214 lines
7.8 KiB
Plaintext
214 lines
7.8 KiB
Plaintext
ATARI 7800 BANKSWITCHING GUIDE
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(c) copyright by Eckhard Stolberg (Eckhard_Stolberg@web.de)
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last modified on February 25, 2003 (version 1.00)
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Thanks to:
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Lee Krueger, Graham Percy, Dan Boris, Chad Schell and Mitch Orman
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==============================================================================
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7800 games can use the memory from $0400 to $047f, from $0500
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to $17ff and from $2800 to $ffff, but only the High-Score cart
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uses anything below $4000. It has 4KB of ROM at $3000-$3fff
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and 2KB of battery-backed RAM at $1000-$17ff.
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The non bankswitching games (7808, 7816, 7832 and 7848) just
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use the specified amount of ROM from $ffff downwards.
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Then there are several different types of Atari's SuperGame
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bankswitching. It basically consists of 8 16KB banks (0-7)
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that can be mapped in at $8000-$bfff. Bank 7 always is fixed
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at $c000-$ffff. To map in a chosen bank into $8000-$bfff you
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write it's bank number (0-7) to any address between $8000-bfff.
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The contend of $4000-$7fff differs between different variations
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of this type:
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Some games have nothing connected in this area and return only
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random data.
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Some games have bank 6 fixed at this area.
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Some games have 16K of extra ROM there. Those games are 144K
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in size and are marked as 78S9 in the list.
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Some games have either 8K of RAM at $6000-$7fff or 16K of
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RAM at $4000-$7fff.
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Some games have a POKEY chip mapped in at this area. It
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has 16 addresses that get repeated all the way between $4000
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and $7fff.
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Some games only have 4 ROM banks at $8000-$bfff (0-3). Banks
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4-7 either return the same data as banks 0-3 or completely
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random data. PAL Karateka is a special case. It only uses
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banks 4-7. Banks 0-3 are random data and bank 6 is also fixed
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at $4000-$7fff.
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F18 Hornet has it's own bankswitching format (78AB). It has
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32K of fixed data at $8000-$ffff and 2 16K banks at $4000 -
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$7fff. The two banks get mapped in by writing either $01 or
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$02 to address $8000. I don't know if other addresses trigger
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the bankswitching too, but I'm assuming any address above
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$8000 might work. I have no idea what happens when you write
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other values to the hotspot, but they probably will just be
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ignored.
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Double Dragon and Rampage have a very wierd bankswitching
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scheme (78AC). It has 8 16K banks (0-7) that get mapped in at
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$a000-$dfff. Write accesses to addresses above $ff80 trigger
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the bankswitching. This sets the bank according to the low
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nibble of the address. So a write to $ff80 maps in bank 0,
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a write to $ff81 maps in bank 1, etc. The games only use
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addresses $ff80-$ff87, so I'm not sure if other addresses
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trigger the bankswitching too.
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If we are assuming that a bank reaches from $a000-$dfff,
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then the rest of the ROM space looks like this:
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$4000-$5fff second 8kb of bank 6
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$6000-$7fff first 8kb of bank 6
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$8000-$9fff second 8kb of bank 7
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$e000-$ffff first 8kb of bank 7
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Type RAM POKEY TV Name
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78SG 0 no NTSC Ace of Aces
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78S9 0 no NTSC Alien Brigade
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7816 0 no NTSC Asteroids
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7832 0 yes NTSC Ballblazer
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78SG 0 no NTSC Barnyard Blaster
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78SG 0 no NTSC Basketbrawl
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7816 0 no NTSC Centipede
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7832 0 no NTSC Choplifter!
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78SG 0 yes NTSC Commando
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7808 0 no NTSC Colour Test
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78SG 0 no NTSC Crack'ed
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78S9 0 no NTSC Crossbow
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78SG 0 no NTSC Dark Chambers
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7848 0 no NTSC Desert Falcon
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7816SG 144 no NTSC Development Cartridge (Atari)
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7832 0 no NTSC Diagnostic Cartridge
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7816 0 no NTSC Dig Dug
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7848 0 no NTSC Donkey Kong
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7848 0 no NTSC Donkey Kong Junior
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78AC 0 no NTSC Double Dragon
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78AB 0 no NTSC F18 Hornet
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78SG 0 no NTSC Fatal Run
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78SG 0 no NTSC Fight Night
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7832 0 no NTSC Food Fight
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7832 0 no NTSC Galaga
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7848 0 no NTSC Hatrick
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78HS 2 no NTSC High-Score Cartridge (RAM is battery backed)
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78SG 0 no NTSC Ikari Warriors
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78SG 8 no NTSC Impossible Mission
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78SG 8 no NTSC Jinks
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7832 0 no NTSC Joust
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7848 0 no NTSC Karateka
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78SG 0 no NTSC KLAX (prototype)
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7832 0 no NTSC Kung-Fu Master
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7848 0 no NTSC Mario Bros.
