4cade/src/constants.a

;license:MIT
;(c) 2018-2021 by 4am
;

;------------------------------------------------------------------------------
; YE OLDE GRAND UNIFIED MEMORY MAP
;
; LC RAM BANK 1
; D000..DFDE - persistent data structures (gGlobalPrefsStore, gGamesListStore)
; ...unused...
; E000..E3FF - HGR font data
; ...unused...
; E978..FFEE - main program code
; FFEF..FFF9 - API functions and global constants available for main program
;              code, prelaunchers, transition effects, &c.
;              (LoadFileDirect, Wait/UnwaitForVBL, MockingboardStuff, MachineStatus)
; FFFA..FFFF - NMI, reset, IRQ vectors
;
; LC RAM BANK 2
; D000..D3FF - ProRWTS data
; D400..D6C3 - ProRWTS code
; D6C4..DAB8 - ProRWTS glue code
; DAB9..DABF - backup of stack (during gameplay and self-running demos)
; ...unused...
; DBB4..DBFF - (de)acceleration function
; DC00..DFFF - unused
;------------------------------------------------------------------------------

!ifndef _CONSTANTS_ {

; soft switches
KBD =          $C000      ; last key pressed (if any)
CLEARKBD =     $C010      ; clear last key pressed
STOREOFF =     $C000      ; STA then use the following 4 flags:
READMAINMEM =  $C002      ; STA to read from main mem
READAUXMEM =   $C003      ; STA to read from aux mem
WRITEMAINMEM = $C004      ; STA to write to main mem
WRITEAUXMEM =  $C005      ; STA to write to aux mem
CLRC3ROM =     $C00A      ; STA to use internal Slot 3 ROM (required to use 128K and DHGR)
SETC3ROM =     $C00B      ; STA to use external Slot 3 ROM (required to detect VidHD in slot 3)
CLR80VID =     $C00C      ; 40 columns (also used to get out of DHGR mode)
SET80VID =     $C00D      ; 80 columns (also used to get into DHGR mode)
PRIMARYCHARSET= $C00E     ; no mousetext for you
SLOT3STATUS =  $C017      ; bit 7 only
TBCOLOR =      $C022      ; IIgs text foreground and background colors (also VidHD)
NEWVIDEO =     $C029      ; IIgs graphics modes (also VidHD)
SPEAKER =      $C030      ; chirp chirp
CLOCKCTL =     $C034      ; bits 0-3 are IIgs border color (also VidHD)
SHADOW =       $C035      ; IIgs auxmem-to-bank-E1 shadowing (also VidHD)
TEXTMODE =     $C051
PAGE1 =        $C054      ; page 1 (affects text, HGR, DHGR)
PAGE2 =        $C055      ; page 2 (affects text, HGR, DHGR)
DHIRESON =     $C05E      ; double hi-res on switch
DHIRESOFF =    $C05F      ; double hi-res off switch

; ROM routines and addresses
; (prefixed because so much of the program runs from LC RAM, so don't call
; these without thinking about memory banks first)
ROM_TEXT2COPY =$F962      ; turn on alternate display mode on IIgs
ROM_REBOOT =   $FAA6
ROM_TEXT =     $FB2F
ROM_MACHINEID =$FBB3
ROM_HOME =     $FC58
ROM_COUT =     $FDED
ROM_NORMAL =   $FE84      ; NORMAL text (instead of INVERSE or FLASH)
ROM_IN0 =      $FE89      ; SETKBD
ROM_PR0 =      $FE93      ; SETVID

; zero page during init ONLY
zpMachineStatus= $F0      ; bit 7 = 1 if machine has joystick
                          ; bit 6 = 1 if machine has 128K
                          ; bit 5 = 1 if machine has a VidHD card
                          ; bit 4 = 1 if machine is a IIgs
                          ; only used during init, then copied to MachineStatus in LC RAM
zpCharMask   = $F1        ; only used during init, then clobbered

; zero page
PARAM        = $00        ; word (used by PARAMS_ON_STACK macro, so basically everywhere)
PTR          = $02        ; word
SRC          = $04        ; word
DEST         = $06        ; word
SAVE         = $08        ; word
WINDEX       = $0A        ; word
WCOUNT       = $0C        ; word
HTAB         = $24        ; byte
VTAB         = $25        ; byte
RNDSEED      = $4E        ; word
; textrank
BestMatchIndex = $E5      ; word
tmpx         = $E7        ; byte
remainder    = $E8        ; word
num1         = $EA        ; word
num2         = $EC        ; byte
Timeout      = $ED        ; 3 bytes (used by SearchMode)
zpword   =     $F0        ; word
zpstring =     $F2        ; word
runningscore=  $F4        ; word
startat  =     $F6        ; byte
i        =     $F7        ; byte
tmp      =     $F8        ; byte
gamelength=    $F9        ; byte
firstletter=   $FA        ; byte
MatchCount =   $FB        ; byte
BestMatchScore = $FC      ; byte

;              $FE        ; used by ParseGamesList
;              $FF        ; used by ParseGamesList

; main memory
gStackSize   = 6          ; seems like only six are needed
gPathname    = $BFD0      ; used by SetPath/AddToPath
gKeyLen      = $1F00      ; used by ParseGamesList
gKey         = $1F01
UILine1      = $1FB0
UILine2      = $1FD8
UI_ToPlay    = $1FF7

gValLen      = $1F80
gVal         = $1F81

; LC RAM 1
iLoadFileDirect    = $FFEF
WaitForVBL         = $FFF2
UnwaitForVBL       = $FFF5

MockingboardStuff  = $FFF8  ; bit 7 = 1 if speech chip present (Mockingboard "C")
                            ; bit 6 = 1 if Mockingboard "B" (stereo) found (else Mockingboard "A")
                            ; bit 4-5 unused
                            ; bits 0-3: slot number
MachineStatus      = $FFF9

; LC RAM 2
DisableAccelerator = $DBB4
EnableAccelerator  = DisableAccelerator+3

; AND masks for MockingboardStuff
MOCKINGBOARD_SLOT = %00001111
HAS_SPEECH        = %10000000

; AND masks for game info bitfield (after game display name in gGamesListStore)
HAS_DHGR_TITLE    = %10000000        ; this one is hard-coded via BMI instead of AND/BNE
CHEAT_CATEGORY    = %00001111

; AND masks for MachineStatus
HAS_JOYSTICK   = %10000000
HAS_128K       = %01000000
IS_IIGS        = %00100000           ; /!\ do not use this to gate SHR, use SUPPORTS_SHR instead
HAS_VIDHD      = %00010000
SUPPORTS_SHR   = %00110000
CHEATS_ENABLED = %00001000

; shared symbols for prelaunch and effects to call ProRWTS2 functions
iCurBlockLo    = $D401               ; constant
iCurBlockHi    = $D403               ; constant
launchpatch    = $D662               ; glue.launch.a
iAddToPath     = $FE8F               ; Roger Rabbit, avoid, use Infiltrator 2 style instead
itraverse      = $D959               ; Roger Rabbit, avoid, use Infiltrator 2 style instead
ldrlo          = $55                 ; constant
ldrhi          = $56                 ; constant
namlo          = $57                 ; constant
namhi          = $58                 ; constant
ldrlo2         = $64                 ; constant
ldrhi2         = $65                 ; constant

_CONSTANTS_=*
}