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l65/vcs.l65

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-- set cpu to 6502
cpu = require "6502"
setmetatable(_ENV, cpu)
vcs = {
-- TIA write only
VSYNC = 0x00, -- ......1. vertical sync set-clear
VBLANK = 0x01, -- 11....1. vertical blank set-clear
WSYNC = 0x02, -- <strobe> wait for leading edge of horizontal blank
RSYNC = 0x03, -- <strobe> reset horizontal sync counter
NUSIZ0 = 0x04, -- ..111111 number-size player-missile 0
NUSIZ1 = 0x05, -- ..111111 number-size player-missile 1
COLUP0 = 0x06, -- 1111111. color-lum player 0 and missile 0
COLUP1 = 0x07, -- 1111111. color-lum player 1 and missile 1
COLUPF = 0x08, -- 1111111. color-lum playfield and ball
COLUBK = 0x09, -- 1111111. color-lum background
CTRLPF = 0x0a, -- ..11.111 control playfield ball size & collisions
REFP0 = 0x0b, -- ....1... reflect player 0
REFP1 = 0x0c, -- ....1... reflect player 1
PF0 = 0x0d, -- 1111.... playfield register byte 0
PF1 = 0x0e, -- 11111111 playfield register byte 1
PF2 = 0x0f, -- 11111111 playfield register byte 2
RESP0 = 0x10, -- <strobe> reset player 0
RESP1 = 0x11, -- <strobe> reset player 1
RESM0 = 0x12, -- <strobe> reset missile 0
RESM1 = 0x13, -- <strobe> reset missile 1
RESBL = 0x14, -- <strobe> reset ball
AUDC0 = 0x15, -- ....1111 audio control 0
AUDC1 = 0x16, -- ....1111 audio control 1
AUDF0 = 0x17, -- ...11111 audio frequency 0
AUDF1 = 0x18, -- ...11111 audio frequency 1
AUDV0 = 0x19, -- ....1111 audio volume 0
AUDV1 = 0x1a, -- ....1111 audio volume 1
GRP0 = 0x1b, -- 11111111 graphics player 0
GRP1 = 0x1c, -- 11111111 graphics player 1
ENAM0 = 0x1d, -- ......1. graphics (enable) missile 0
ENAM1 = 0x1e, -- ......1. graphics (enable) missile 1
ENABL = 0x1f, -- ......1. graphics (enable) ball
HMP0 = 0x20, -- 1111.... horizontal motion player 0
HMP1 = 0x21, -- 1111.... horizontal motion player 1
HMM0 = 0x22, -- 1111.... horizontal motion missile 0
HMM1 = 0x23, -- 1111.... horizontal motion missile 1
HMBL = 0x24, -- 1111.... horizontal motion ball
VDELP0 = 0x25, -- .......1 vertical delay player 0
VDELP1 = 0x26, -- .......1 vertical delay player 1
VDELBL = 0x27, -- .......1 vertical delay ball
RESMP0 = 0x28, -- ......1. reset missile 0 to player 0
RESMP1 = 0x29, -- ......1. reset missile 1 to player 1
HMOVE = 0x2a, -- <strobe> apply horizontal motion
HMCLR = 0x2b, -- <strobe> clear horizontal motion registers
CXCLR = 0x2c, -- <strobe> clear collision latches= 0x20
-- TIA read only
CXM0P = 0x30, -- 11...... read collision M0-P1, M0-P0 (Bit 7 --6)
CXM1P = 0x31, -- 11...... read collision M1-P0, M1-P1
CXP0FB = 0x32, -- 11...... read collision P0-PF, P0-BL
CXP1FB = 0x33, -- 11...... read collision P1-PF, P1-BL
CXM0FB = 0x34, -- 11...... read collision M0-PF, M0-BL
CXM1FB = 0x35, -- 11...... read collision M1-PF, M1-BL
CXBLPF = 0x36, -- 1....... read collision BL-PF, unused
CXPPMM = 0x37, -- 11...... read collision P0-P1, M0-M1
INPT0 = 0x38, -- 1....... read pot port
INPT1 = 0x39, -- 1....... read pot port
INPT2 = 0x3a, -- 1....... read pot port
