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-+- QUARTEX UKHQ (AMIGA & CONSOLE) -+- & -+- TRSi UKHQ (IBM/PC) -+-
; Corsair presents an example of how to drive the hardware - basically I used this intro
; cos everyone knows how it looks and thus it seemed a good bit of code to do..
; the comments outside the hardware stuff are a bit sparse - i'm not teaching you how
; Fairlight write code , just their use of hardware!!
;
; questions as usual leave on GRAVEYARD, Treasure Island or Oasis..
;
Start Of Intro From Fairlight
------------------------------------------------
00E000 78 SEI ; disable irq ints
00E001 A9 8F LDA #$8F ;
00E003 8D 00 21 STA Screen_Fader ; turn screen on at full brightness
00E006 9C 00 42 STZ $4200 ;
00E009 9C 0C 42 STZ Start_DMA_Hi ; disable all 8 DMA channels
00E00C 9C 0B 42 STZ Start_DMA_Lo ;
00E00F 18 CLC ;
00E010 FB XCE ; place in native (16 bit) mode
00E011 C2 30 REP #$30 ; set x,y,a all to 16 bit
00E013 A9 00 00 LDA #$0000 ;
00E016 5B TCD ; set direct register to bank zero
00E017 64 07 STZ $07 ; clear memory loc. 7
00E019 A9 20 00 LDA #$0020 ;
00E01C 85 0B STA $0B ; set $0b.w = $0020
00E01E E2 20 SEP #$20 ; set accum. to 8 bit
00E020 A9 80 LDA #$80 ;
00E022 8D 15 21 STA Video_Port_Control ; initialise Video Port Controller
00E025 A2 00 10 LDX #$1000 ;
00E028 8E 16 21 STX Video_Port_Address ; Point Vram Pointer To $1000
00E02B A9 5B LDA #$5B ;
00E02D 85 0D STA $0D ; Copies $5bx8 bytes of char
00E02F A2 00 00 LDX #$0000 ; data into Video Ram via the port
outer_loop: ; thus giving 2
00E032 A0 08 00 LDY #$0008 ;
inner_loop: ;
00E035 BD D3 E2 LDA CHAR_SET,X ; .: Character set for intro
00E038 8D 18 21 STA Video_Port_Lo ; and FLT logo.
00E03B 9C 19 21 STZ Video_Port_Hi ;
00E03E E8 INX ;
00E03F 88 DEY ;
00E040 D0 F3 BNE inner_loop ;
00E042 C6 0D DEC $0D ;
00E044 D0 EC BNE outer_loop ;
00E046 9C 05 21 STZ $2105 ; clear Video Reg. unknown
00E049 A9 04 LDA #$04 ; set Playfield 0 To $400 and 32x32 chars
00E04B 8D 07 21 STA Playfield_0_Addr ;
00E04E A9 08 LDA #$08 ; set Playfield 1 to $800 and 32x32 chars
00E050 8D 08 21 STA Playfield_1_Addr ;
00E053 A9 11 LDA #$11 ; Set Playfield 0+1 Tile Addr To $100
00E055 8D 0B 21 STA Tile01_Vram_Addr ;
00E058 A2 07 00 LDX #$0007 ;
00E05B 9E 0D 21 STZ Plane_0_Scroll_X,X ; Clear All The Scroll Pointers
00E05E 9E 0D 21 STZ Plane_0_Scroll_X,X ;
00E061 CA DEX ;
00E062 10 F7 BPL $00E05B ;
00E064 A2 07 00 LDX #$0007 ;
00E067 9E 23 21 STZ $2123,X ; Clear Video Registers $2123-$212a
00E06A CA DEX ;
00E06B 10 FA BPL $00E067 ;
00E06D A9 03 LDA #$03 ;
00E06F 8D 2C 21 STA Playfield_Enable ; Enable playfields 0 & 1
00E072 A2 04 00 LDX #$0004 ;
00E075 9E 2D 21 STZ $212D,X ; Clear Video Registers $212d-$2130
00E078 CA DEX ;
00E079 10 FA BPL $00E075 ;
00E07B 9C 33 21 STZ Interlace_Flags ; Disable Interlace Mode
00E07E A9 04 LDA #$04 ;
00E080 9C 16 21 STZ Video_Port_Address ; Set Video Port Address to $400
00E083 8D 17 21 STA Video_Port_Address+1 ;
00E086 A9 80 LDA #$80 ;
00E088 8D 15 21 STA Video_Port_Controller ; Initialise Video Controller
00E08B A2 00 08 LDX #$0800 ;
00E08E 9C 19 21 STZ Video_Port_Data+1 ; Clear $800 bytes of Vram from $400 upwards
00E091 CA DEX ;
00E092 D0 FA BNE $00E08E ;
00E094 A2 AB E5 LDX #$E5AB ; Display Text From $e5ab on..
