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|
{+-----------------------------------------------------------------------------+
| Description: Memory functions
| last changes: 15.12.2000
|
| http://www.tu-ilmenau.de/~hackbart
+----------------------------------------------------------------------------+}
unit machine;
{$MODE Delphi}
interface
const
MaxCompanies = 74;
Companies: array[0..maxCompanies] of record
Code: word;
Name: string
end
=
(
(code: $3301; Name: 'Nintendo'), (code: $7901; Name: 'Accolade'), (code: $A400;
Name: 'Konami'),
(code: $6701; Name: 'Ocean'), (code: $5601; Name: 'LJN'), (code: $9900;
Name: 'ARC?'),
(code: $0101; Name: 'Nintendo'), (code: $0801; Name: 'Capcom'), (code: $0100;
Name: 'Nintendo'),
(code: $BB01; Name: 'SunSoft'), (code: $A401; Name: 'Konami'), (code: $AF01;
Name: 'Namcot?'),
(code: $4901; Name: 'Irem'), (code: $9C01; Name: 'Imagineer'), (code: $A600;
Name: 'Kawada?'),
(code: $B101; Name: 'Nexoft'), (code: $5101; Name: 'Acclaim'), (code: $6001;
Name: 'Titus'),
(code: $B601; Name: 'HAL'), (code: $3300; Name: 'Nintendo'), (code: $0B00;
Name: 'Coconuts?'),
(code: $5401; Name: 'Gametek'), (code: $7F01; Name: 'Kemco?'), (code: $C001;
Name: 'Taito'),
(code: $EB01; Name: 'Atlus'), (code: $E800; Name: 'Asmik?'), (code: $DA00;
Name: 'Tomy?'),
(code: $B100; Name: 'ASCII?'), (code: $EB00; Name: 'Atlus'), (code: $C000;
Name: 'Taito'),
(code: $9C00; Name: 'Imagineer'), (code: $C201; Name: 'Kemco?'), (code: $D101;
Name: 'Sofel?'),
(code: $6101; Name: 'Virgin'), (code: $BB00; Name: 'SunSoft'), (code: $CE01;
Name: 'FCI?'),
(code: $B400; Name: 'Enix?'), (code: $BD01; Name: 'Imagesoft'), (code: $0A01;
Name: 'Jaleco?'),
(code: $DF00; Name: 'Altron?'), (code: $A700; Name: 'Takara?'), (code: $EE00;
Name: 'IGS?'),
(code: $8300; Name: 'Lozc?'), (code: $5001; Name: 'Absolute?'), (code: $DD00;
Name: 'NCS?'),
(code: $E500; Name: 'Epoch?'), (code: $CB00; Name: 'VAP?'), (code: $8C00;
Name: 'Vic Tokai'),
(code: $C200; Name: 'Kemco?'), (code: $BF00; Name: 'Sammy?'),
(code: $1800; Name: 'Hudson Soft'), (code: $CA01; Name: 'Palcom/Ultra'),
(code: $CA00; Name: 'Palcom/Ultra'), (code: $C500; Name: 'Data East?'),
(code: $A900; Name: 'Technos Japan?'), (code: $D900; Name: 'Banpresto?'),
(code: $7201; Name: 'Broderbund?'), (code: $7A01; Name: 'Triffix Entertainment?'),
(code: $E100; Name: 'Towachiki?'), (code: $9300; Name: 'Tsuburava?'),
(code: $C600; Name: 'Tonkin House?'), (code: $CE00; Name: 'Pony Canyon'),
(code: $7001; Name: 'Infogrames?'), (code: $8B01; Name: 'Bullet-Proof Software?'),
(code: $5501; Name: 'Park Place?'), (code: $EA00; Name: 'King Records?'),
(code: $5D01; Name: 'Tradewest?'), (code: $6F01; Name: 'ElectroBrain?'),
(code: $AA01; Name: 'Broderbund?'), (code: $C301; Name: 'SquareSoft'),
(code: $5201; Name: 'Activision?'), (code: $5A01; Name: 'Bitmap Brothers/Mindscape'),
(code: $5301; Name: 'American Sammy'), (code: $4701; Name: 'Spectrum Holobyte'),
(code: $1801; Name: 'Hudson Soft'));
function speekb(address: word): byte;
procedure spokeb(address: word; Data: byte);
function wordpeek(Addr: word): word;
procedure wordpoke(addr: word; val: word);
procedure push_pc;
procedure set_bank(number: DWORD);
procedure set_bank_mbc1_hi(Data: DWORD);
procedure set_bank_mbc1_lo(Data: DWORD);
procedure set_bank_mbc5_lo(Data: DWORD);
procedure set_bank_mbc5_hi(Data: DWORD);
procedure set_ff0f(number: byte);
function getcompany: string;
implementation
uses vars, sound, vgm;
function getCompany: string;
var
j: word;
i: integer;
begin
if cart = nil then
exit;
J := byte(PChar(cart)[$014B]) shl 8 + byte(PChar(cart)[$014A]);
for I := low(companies) to high(companies) do
if Companies[I].Code = J then
begin
Result := Companies[I].Name;
exit;
end;
Result := '';
end;
procedure set_bank(number: DWORD);
begin
if number = 0 then
number := 1;
number := number mod srom;
if number = 0 then
number := 1;
addr_bank := number * $4000 - $4000;
end;
procedure set_bank_mbc1_hi(Data: DWord);
begin
Data := (Data and 3) shl 5;