INPT3 = 0x3b, -- 1....... read pot port
INPT4 = 0x3c, -- 1....... read input
INPT5 = 0x3d, -- 1....... read input
-- PIA
SWCHA = 0x280, -- 11111111 Port A= 0x280 -- input or output (read or write)
SWACNT = 0x281, -- 11111111 Port A DDR, 0= input, 1=output
SWCHB = 0x282, -- 11111111 Port B= 0x280 -- console switches (read only)
SWBCNT = 0x283, -- 11111111 Port B DDR (hardwired as input)
INTIM = 0x284, -- 11111111 Timer output (read only)
INSTAT = 0x285, -- 11...... Timer Status (read only, undocumented)
TIM1T = 0x294, -- 11111111 set 1 clock interval (838 nsec/interval)
TIM8T = 0x295, -- 11111111 set 8 clock interval (6.7 usec/interval)
TIM64T = 0x296, -- 11111111 set 64 clock interval (53.6 usec/interval)
T1024T = 0x297, -- 11111111 set 1024 clock interval (858.2 usec/interval)
}
do
local symbols = cpu.symbols
for k,v in pairs(vcs) do symbols[k] = v end
end
mappers = {}
mappers['2K'] = function()
rom0 = location(0xf800, 0xffff)
section{"vectors", org=0xfffc} word(main,main)
end
mappers.CV = mappers['2K']
mappers['4K'] = function()
rom0 = location(0xf000, 0xffff)
section{"vectors", org=0xfffc} word(main,main)
end
local bank_stubs = function(count, hotspot, entry)
function switchrom(i) assert(i>=0 and i<count) bit 0x1000+hotspot+i end
local base = 0x10000 - (count << 12)
for bi=0,count-1 do
local o = base+(bi<<12)
_ENV['rom' .. bi] = location{o, o+0xfff, rorg=0xf000}
local start=section{"entry"..bi, org=o+(entry or hotspot-6)} switchrom(0) if bi==0 then jmp main end
section{"switchtab"..bi, org=o+hotspot} for i=1,count do byte(0) end
section{"vectors"..bi, org=o+0xffc} word(start,start)
end
end
mappers.FA = function() bank_stubs(3, 0xff8) end
mappers.F8 = function() bank_stubs(2, 0xff8) end
mappers.F6 = function() bank_stubs(4, 0xff6) end
mappers.F4 = function() bank_stubs(8, 0xff4) end
mappers.EF = function() bank_stubs(16, 0xfe0, 0xffc-6) end
mappers.FE = function()
rom0 = location(0xd000, 0xdfff)
section{"vectors0", org=0xdffc} word(main,main)
location{0xe000, 0xefff, nofill=true}
rom1 = location(0xf000, 0xffff)
section{"vectors1", org=0xfffc} word(main,main)
end
mappers.E0 = function(map)
function switchrom0(i) assert(map[i]==0) bit 0x1fe0+i end
function switchrom1(i) assert(map[i]==1) bit 0x1fe8+i end
function switchrom2(i) assert(map[i]==2) bit 0x1ff0+i end
map[7]=3
for bi=0,7 do
local o = bi*0x400
_ENV["rom"..bi] = location{0xe000+o, 0xe3ff+o, rorg=0xf000+map[bi]*0x400}
end
section{"switchtab", org=0xffe0} for i=1,8*3 do byte(0) end
section{"vectors", org=0xfffc} word(main,main)
end
-- rom0 refers to the last one in ROM, ie the one always mapped to 0xF800-0xFFFF,
-- such that changing the rom count does not change its index
mappers['3F'] = function(count)
function switchrom(i) assert(i>=0 and i<count-1) lda#i sta 0x3f end
local symbols=cpu.symbols for k,v in pairs(vcs) do -- remap TIA to 0x40-0x7F
if v<0x40 then v=v+0x40 vcs[k]=v symbols[k]=v end
end
bi=0,count-2 do
local o = 0x800*bi + 0x10000
_ENV["rom"..(count-1-bi)] = location{o, 0x7ff+o, rorg=0xf000}
end
local o = 0x800 * (count-1) + 0x10000