00E097 20 3E E2 JSR DO_TEXT ;
00E09A A9 08 LDA #$08 ;
00E09C 9C 16 21 STZ Video_Port_Address ; Set Video Port Address to $800
00E09F 8D 17 21 STA Video_Port_Address+1 ;
00E0A2 9C 15 21 STZ Video_Port_Controller ; Clear Video Port Controller
00E0A5 A2 00 00 LDX #$0000 ;
00E0A8 BD 91 E6 LDA $E691,X ; Copy $a0 bytes down into Vram location
00E0AB 8D 18 21 STA Video_Port_Data ; $800 onwards
00E0AE E8 INX ;
00E0AF E0 A0 00 CPX #$00A0 ;
00E0B2 D0 F4 BNE $E0A8 ;
00E0B4 A9 20 LDA #$20 ;
00E0B6 8D 18 21 STA Video_Port_Data ; Fill One Screen Worth of VRAM with
00E0B9 E8 INX ; spaces
00E0BA E0 00 04 CPX #$400 ;
00E0BD D0 F7 BNE $E0B6 ;
00E0BF A9 A8 LDA #$A8 ;
00E0C1 8D 00 0C STA $0C00 ; $c00 = $a8
00E0C4 8D 00 0D STA $0D00 ; $d00 = $a8
00E0C7 A9 21 LDA #$21 ;
00E0C9 A2 00 00 LDX #$0000 ; set $c01-$c028 = $21
00E0CC 9D 01 0C STA $0C01,X ;
00E0CF E8 INX ; ie set up the color pointer table
00E0D0 E0 28 00 CPX #$0028 ;
00E0D3 D0 F7 BNE $E0CC ;
00E0D5 A9 F8 LDA #$F8 ;
00E0D6 F8 SED ; set decimal flag on
00E0D7 9D 01 0C STA $0C01,X ;
00E0DA A9 01 LDA #$01 ; set more low memory
00E0DC 9D 02 0C STA $0C02,X ;
00E0DF E8 INX ;
00E0E0 E0 A0 00 CPX #$00A0 ; and further color palette set-up
00E0E3 D0 F7 BNE $E0DC ;
00E0E5 9e 02 0C STZ $C02,X ;
00E0E8 A9 0B LDA #$0B ;
00E0EA A2 00 00 LDX #$0000 ; set even more low memory
00E0ED 9D 01 0D STA $0D01,X ; - seems to set it to $b and then clear it??
