|
|
|
|
ADC VDUADDR ; Add to beginning of line addr
|
|
|
|
|
STA VDUADDR ; VDUADDR = start position
|
2022-12-27 03:29:29 +00:00
|
|
|
SEP #$21 ; M 8 bit, X 16 bit, carry set
|
|
|
|
|
MX %10 ; Tell Merlin
|
2022-12-27 03:42:31 +00:00
|
|
|
LDA TXTWINRGT ; Compute width ..
|
|
|
|
|
SBC TXTWINLFT ; .. right minus left
|
2022-12-27 03:29:29 +00:00
|
|
|
REP #$31 ; M,X 16 bit, carry clear
|
|
|
|
|
MX %00 ; Tell Merlin
|
2022-12-27 03:42:31 +00:00
|
|
|
ASL ; 2 bytes / char
|
|
|
|
|
AND #$00ff ; Mask to get 8 bit result
|
|
|
|
|
ADC VDUADDR ; Add to start position
|
|
|
|
|
TAX ; Will use as index
|
|
|
|
|
PEA #$e1e1 ; Set databank to $E1
|
2022-12-27 03:29:29 +00:00
|
|
|
PLB
|
|
|
|
|
PLB
|
|
|
|
|
:LOOP1 LDA $2500,x ; 2 bytes, row 0
|
|
|
|
|
STA $2000,x
|
|
|
|
|
LDA $25a0,x ; row 1
|
|
|
|
|
STA $20a0,x
|
|
|
|
|
LDA $2640,x ; row 2
|
|
|
|
|
STA $2140,x
|
|
|
|
|
LDA $26e0,x ; row 3
|
|
|
|
|
STA $21e0,x
|
|
|
|
|
LDA $2780,x ; row 4
|
|
|
|
|
STA $2280,x
|
|
|
|
|
LDA $2820,x ; row 5
|
|
|
|
|
STA $2320,x
|
|
|
|
|
LDA $28c0,x ; row 6
|
|
|
|
|
STA $23c0,x
|
|
|
|
|
LDA $2960,x ; row 7
|
2022-12-27 05:59:40 +00:00
|
|
|
STA $2460,x
|
2022-12-27 03:42:31 +00:00
|
|
|
DEX ; Update index
|
2022-12-27 03:29:29 +00:00
|
|
|
DEX
|
2022-12-27 03:42:31 +00:00
|
|
|
BMI :DONE ; Jump out if odd->-ve
|
|
|
|
|
CPX VDUADDR ; Compare with start addr
|
|
|
|
|
BCS :LOOP1 ; Bytes left? Go again
|
|
|
|
|
:DONE PLB ; Recover data bank
|
|
|
|
|
SEC ; Back to emulation mode
|
2022-12-27 03:29:29 +00:00
|
|
|
XCE
|
2022-12-27 03:42:31 +00:00
|
|
|
PLP ; Recover flags + regs
|
2022-12-27 03:29:29 +00:00
|
|
|
PLX
|
|
|
|
|
PLY
|
|
|
|
|
RTS
|
2022-12-23 01:58:38 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
* Reverse scroll one line
|
2022-12-25 01:16:20 +00:00
|
|
|
* Copy text line A to line A+1
|
2022-12-25 04:18:03 +00:00
|
|
|
* TODO: Implement this
|
2022-12-23 01:58:38 +00:00
|
|
|
SHRRSCR1LINE
|
|
|
|
|
RTS
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
* Clear from current location to EOL
|
2022-12-24 06:06:40 +00:00
|
|
|
* TODO: This is only for 640 mode at present
|
|
|
|
|
SHRCLREOL JSR SHRCHARADDR
|
|
|
|
|
STZ VDUADDR+0 ; Addr of start of line
|
2022-12-25 01:16:20 +00:00
|
|
|
LDA #$08 ; Eight rows of pixels
|
