mirror of https://github.com/g012/l65.git
[NES] Added MMC3 mapper.
This commit is contained in:
g012
parent
99deb2b875
commit
d740492e8f
10
README.md
10
README.md
|
|
@ -47,7 +47,7 @@ Table of Contents
|
|||
* [resolve()](#resolve)
|
||||
* [genbin([filler])](#genbinfiller)
|
||||
* [writebin(filename)](#writebinfilename)
|
||||
* [writesym(filename)](#writesymfilename)
|
||||
* [writesym(filename [, format])](#writesymfilename--format)
|
||||
* [Parser Functions](#parser-functions)
|
||||
* [Pragmas](#pragmas)
|
||||
* [syntax6502 on|off](#syntax6502-onoff)
|
||||
|
|
@ -466,9 +466,13 @@ Return a table, where each entry is a byte.
|
|||
|
||||
Write the final binary into `filename`.
|
||||
|
||||
#### writesym(filename)
|
||||
#### writesym(filename [, format])
|
||||
|
||||
Write a DASM symbol file into `filename` for debuggers. The last `_` in a label is turned into a `.`, to get stripping of the prefixed global label working in Stella. As such, it's best to avoid using `_` in local label names, after the initial one.
|
||||
Write one or more symbol files into `filename` (prefix in case of multiple outputs) for debuggers. The last `_` in a label is turned into a `.`, to get stripping of the prefixed global label working in Stella. As such, it's best to avoid using `_` in local label names, after the initial one.
|
||||
|
||||
`format` defaults to 'dasm'.
|
||||
All platforms: 'dasm', 'lua'.
|
||||
NES: 'mesen', 'fceux'.
|
||||
|
||||
### Parser Functions
|
||||
|
||||
|
|
|
|||
127
nes.l65
127
nes.l65
|
|
@ -62,10 +62,11 @@ end
|
|||
cpu.getsym_as.mesen = function() -- .mlb
|
||||
local ins,fmt = table.insert,string.format
|
||||
local s = getsym(function(a,l)
|
||||
if a >= 0x10000 then return end
|
||||
local prefix = {}
|
||||
if a < 0x2000 then prefix[1]='R'
|
||||
elseif a >= 0x6000 and a < 0x8000 then prefix[1]='S' prefix[2]='W' a=a-0x6000
|
||||
elseif a >= 0x8000 and a < 0x10000 then prefix[1]='P' a=a-0x8000
|
||||
elseif a >= 0x8000 then prefix[1]='P' a=a-0x8000
|
||||
else prefix[1]='G' end
|
||||
local s = {}
|
||||
for _,p in ipairs(prefix) do ins(s, fmt("%s:%04x:%s", p, a, l)) end
|
||||
|
|
@ -79,7 +80,7 @@ cpu.getsym_as.fceux = function(filename) -- .nl, multiple files
|
|||
local s = getsym(function(a,l)
|
||||
local s = fmt("$%04x#%s#", a, l)
|
||||
if a < 0x8000 then ins(ram, s)
|
||||
else
|
||||
elseif a < 0x10000 then
|
||||
local a_org = symbolsorg[l] or a
|
||||
local bank = math.floor((a_org - 0x8000) / 0x4000)
|
||||
if not rom[bank] then rom[bank] = {} end
|
||||
|
|
@ -98,11 +99,13 @@ cpu.getsym_as.fceux = function(filename) -- .nl, multiple files
|
|||
end
|
||||
end
|
||||
|
||||
mappers = {}
|
||||
|
||||
vblank_waitbegin = function()
|
||||
local l=label() lda PPUSTAT bpl l
|
||||
local l=label() bit PPUSTAT bpl l
|
||||
end
|
||||
vblank_waitend = function()
|
||||
local l=label() lda PPUSTAT bmi l
|
||||
local l=label() bit PPUSTAT bmi l
|
||||
end
|
||||
|
||||
ppu_addr = function(addr)
|
||||
|
|
@ -180,12 +183,12 @@ read_joys_even = function(dst1, dst2)
|
|||
end
|
||||
|
||||
init = function()
|
||||
sei cld
|
||||
ldx #0x40 stx SPECIO2
|
||||
ldx #0xff txs inx stx PPUCTRL stx PPUMASK stx DMCFREQ
|
||||
sei -- cld not needed, no BCD support
|
||||