00E0F0 E8 INX ;
00E0F1 9E 01 0D STZ $0D01,X ;
00E0F4 1A INC A ; pallete data set up
00E0F5 E8 INX ;
00E0F6 E0 28 00 CPX #$0028 ;
00E0F9 D0 F2 BNE $E0ED ;
00E0FB 9D 01 0D STA $0D01,X ;
00E0FE E8 INX ;
00E0FF 9E 01 0D STZ $0D01,X ;
00E102 3A DEC A ; and more 'irelevant' low mem stuff
00E103 E8 INX ;
00E104 E0 50 CPX #$0050 ; more palette data set-up
00E107 D0 F2 BNE $E0FB ;
00E109 A9 F8 LDA #$F8 ;
00E10B 9D 01 0D STA $0D01,X ;
00E10E A9 FF LDA #$FF ; and more 'irelevant' low mem stuff
00E110 9D 02 0D STA $0D02,X ;
00E113 E8 INX ; more palette data set-up
00E114 E0 40 01 CPX #$0140 ;
00E117 D0 F7 BNE $E109 ;
00E119 9E 02 0D STZ $D02,X ;
00E11C 9C 0C 42 STZ DMA_Enable ; Disable all DMA channels
00E11F 9C 10 43 STZ DMA_Control_1 ;
00E122 A9 02 LDA #$02 ; set up control regs for channel 1+2
00E124 8D 20 43 STA DMA_Control_2 ;
00E127 A9 21 LDA #$21 ; Select pallete pointer + color for
00E129 8D 11 43 STA DMA_Destination_1 ; DMA dump destination
00E12C 1A INC A ;
00E12D 8D 21 43 STA DMA_Destination_2 ;
00E130 A2 00 0C LDX #$0C00 ;
00E133 8E 12 43 STX DMA_Source_Addr_1 ; Palette numbers from $0c00
00E136 A2 00 0D LDX #$0D00 ;
00E139 8E 22 43 STX DMA_Source_Addr_2 ; Palette data from $0d00
00E13C 9C 14 43 STZ DMA_Source_Bank_1 ;
00E13F 9C 24 43 STZ DMA_Source_Bank_2 ;
00E142 A9 06 LDA #$06 ; turn on DMA channels 1+2
00E144 8D 0C 42 STA DMA_Enable ;
00E147 A9 0F LDA #$0F ; turn off screen
00E149 8D 00 21 STA Screen_Fader ;
00E14C A9 01 LDA #$01 ;
00E14E 8D 00 42 STA $4200 ; errmm
00E151 20 C1 E1 JSR Pad_Poll_Hi ; Wait for poll hi
00E154 9C 21 21 STZ Palette_Color_Pointer ;
00E157 9C 22 21 STZ Palette_Color_Data ; set background to black
00E15A 9C 22 21 STZ Palette_Color_Data ;
00E15D 4C 97 E1 JMP $00E197
------------------------------------------------
00E160 20 C1 E1 JSR Pad_Poll_Hi ; wait for poll hi
00E163 20 13 E2 JSR PROC_B
00E166 AD 12 42 LDA Pad_Poll ; Wait until a button has been
00E169 4A LSR A ; pressed
00E16A B0 FA BCS $00E166 ;
00E16C 20 CD E1 JSR PROC_A ;
00E16F A9 F0 LDA #$F0 ;
00E171 25 0A AND $0A ;
00E173 F0 46 BEQ $00E1BB ;
00E175 5C 00 80 00 JMP GAME ; and run the game..
------------------------------------------------
00E179 A9 01 LDA #$01 ;
00E17B A2 01 00 LDX #$0001 ;
00E17E 20 C1 E1 JSR Pad_Poll_Hi ;
00E181 8D 06 21 STA Pixelation ;
00E184 20 C7 E1 JSR Pad_Poll_Lo ;
00E187 CA DEX ;
00E188 10 F4 BPL $00E17E ;
00E18A 18 CLC ;
00E18B 69 10 ADC #$10 ;
00E18D C9 01 CMP #$01 ;
00E18F D0 EA BNE $00E17B ;
00E191 20 40 E2 JSR $00E240 ;
00E194 20 C7 E1 JSR Pad_Poll_Lo ;
00E197 20 C1 E1 JSR Pad_Poll_Hi ; wait for b7 pad_poll to go hi.
00E19A 20 13 E2 JSR PROC_B ;
00E19D A9 F1 LDA #$F1 ;
00E19F A2 01 00 LDX #$0001 ; 'Reverse Pixelate' the text into vision
00E1A2 20 C1 E1 JSR Pad_Poll_Hi ;
00E1A5 8D 06 21 STA Pixelation ;
00E1A8 20 C7 E1 JSR Pad_Poll_Lo ;
00E1AB CA DEX ;
00E1AC 10 F4 BPL $00E1A2 ;
00E1AE 38 SEC ;
00E1AF E9 10 SBC #$10 ;
00E1B1 C9 F1 CMP #$F1 ;
00E1B3 D0 EA BNE $00E19F ;
00E1B5 20 C1 E1 JSR Pad_Poll_Hi ;
00E1B8 9C 06 21 STZ Pixelation ; set pixels to normal.