2022-12-24 06:06:40 +00:00
|
|
|
STA :CTR
|
2022-12-24 06:11:15 +00:00
|
|
|
INC TXTWINRGT
|
2022-12-24 06:06:40 +00:00
|
|
|
:L0 LDA VDUTEXTX
|
|
|
|
|
TAX
|
|
|
|
|
ASL ; 2 bytes / char
|
|
|
|
|
TAY
|
2022-12-26 07:58:21 +00:00
|
|
|
LDA SHRBGMASK
|
2022-12-24 06:06:40 +00:00
|
|
|
:L1 CPX TXTWINRGT
|
|
|
|
|
BCS :S1
|
|
|
|
|
STA [VDUADDR],Y
|
|
|
|
|
INY
|
|
|
|
|
STA [VDUADDR],Y
|
|
|
|
|
INY
|
|
|
|
|
INX
|
|
|
|
|
BRA :L1
|
|
|
|
|
:S1 JSR SHRNEXTROW
|
|
|
|
|
DEC :CTR
|
|
|
|
|
BNE :L0
|
2022-12-24 06:11:15 +00:00
|
|
|
DEC TXTWINRGT
|
2022-12-23 01:58:38 +00:00
|
|
|
RTS
|
2022-12-24 06:06:40 +00:00
|
|
|
:CTR DB $00
|
2022-12-23 01:58:38 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
* VDU16 (CLG) clears the whole SHR screen right now
|
2022-12-23 04:16:39 +00:00
|
|
|
SHRCLEAR PHP ; Disable interrupts
|
|
|
|
|
SEI
|
|
|
|
|
CLC ; 816 native mode
|
2022-12-23 03:37:46 +00:00
|
|
|
XCE
|
2022-12-24 06:11:15 +00:00
|
|
|
REP #$10 ; 16 bit index
|
|
|
|
|
MX %10 ; Tell Merlin
|
|
|
|
|
LDX #$0000
|
|
|
|
|
LDA #$00
|
|
|
|
|
:L1 STAL $E12000,X ; SHR screen @ E1:2000
|
2022-12-23 03:37:46 +00:00
|
|
|
INX
|
2022-12-24 06:11:15 +00:00
|
|
|
CPX #$7D00
|
|
|
|
|
BNE :L1
|
|
|
|
|
SEP #$10 ; Back to 8 bit index
|
|
|
|
|
MX %11 ; Tell Merlin
|
2022-12-23 03:37:46 +00:00
|
|
|
SEC ; Back to 6502 emu mode
|
|
|
|
|
XCE
|
2022-12-23 04:16:39 +00:00
|
|
|
PLP ; Normal service resumed
|
2022-12-23 01:58:38 +00:00
|
|
|
RTS
|
|
|
|
|
|
|
|
|
|
|
2022-12-24 04:26:16 +00:00
|
|
|
* Set text colour
|
|
|
|
|
* A=txt colour
|
2022-12-25 04:18:03 +00:00
|
|
|
* TODO: Need to add support for 320 mode also
|
2022-12-26 07:25:49 +00:00
|
|
|
SHRSETTCOL PHA
|
|
|
|
|
AND #$80
|
|
|
|
|
BEQ :FOREGND
|
|
|
|
|
PLA
|
|
|
|
|
AND #$03
|
|
|
|
|
TAX
|
|
|
|
|
LDA :MASKS640,X ; Lookup mask in table
|
|
|
|
|
STA SHRBGMASK ; Set colour mask (BG)
|
|
|
|
|
RTS
|
|
|
|
|
:FOREGND PLA
|
|
|
|
|
AND #$03
|
2022-12-25 19:40:50 +00:00
|
|
|
TAX
|
2022-12-24 04:26:16 +00:00
|
|
|
LDA :MASKS640,X ; Lookup mask in table
|
2022-12-26 07:25:49 +00:00
|
|
|
STA SHRCOLMASK ; Set colour mask (FG)
|
2022-12-24 04:26:16 +00:00
|
|
|
RTS
|
|
|
|
|
:MASKS640 DB %00000000
|
|
|
|
|
DB %01010101
|
|
|
|
|
DB %10101010
|
|
|
|
|
DB %11111111
|
|
|
|
|
|
|
|
|
|
|