ldx #0x40 stx SPECIO2 -- disable APU frame IRQ
|
||||
ldx #0xff txs inx stx PPUCTRL stx PPUMASK stx DMCFREQ -- disable NMI, rendering, DMC IRQs
|
||||
bit PPUSTAT -- clear remnant VBlank PPU status flag on reset
|
||||
vblank_waitbegin()
|
||||
-- stop APU channels
|
||||
lda #0 sta SNDCNT
|
||||
lda #0 sta SNDCNT -- stop APU channels
|
||||
-- clear CPU RAM
|
||||
@_zeroram
|
||||
sta 0x0000,x sta 0x0100,x sta 0x0200,x sta 0x0300,x
|
||||
|
|
@ -195,11 +198,11 @@ init = function()
|
|||
-- clear OAM
|
||||
oamcache_clear() oamcache_flush()
|
||||
-- clear PPU RAM
|
||||
lda PPUSTAT ppu_addr(0x2000) tax ldy #0x10
|
||||
bit PPUSTAT ppu_addr(0x2000) tax ldy #0x10
|
||||
@_zeroppu
|
||||
sta PPUDATA dex bne _zeroppu dey bne _zeroppu
|
||||
-- reset latch
|
||||
lda PPUSTAT
|
||||
bit PPUSTAT -- reset latch
|
||||
if mappers.init then mappers.init() end
|
||||
end
|
||||
|
||||
-- NES 2.0 (backward compatible with iNES)
|
||||
|
|
@ -259,25 +262,24 @@ header = function(t)
|
|||
dc.b tv, 0, 0, 0
|
||||
|
||||
-- update table with defaulted values
|
||||
t.prgsize = prgsize
|
||||
t.chrsize = chrsize
|
||||
t.wramsize = wramsize
|
||||
t.bramsize = bramsize
|
||||
t.chrbramsize = chrbramsize
|
||||
t.chrramsize = chrramsize
|
||||
t.prgsize = prgsize * 16384
|
||||
t.chrsize = chrsize * 8192
|
||||
t.wramsize = math.tointeger(2^wramsize*64)
|
||||
t.bramsize = math.tointeger(2^bramsize*64)
|
||||
t.chrbramsize = math.tointeger(2^chrbramsize*64)
|
||||
t.chrramsize = math.tointeger(2^chrramsize*64)
|
||||
mappers.header=t
|
||||
end
|
||||
|
||||
mappers = {}
|
||||
|
||||
local n0ne = function(x) return not x or x == 0 end
|
||||
local val0 = function(x) return x and x or 0 end
|
||||
|
||||
mappers.NROM = function(t)
|
||||
if not t then t = {} end
|
||||
if not t.prgsize then t.prgsize = 16384 end
|
||||
assert(t.prgsize == 16384 or t.prgsize == 32768, "prgrom must be 16 or 32kB")
|
||||
assert(t.prgsize == 16384 or t.prgsize == 32768, "prgsize must be 16 or 32kB")
|
||||
if n0ne(t.chrsize) and n0ne(t.chrramsize) and n0ne(t.chrbramsize) then t.chrsize = 8192 end
|
||||
assert(val0(t.chrsize) + val0(t.chrramsize) + val0(t.chrbramsize) == 8192, "chrrom/ram must be 8kB")
|
||||
assert(val0(t.chrsize) + val0(t.chrramsize) + val0(t.chrbramsize) == 8192, "combined chrrom size must be 8kB")
|
||||
assert(not t.mirror or ({ h=1, v=1 })[t.mirror:lower()], "only H and V mirroring are supported")
|
||||
local prgstart = 0x10000 - t.prgsize
|
||||
hdrrom = location{prgstart - 16, prgstart - 1, name='header'}
|
||||
|
|
@ -292,6 +294,87 @@ mappers.MMC1 = function(t)
|
|||
end
|
||||
mappers[1] = mappers.MMC1
|
||||
|
||||
--[[
|
||||
prgroms are numbered from last (0) to first (#-1), so that adding more does not change
|
||||
prgrom0, which must contain the reset vector (main).
|
||||
Last 2 prg banks are merged into 1 16kB bank, to allow linker optimization - hence, 0 must
|
||||
always be set on bit 6 of bank select, even; also, there is no prgrom1 as a consequence.
|
||||
t.prgmap is an optional function taking a prgrom bank index and returning its rorg value.
|
||||
Default is to map even banks to 0x8000, and odd to 0xa000.
|
||||
|
||||
chrroms are all 1kB, so they can work with chr A12 inversion enabled or not.