00E1BB 20 C7 E1 JSR Pad_Poll_Lo ;
00E1BE 4C 60 E1 JMP $00E160 ; and jump into the main loop
------------------------------------------------
00E1C1 2C 12 42 Pad_Poll_Hi BIT Pad_Poll ; wait until bit 7 of pad_ready goes hi
00E1C4 10 FB BPL Pad_Poll_Hi ;
00E1C6 60 RTS ;
------------------------------------------------
00E1C7 2C 12 42 Pad_Poll_Lo BIT Pad_Poll ;
00E1CA 30 FB BMI Pad_Poll_Lo ; wait until bit 7 of pad_ready goes lo
00E1CC 60 RTS ;
------------------------------------------------
00E1CD C2 20 PROC_A REP #$20 ; 16 bit accum.
00E1CF A2 00 00 LDX #$0000 ;
00E1D2 A9 FF 7F LDA #$7FFF ;
00E1D5 E4 0B CPX $0B ;
00E1D7 F0 07 BEQ $00E1E0 ; set up table of $7fff in memory
00E1D9 9D B0 0D STA $0DB0,X ;
00E1DC E8 INX ;
00E1DD E8 INX ;
00E1DE 80 F5 BRA $00E1D5 ;
00E1E0 A0 00 00 LDY #$0000 ; and then follow the table with 5 zeros
00E1E3 B9 C3 E2 LDA $E2C3,Y ;
00E1E6 9D B0 0D STA $0DB0,X ;
00E1E9 C8 INY ;
00E1EA C8 INY ;
00E1EB E8 INX ;
00E1EC E8 INX ;
00E1ED C0 10 00 CPY #$0010 ;
00E1F0 D0 F1 BNE $00E1E3 ;
00E1F2 A9 FF 7F LDA #$7FFF ; and if x<>$90 then add more $7fff's
00E1F5 E0 90 00 CPX #$0090 ;
00E1F8 F0 07 BEQ $00E201 ;
00E1FA 9D B0 0D STA $0DB0,X ;
00E1FD E8 INX ;
00E1FE E8 INX ;
00E1FF 80 F4 BRA $00E1F5 ;
------------------------------------------------
00E201 A6 07 LDX $07 ; preserve old pad data
00E203 AD 18 42 LDA Pad_0_Data_Lo ; get new data
00E206 85 07 STA $07 ; and store it as the old
00E208 8A TXA ; wop it in accum.
00E209 49 FF FF EOR #$FFFF ; not the old data
00E20C 25 07 AND $07 ; and then use as a mask on new data
00E20E 85 09 STA $09 ; and then store in 9
00E210 E2 20 SEP #$20 ; and back to 8 bit accum..
00E212 60 RTS ; and back..
------------------------------------------------
00E213 9C 15 21 PROC_B STZ Video_Port_Control ; Reset Video Port
00E216 A9 04 LDA #$04 ;
00E218 9C 16 21 STZ Video_Port_Addr ; set video ram pointer to $400
00E21B 8D 17 21 STA Video_Port_Addr_Hi ;
00E21E 9C 19 21 STZ Video_Port_Data_Hi ;
00E221 9C 00 43 STZ DMA_Control_0 ; reset dma controller #0
00E224 A9 18 LDA #$18 ;
00E226 8D 01 43 STA DMA_Destination_0 ; point dma #0 to vram
00E229 A2 00 04 LDX #$0400 ;
00E22C 8E 02 43 STX DMA_Source_Addr_0 ; copy from address $400 to vram
00E22F 9C 04 43 STZ DMA_Source_Bank_0 ;
00E232 A2 00 04 LDX #$0400 ; copy $400 bytes into vram
00E235 8E 05 43 STX DMA_Size_0 ;
00E238 A9 01 LDA #$01 ; and enable dma #0
00E23A 8D 0B 42 STA DMA_Enable ;
00E23D 60 RTS
------------------------------------------------
00E23E 86 00 DO_TEXT STX $00 ; store text location
00E240 A2 00 04 LDX #$0400 ; set pointer to text
00E243 86 02 STX $02 ; store text location again
00E245 64 06 STZ $06 ; clear 6
00E247 A2 00 00 LDX #$0000 ;
00E24A B2 00 LDA ($00) ; get next char
00E24C 30 55 BMI $00E2A3 ; if bit 7 set then off we go..
