PowerPak Menu: Difference between revisions
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* '''A.MAP''' (<u>A</u>uto) - checks a "saves" directory for a save with the same name as the ROM being loaded | * '''A.MAP''' (<u>A</u>uto) - checks a "saves" directory for a save with the same name as the ROM being loaded | ||
* '''B.MAP''' (<u>B</u>attery) - save selection screen | * '''B.MAP''' (<u>B</u>attery) - save selection screen | ||
* '''D.MAP''' (<u>D</u>isk | * '''D.MAP''' (<u>D</u>isk) - [[FDS]] save selection screen | ||
* '''E.MAP''' (<u>E</u>rror) - displays "Bad File Header" | * '''E.MAP''' (<u>E</u>rror) - displays "Bad File Header" | ||
* '''F.MAP''' (<u>F</u>DS) - attempts to load an "FDSBIOS.BIN" from the PowerPak directory into WRAM, then starts an FDS game | * '''F.MAP''' (<u>F</u>DS) - attempts to load an "FDSBIOS.BIN" from the PowerPak directory into WRAM, then starts an FDS game | ||
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* '''L.MAP''' (<u>L</u>ast) - saves the game name to LASTNES.TXT in the PowerPak directory, also loads appropriate iNES mapper file based on header | * '''L.MAP''' (<u>L</u>ast) - saves the game name to LASTNES.TXT in the PowerPak directory, also loads appropriate iNES mapper file based on header | ||
* '''M.MAP''' (<u>M</u>usic) - loads an NSF and the NSF player, and starts the NSF | * '''M.MAP''' (<u>M</u>usic) - loads an NSF and the NSF player, and starts the NSF | ||
* '''N.MAP''' (<u>N</u>) - ROM selection screen | * '''N.MAP''' (<u>N</u>avigate) - ROM selection screen | ||
* '''O.MAP''' (<u>O</u>ptions) - game options screen, with Game Genie code entering and save loading | * '''O.MAP''' (<u>O</u>ptions) - game options screen, with Game Genie code entering and save loading | ||
* '''Q.MAP''' (<u>Q</u>uestion) - "save to CF card?" screen | * '''Q.MAP''' (<u>Q</u>uestion) - "save to CF card?" screen | ||
Latest revision as of 11:21, 28 November 2022
The PowerPak boot ROM and menu system use its own simple mapper. The PowerPak menu is split into a series of modules that reside at $0400-$07FF in the NES's built-in RAM and are loaded from the CF card. After booting, the module "I.MAP" is loaded and run.
See also: PowerPak development resources
Modules
Modules are switched between by writing the filename to fileEntry (usually a single character, calling ClearFindEntry beforehand if it's not already cleared), then calling CardLoadModule. Source for all modules is located here.
- A.MAP (Auto) - checks a "saves" directory for a save with the same name as the ROM being loaded
- B.MAP (Battery) - save selection screen
- D.MAP (Disk) - FDS save selection screen
- E.MAP (Error) - displays "Bad File Header"
- F.MAP (FDS) - attempts to load an "FDSBIOS.BIN" from the PowerPak directory into WRAM, then starts an FDS game
- G.MAP (Game Genie) - Game Genie .txt file selection screen
- I.MAP (Init) - title screen
- L.MAP (Last) - saves the game name to LASTNES.TXT in the PowerPak directory, also loads appropriate iNES mapper file based on header
- M.MAP (Music) - loads an NSF and the NSF player, and starts the NSF
- N.MAP (Navigate) - ROM selection screen
- O.MAP (Options) - game options screen, with Game Genie code entering and save loading
- Q.MAP (Question) - "save to CF card?" screen
- S.MAP (Save) - writes a save to the CF card
Banks
- PPU $0000-$1FFF: 8 KB switchable CHR RAM bank.
- CPU $6000-$7FFF: 8 KB switchable PRG RAM bank, selects from the 512 KB "PRG ROM" space.
- CPU $8000-$BFFF: 16 KB switchable PRG ROM bank, selects from boot ROM.
- CPU $C000-$FFFF: 16 KB PRG ROM bank, fixed to the last bank of boot ROM.
Registers
FPGADATA ($5000)
The boot ROM writes $FF to this register. It tells the FPGA it is being reprogrammed.
FPGAPROGRAM ($5800)
7 bit 0 ---- ---- DDDD DDDD |||| |||| ++++-++++- Writes a byte of configuration to the FPGA.
MAPPERWR ($8000)
7 bit 0
---- ----
.... ..DD
||
++- Selects the bank of boot ROM that appears at $8000-$BFFF.
Banks 0, 1 and 2 contain the initial FPGA configuration. Bank 3 contains 8KB of font and then 8KB of system routines. As the last 16KB are also accessible via the fixed bank, the $8000-$BFFF area isn't useful for menu software.
PRGBANK ($4200)
7 bit 0 ---- ---- WCDD DDDD |||| |||| ||++-++++- Selects the bank of PRG RAM that appears in $6000-$7FFF. |+-------- Enable CHR RAM writing if 1. +--------- Selects from 32KB of WRAM instead of main PRG RAM.
CHRBANK ($4201)
7 bit 0 ---- ---- ..DD DDDD || |||| ++-++++- Selects the bank of CHR RAM used.
External Links
- Collection of information and photos, source code for menu and loader: http://nespowerpak.com/