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78SG 0 no NTSC Mat Mania Challenge
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78SG 0 no NTSC Mean 18 Ultimate Golf
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78SG 0 no NTSC Meltdown
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78SG 0 no NTSC Midnight Mutants
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7816*2 8 no NTSC Monitor Cartridge (Harry Dodgson)
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(16KB for 7800 mode and 16KB for 2600 mode
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RAM is battery backed)
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78SG 0 no NTSC Motor Psycho
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7816 0 no NTSC Ms. Pac-Man
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78SG 0 no NTSC Ninja Golf
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7848 0 no NTSC One on One Basketball
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7832 0 no NTSC Pete Rose Baseball
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78S4 0 no NTSC Pitfighter (prototype)
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78SG 0 no NTSC Planet Smashers
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7832 0 no NTSC Pole Position II
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78AC 0 no NTSC Rampage
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78S4 0 no NTSC Realsports Baseball
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7832 0 no NTSC Robotron
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78SG 0 no NTSC Scrapyard Dog
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78SG 0 no NTSC Sentinel (prototype)
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78SG 16 no NTSC Summer Games
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7848 0 no NTSC Super Huey UH-IX
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7832 0 no NTSC Super Skateboardin'
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78S4 0 no NTSC Tank Command
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7832 0 no NTSC Titlematch Pro Wrestling
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7832 0 no NTSC Tomcat F14
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78SG 0 no NTSC Touchdown Football
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78S4 8 no NTSC Tower Toppler
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78S4 0 no NTSC Waterski
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78SG 16 no NTSC Winter Games
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78SG 0 no NTSC Xenophobe
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7832 0 no NTSC Xevious
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missing:
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GATO prototype
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Plutos prototype
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Sirius prototype
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Chuck Norris: Missing in Action prototype
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78SG 0 no PAL Ace of Aces
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78S9 0 no PAL Alien Brigade
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7816* 0 no PAL/NTSC Asteroids (BIOS)
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7832 0 yes PAL Ballblazer
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78SG 0 no PAL Barnyard Blaster
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78SG 0 no PAL Basketbrawl
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7816 0 no PAL Centipede
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7848 0 no PAL Choplifter!
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78SG 0 yes PAL Commando
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78SG 0 no PAL Crack'ed
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78S9 0 no PAL Crossbow
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78SG 0 no PAL Dark Chambers
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7848 0 no PAL Desert Falcon
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7832 0 no PAL Dig Dug
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7848 0 no PAL Donkey Kong
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7848 0 no PAL Donkey Kong Junior
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78AC 0 no PAL Double Dragon
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78AB 0 no PAL F18 Hornet
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78SG 0 no PAL Fatal Run
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78SG 0 no PAL Fight Night
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7848 0 no PAL Food Fight
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7848 0 no PAL Galaga
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7848 0 no PAL Hat Trick
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78SG 0 no PAL Ikari Warriors
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78SG 8 no PAL Impossible Mission
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78SG 8 no PAL Jinks
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7848 0 no PAL Joust
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78S4 0 no PAL Karateka (uses banks 4-7 instead of 0-3)
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7832 0 no PAL Kung-Fu Master
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7848 0 no PAL Mario Bros.
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78SG 0 no PAL Mat Mania Challenge
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78SG 0 no PAL Mean 18 Ultimate Golf
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78SG 0 no PAL Meltdown
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78SG 0 no PAL Midnight Mutants
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78SG 0 no PAL Motor Psycho
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7832 0 no PAL Ms. Pac-Man
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78SG 0 no PAL Ninja Golf
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7848 0 no PAL One on One Basketball
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7832 0 no PAL (Pete Rose) Baseball
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78SG 0 no PAL Planet Smashers
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7832 0 no PAL Pole Position II
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78SG 0 no PAL Scrapyard Dog
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78SG 0 no PAL Sentinel
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7848 0 no PAL Super Huey UH-IX
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7832 0 no PAL Super Skateboardin'
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7832 0 no PAL Titlematch Pro Wrestling
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7832 0 no PAL Tomcat F14
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78S4 8 no PAL Tower Toppler
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78SG 0 no PAL Xenophobe
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7848 0 no PAL Xevious
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no PAL version released (?):
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Rampage
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Realsports Baseball
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Robotron
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Summer Games
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Tank Command
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Touchdown Football
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Water Ski
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Winter Games
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