00E24E C9 20 CMP #$20 ; is it a space
00E250 90 11 BCC $00E263 ; branch if less than a space..
00E252 92 02 STA ($02) ; store char
00E254 E8 INX ;
00E255 E6 00 INC $00 ; next char
00E257 D0 02 BNE $00E25B ;
00E259 E6 01 INC $01 ;
00E25B E6 02 INC $02 ; next dest spot
00E25D D0 EB BNE $00E24A ;
00E25F E6 03 INC $03 ;
00E261 80 E7 BRA $00E24A ;
------------------------------------------------
00E263 E6 00 INC $00 ; increment counter
00E265 D0 02 BNE $00E269 ; if not end of 255 boundary skip
00E267 E6 01 INC $01 ; increment hi byte of pointer
00E269 48 PHA ;
00E26A A9 20 LDA #$20 ;
00E26C E0 20 CPX #$0020 ;
00E26F F0 0B BEQ $E27C ;
00E271 92 02 STA ($02) ; basically these routines strip
00E273 E8 INX ; chars unnecessary and prepare the
00E274 E6 02 INC $02 ; text for output..
00E276 D0 F4 BNE $00E26C ;
00E278 E6 03 INC $03 ; these lines increment the 16 bit pointer
00E27A 80 F0 BRA $00E26C ; as 2 8 bit pointers
------------------------------------------------
00E27C 68 PLA ;
00E27D A2 00 00 LDX #$0000 ;
00E280 E6 06 INC $06 ;
00E282 C5 06 CMP $06 ;
00E284 D0 E3 BNE $00E269 ;
00E286 B2 00 LDA ($00) ;
00E288 E6 00 INC $00 ;
00E28A D0 02 BNE $00E28E ;
00E28C E6 01 INC $01 ;
00E28E 85 0D STA $0D ;
00E290 64 0E STZ $0E ;
00E292 A9 20 LDA #$20 ;
00E294 E4 0D CPX $0D ;
00E296 F0 B2 BEQ $00E24A ;
00E298 92 02 STA ($02) ;
00E29A E8 INX ;
00E29B E6 02 INC $02 ;
00E29D D0 02 BNE $00E2A1 ; and again increment pointer as 2 8 bit
00E29F E6 03 INC $03 ;
00E2A1 80 F1 BRA $00E294 ;
------------------------------------------------
00E2A3 A5 06 LDA $06 ;
00E2A5 C9 20 CMP #$20 ;
00E2A7 F0 19 BEQ $00E2C2 ;
00E2A9 A9 20 LDA #$20 ;
00E2AB E0 20 CPX #$0020 ;
00E2AE F0 0B BEQ $E2BB ;
00E2B0 92 02 STA ($02) ;
00E2B2 E8 INX ;
00E2B3 E6 02 INC $02 ;
00E2B5 D0 F4 BNE $00E2AB ;
00E2B7 E6 03 INC $03 ;
00E2B9 80 F0 BRA $00E2AB ;
------------------------------------------------
00E2BB A2 00 00 LDX #$0000 ;
00E2BE E6 06 INC $06 ;
00E2C0 80 E1 BRA $00E2A3 ;
00E2C2 60 RTS ;
------------------------------------------------
The End..
[0m[0 p [0;36m
[0;36m _ _
[0;36m /(__ __ ________ __ __ ________ __ /(__ ________
[0;36m /\ \ \/ \/ __ \/ \ / \/ __ \/ \ \ \/ __ \
[0;36m / \ / / / /_/ / / / / /_/ / \/ / /_/ /
[0;36m _ / \/ / / __/ / / / __ / / __ /
[0;36m /(_/ / / /\ \/ / / / / / / /\ / / / / _
[0;36m / /\ / / / \ \ \/ / / / / / \ / / \ \_)\
[0;36m \_____/ \__/\__/\__/ \__/\______/\__/ \__/\__/ \/\__/ \_____/
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