171 lines
6.9 KiB
Plaintext
171 lines
6.9 KiB
Plaintext
________ _______ _______ ________ _______ _______ __
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| .| .| . ____|__ . __| . ____| .| .|
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| || O || || __ | || | || | O || ||-LGN
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| | | :| :| :|_| |__| :|__| :|____| :| :|____
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|__|__|__|___|___|_______|________|_______|___|___|_______|
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CALL OUR BOARDS
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THE NETWORK +1-32-2550-31623
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MAGICAL WORLD 1-213-272-7350
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Welcum to the wonderful World of Cyberspace.... +49-5-73141982
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/\_______
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/ ___ / · ° · ° · ° · ° · ° · ° · ° · ° · ° · SySoP: SiGMA SEVEN!
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\ \__\/__ __ ______ ____ __________ __ __ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
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/\____ \/ | ¬\/ . ¬\/ ¬\/ _¬\ ¬\/ | ¬\ Ami-Express REGISTERED
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/ \ / \ | \ |\ / /\ \ |/\/ | / | \ ~~~~~~~~~~~~~~~~~~~~~~
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\ \/ / | / |/ \ \__/ |\ | \ | / Co-Sysop: FORNAX!
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\______/\___ /\__/ /\____ \__| \___ /\___ / <<<<SYNERGY GHQ!>>>>
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¯¯ / ___/ ¯\__/ ¯\/ / ___/ / ___/ 250 Megz! - 250 Megz!
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° · ° ·\/¯· ° · ° · ° · ° · ° · °\/¯° · \/¯° dHM ---------------------
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Home of the World's first DMS Check and Adder! -*0Super Nintendo & Amiga0*-
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Version 1.0
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Corsair + Kari presents the first doc of Fami hardware register
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locations and brief explanation of them..
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If you would like to add any info found in this list please leave
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a mail message to Corsair or RamRaider on GRAVEYARD BBS +44-91-5160560
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or anything to do with the FAMICON/SNES..
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We have an INTERNET address if ya want it leave true e-mail!
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Or better still if ya can get the Programmers handbook (Both) please call
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and leave mail :) , or even the 100,000 quid SCSI SNASM board for FAMICON
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development :)
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Also if you want more info contact us the same way..
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We are esp looking for contacts to help get to grips with this new platform
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everybody welcome!
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Special greetings to Starr/QUARTEX and any other True Console Dude!
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Memory Map
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~~~~~~~~~~
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Bank Address
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~~~~ ~~~~~~~
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00- 0000-1fff Lo RAM (same as at $7e0000-$7e1fff)
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7d 2100-2142(?) Videochip Registers
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4300-437f DMA Registers
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8000-ffff ROM:This contains 32k block of game ROM.
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So, the games are divided to 32k chunks
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which locate always at address $8000-$ffff,
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but in different banks. This means that the first
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32k of game is at $008000-$00ffff and next 32k
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is at $018000-$01ffff etc.
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7e 0000-1fff Lo RAM (same as always at $0000-$1fff) \
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2000-ffff RAM \ I'm not sure about } 128k RAM??
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7f 0000-ffff RAM / this RAM /
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7f-ff all Not used???
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$ffec($fffc) contains reset vector and $ffea($fffa) is NMI vector. The NMI is
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actually vertical blank interrupt.
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Video Chip
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~~~~~~~~~~
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size loc.
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~~~~ ~~~~
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B 2100 Screen fade x000bbbb x=screen on/off b=brightness(0-f)
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B 2106 Screen Pixelation xxxxbbbb x=pixel size b=planes to expand
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B 2107 Plane 0 location in vram xxxxxxab x=address ab=32/64 width xy
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B 2108 Plane 1 location in vram xxxxxxab as above
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B 2109 Plane 2 location in vram xxxxxxab as above
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B 210a Plane 3 location in vram xxxxxxab as above
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B 210b Tile VRAM address aaaabbbb a=Playfield 0 b=Playfield 1
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B 210c Tile VRAM address ccccdddd c=Playfield 2 d=Playfield 3
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2B 210d Plane 0 scroll x 8+3 bits (0-7ff) put first 8 bits and then
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2B 210e Plane 0 scroll y 8+3 bits (0-7ff) 3 highest bits
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2B 210f Plane 1 scroll x as above
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2B 2110 Plane 1 scroll y as above
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2B 2111 Plane 2 scroll x as above
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2B 2112 Plane 2 scroll y as above
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2B 2113 Plane 3 scroll x as above
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2B 2114 Plane 3 scroll y as above
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B 2115 Video port control
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W 2116 Video port address (lo-hi)
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W 2118 Video port data (lo-hi) (address is incremented by 2)
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B 2121 Palette color nr
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B 2122 Palette color data
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B 212C Playfield Enable xxxxabcd a-d = playfield number..
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B 2133 Screen mode 0000ab0c a=Interlace Y b=Overscan c=Interlace X??
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2140-2142 Audio Registers????
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I/O
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~~~
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W B 420b Start dma (enable bits) bits: 76543210 = dma nr (8 DMA's)
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R B 4212 Pad ready to be read
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R W 4218 Pad 0 data 76543210 = A-B-Select-Start-U-D-L-R
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4219 76543210 = X-Y-Top Left-Top Right-0000
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R W 421a Pad 1 data as above
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R W 421c Pad 2 data as above
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R W 421e Pad 3 data as above
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DMA registers ($4300-$437f)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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B 43X0 DMA control reg??(not sure!)
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B 43X1 DMA destination (Access only to some of the video chip
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registers ($2100-$21ff)
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$18=video port $22=color palette
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W 43X2 Source address lo-hi 16 lowest bits
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B 43X4 Source Bank addr. 8 highest bits
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W 43X5 Transfer size lo-hi
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X=dma number (0-7) DMA #0= 4300-4305
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DMA #1= 4310-4315 ...
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DMA #7= 4370-4375
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Symbols: size: B=byte long 2B=put 2 bytes W=word long
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R=read only W=write only
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Screen Details
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~~~~~~~~~~~~~~
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Famicom Tile format is simple. Each Tile is 4 planes and 8x8 bits.
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32 bytes are used per Tile .
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PLANES 1 & 2 PLANES 3 & 4
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byte0 byte1 byte 16 byte 17
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byte2 byte3 byte 18 byte 19
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byte4 byte5 byte 20 byte 21
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..... .......
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byte14 byte15 byte 30 byte 31
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Screen Map
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~~~~~~~~~~
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Famicom can use only Tiles $0-$3ff, max 1024 chars.
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16 bits: YX?c ccNN NNNN NNNN
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fedc ba98 7654 3210
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Y = mirror y X = mirror x ?=unknown
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ccc = palette nr (8 palettes) NN.. = character number
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Screen Resolution is normally 32x30 - 64 bytes / line
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Screen VRAM Location
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~~~~~~~~~~~~~~~~~~~~
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Screen Width 32x32 offset for x,y 0,0 = 0
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Screen Width 64x32 offset for x,y 0,0 = 0
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33,0 = $400
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Screen Width 32x60 offset for x,y 0,0 = 0
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0,31 = $400
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Screen Width 64x60 offset for x,y 0,0 = 0
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33,0 = $400
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0,31 = $800
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33,31 = $c00
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As can be seen if a wider mode is selected the extra height/width follow
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after the main screen in memory.
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