|
||||
|
||||
With default submapper id of 0, this defaults to revision MM3C, which generates a scanline
|
||||
interrupt at each scanline when counter is loaded with 0.
|
||||
]]
|
||||
mappers.MMC3 = function(t)
|
||||
if not t then t = {} end
|
||||
t.mapperid = 4
|
||||
if not t.bramsize then t.bramsize = 8192 end
|
||||
assert(t.bramsize == 8192, "bramsize must be 8kB")
|
||||
if not t.prgsize then t.prgsize = 32768 end
|
||||
assert(t.prgsize >= 0x8000 and t.prgsize <= 0x80000, "prgsize must be at least 32kB and at most 512kB")
|
||||
if not t.chrsize then t.chrsize = 8192 end
|
||||
assert(t.chrsize >= 0x2000 and t.chrsize <= 0x40000, "chrsize must be at least 8kB and at most 256kB")
|
||||
hdrrom = location{0x7FF0, 0x7FFF, name='header'}
|
||||
header(t)
|
||||
local prgmap = t.prgmap or function(bi, bc) return 0x8000+(bi&1)*0x2000 end
|
||||
local bc = t.prgsize//0x2000
|
||||
for bi=0,bc-3 do
|
||||
local o,ix = 0x8000 + bi*0x2000, bc-bi-1
|
||||
_ENV['prgrom'..ix] = location{o, o+0x1fff, rorg=prgmap(ix,bc), name='prgrom'..ix}
|
||||
end
|
||||
do
|
||||
local o = 0x8000 + (bc-2)*0x2000
|
||||
prgrom0 = location{o, o+0x3fff, rorg=0xc000, name='prgrom0'}
|
||||
section{"vectors", org=o+0x3ffa} dc.w nmi, main, irq
|
||||
end
|
||||
local chrstart = 0x8000 + bc*0x2000
|
||||
local cc = t.chrsize//0x400
|
||||
for ci=0,cc-1 do
|
||||
local o = chrstart + ci*0x400
|
||||
_ENV['chrrom'..ci] = location{o, o+0x3ff, name='chrrom'..ci}
|
||||
end
|
||||
function switchprgrom(slot, bankix)
|
||||
assert(slot<2)
|
||||
lda #6+slot sta 0x8000
|
||||
assert(bankix < bc)
|
||||
bankix = bc-1-bankix -- reverse index order, since we set 0 as last
|
||||
lda #bankix sta 0x8001
|
||||
end
|
||||
local a12inv = false
|
||||
function seta12inv(enabled) a12inv = enabled end
|
||||
-- slot [0, 7], each slot is 1kB counting in order, regardless of a12inv state
|
||||
function switchchrrom(slot, bankix)
|
||||
assert(slot<8)
|
||||
if a12inv then
|
||||
assert(slot ~= 5 and slot ~= 7)
|
||||
if slot == 6 then slot = 1
|
||||
elseif slot == 4 then slot = 0
|
||||
else slot = slot + 2 end
|
||||
slot = slot | 0x80
|
||||
else
|
||||
assert(slot ~= 1 and slot ~= 3)
|
||||
if slot == 2 then slot = 1
|
||||
elseif slot > 3 then slot = slot - 2 end
|
||||
end
|
||||
lda #slot sta 0x8000
|
||||
assert(bankix < cc)
|
||||
lda #bankix sta 0x8001
|
||||
end
|
||||
function setmirror(mirror)
|
||||
mirror = assert(({ h=1, v=0 })[mirror:lower()])
|
||||
lda #mirror sta 0xa000
|
||||
end
|
||||
function protectsram() lda 0x40 sta 0xa001 end
|
||||
function scanlineirq(count) ldx #1 stx 0xe000 lda #count-1 sta 0xc000 sta 0xc001 stx 0xe001 end
|
||||
mappers.init = function()
|
||||
switchprgrom(0, 2) switchprgrom(1, 3)
|
||||
switchchrrom(0, 0) switchchrrom(2, 2)
|
||||
switchchrrom(4, 4) switchchrrom(5, 5) switchchrrom(6, 6) switchchrrom(7, 7)
|
||||
local mirror = mappers.header.mirror
|
||||
if mirror==0 or mirror==1 then lda #mirror~1 sta 0xa000 end
|
||||
lda #0x80 sta 0xa001
|
||||
end
|
||||
end
|
||||
mappers[4] = mappers.MMC3
|
||||
|
|
|
|||
Loading…
Reference in New Issue