rom0 = location{o, 0x7ff+o, rorg=0xf800}
section{"vectors", org=0xfffc} word(main,main)
end
mappers.E7 = function()
function switchrom(i) assert(i>=0 and i<7) bit 0x1fe0+i end
function enableram() bit 0x1fe7 end
function switchram(i) assert(i>=0 and i<4) bit 0x1fe8+i end
for bi=0,6 do
local o = bi*0x800
_ENV['rom' .. bi] = location{o+0xc000, o+0xc7ff, rorg=0xf000}
end
rom7 = location{0xf800, 0xffff, rorg=0xf800}
section{"switchtab", org=0xffe0} for i=1,12 do byte(0) end
section{"vectors", org=0xfffc} word(main,main)
end
mappers.F0 = function()
function switchrom() lda 0x1ff0 end
for bi=0,15 do
local o = bi*0x1000 + 0x1000
_ENV['rom' .. bi] = location{o, o+0xfff, rorg=0xf000}
local start=section{"entry"..bi, org=o+0xffc-8}
@_loop switchrom() bne _loop
if bi==0 then jmp main end
section{"switchtab"..bi, org=o+0xff0} byte(bi)
section{"vectors"..bi, org=o+0xffc} word(start,start)
end
end
local bank_stubs2 = function(hotspot0, hotspot1)
function switchrom(i)
if i==0 then bit hotspot0
elseif i==1 then bit hotspot1
else error("invalid rom index: " .. i) end
end
local base = 0xe000
for bi=0,1 do
local o = base+(bi<<12)
_ENV['rom' .. bi] = location{o, o+0xfff, rorg=0xf000}
local start=section{"entry"..bi, org=o+0xffc-6} switchrom(0) if bi==0 then jmp main end
section{"vectors"..bi, org=o+0xffc} word(start,start)
end
end
mappers.UA = function() bank_stubs2(0x220, 0x240) end
mappers['0840'] = function() bank_stubs2(0x800, 0x840) end
mappers.SB = function(count)
function switchrom(i) assert(i>=0 and i<count) bit 0x800+i end
for bi=0,count-1 do
local o = bi*0x1000 + 0x1000
_ENV['rom' .. bi] = location{o, o+0xfff, rorg=0xf000}
local start=section{"entry"..bi, org=o+0xffc-6} switchrom(0) if bi==0 then jmp main end
section{"vectors"..bi, org=o+0xffc} word(start,start)
end
end
mappers['3E'] = function(rom_count, ram_count)
mappers['3F'](rom_count)
function switchram(i) assert(i>=0 and i<ram_count-1) lda#i sta 0x3E end
end
-- rom0 refers to the last 1k in ROM, which is mapped automatically on reset,
-- such that changing the rom count does not change its index
mappers.MC = function(rom_count, ram_count)
for i=0,3 do
_ENV['switchrom'..i] = function(i) assert(i>=0 and i<128) lda#i sta 0x3c+i end
_ENV['switchram'..i] = function(i) assert(i>=0 and i<128) lda#i+0x80 sta 0x3c+i end
end
for bi=0,rom_count-1 do
local o = bi*0x400 + 0x1000
_ENV["rom"..(count-1-bi)] = location{o, 0x3ff+o, rorg=0xf000+(o&0xfff)}
end
local start=section("entry") switchrom3(0) jmp main
section{"vectors", org=0xfffc} word(start,start)
end
mappers.X07 = function()
function switchrom(i) assert(i>=0 and i<16) bit 0x80b+(i<<4) end
-- map TIA also to 0x40-0x7F: use VSYNC for bank 14, and VSYNC2 for bank 15
vcs.VSYNC2=0x40 cpu.symbols.VSYNC2=0x40
for bi=0,count-1 do
local o = bi*0x1000 + 0x1000
_ENV['rom' .. bi] = location{o, o+0xfff, rorg=0xf000}
local start=section{"entry"..bi, org=o+0xffc-6} switchrom(0) if bi==0 then jmp main end
section{"vectors"..bi, org=o+0xffc} word(start,start)
end
end
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