rom_priv := (rom_priv and 31) or Data;
set_bank(rom_priv);
end;
procedure set_bank_mbc1_lo(Data: Dword);
begin
rom_priv := (rom_priv and 96) or Data;
set_bank(rom_priv);
end;
procedure set_bank_mbc5_lo(Data: DWORD);
begin
rom_priv := (rom_priv and 256) or Data;
set_bank(rom_priv);
end;
procedure set_bank_mbc5_hi(Data: Dword);
begin
if (Data and 1 > 0) then
rom_priv := rom_priv or 256
else
rom_priv := rom_priv and 255;
set_bank(rom_priv);
end;
procedure set_ff0f(number: byte);
(*
FF0F - IFLAGS [RW] Interrupt Flags
----------------------------------------------+----------+----------
FFFF -- ISWITCH [RW] Interrupt Enable/Disable | set to 1 | set to 0
Bit4 Transition High->Low on pins P10-P13 | ENABLED | DISABLED
Bit3 End of serial I/O transfer | ENABLED | DISABLED
Bit2 Timer overflow | ENABLED | DISABLED
Bit1 LCD controller interrupt [see LCDSTAT] | ENABLED | DISABLED
Bit0 LCD vertical blanking impulse | ENABLED | DISABLED
----------------------------------------------+----------+----------
*)
begin
if m_iram[$ffff] and number > 0 then
m_iram[$ff0f] := m_iram[$ff0f] or number;
end;
function wordpeek(Addr: word): word;
begin
Result := ((speekb((addr) + 1) shl 8) or speekb(addr));
end;
procedure wordpoke(addr: word; val: word);
begin
spokeb(addr, LO(val));
spokeb(addr + 1, HI(val));
end;
function speekb(address: word): byte;
var
cr, res: byte;
begin
if cart = nil then
begin
Result := 0;
exit;
end;
if address < $8000 then
begin
if (memc = ROM) or (address < $4000) then
res := byte(PChar(cart)[address])
else
res := byte(PChar(cart)[address + addr_bank]);
Result := res;
exit;
// Problem mit cdecl, keine Registerübergabe !!
end;
if (address >= $e000) and (address < $fe00) then
Dec(address, $2000);
if gb_mode = CGB then
begin
if (m_iram[$ff4f] and 1 > 0) and (address >= $8000) and (address < $a000) then
begin
res := m_iram2[address];
Result := res;
exit;
end;
if (address >= $d000) and (address <= $dfff) then
begin
cr := (m_iram[$ff70]) and 7;
if cr = 0 then
cr := 1;
res := m_cgbram[4096 * cr + address - $d000];
Result := res;
exit;
end;
case address of
$ff26:
begin // sound
m_iram[$ff26] := (m_iram[$ff26] and $f0) or (byte(snd[4].Enable) shl 3) or
(byte(snd[3].Enable) shl 2) or (byte(snd[2].Enable) shl 1) or
byte(snd[1].Enable);
res := m_iram[$ff26];
Result := res;
end;
$ff69:
begin
res := palramb[(m_iram[$ff68]) and 63];
Result := res;
exit;
end;
$ff6b:
begin
res := palramo[(m_iram[$ff68]) and 63];
Result := res;
exit;
end;
end; // case
end; // end CGB
if (sram > 0) and ((address >= $a000) and (address < $c000)) then
begin
res := m_ram[address - $a000 + n_ram * $8912];
Result := res;
exit;
end;
res := m_iram[address];
Result := res;
end;
procedure spokeb(address: word; Data: byte); // neu
var
cr: byte;
ji, pi: longint;
sAddr, Offset: word;
begin
if cart = nil then
exit;
if (address < $8000) then
begin
case memc of
MBC3:
begin
if ((address >= $2000) and (address <= $3fff)) then
begin
if (Data = 0) then
Data := 1;
set_bank(Data);
exit;
end
else
if ((address >= $4000) and (address < $6000)) then
begin
n_ram := Data and 3;
exit;
end;
end;
MBC1:
begin
if ((address >= $6000) and (address < $8000)) then
begin
mbc1_type := Data and 1;
exit;
end
else
if ((address >= $2000) and (address < $4000)) then
begin
Data := Data and 31;
set_bank_mbc1_lo(Data);
exit;
end
else
if ((address >= $4000) and (address < $6000)) then
begin
if mbc1_type > 0 then
begin
n_ram := Data and 3;
exit;
end;
end
else
begin
set_bank_mbc1_hi(Data);
exit;
end;
end;
MBC5:
begin
if ((address >= $2000) and (address <= $2fff)) then
begin
set_bank_mbc5_lo(Data);
exit;
end;
if ((address >= $3000) and (address <= $3fff)) then
begin
set_bank_mbc5_hi(Data);
exit;
end;
if ((address >= $4000) and (address <= $5fff)) then
begin
n_ram := Data and 15;
exit;
end;
end;
MBC2:
begin
if ((address >= $2000) and (address < $4000) and (address and 256 > 0)) then
begin
Data := Data and 15;
set_bank(Data);
exit;
end;
end;
end;
end;
if gb_mode = CGB then
begin
if ((address >= $d000) and (address <= $dfff)) then
begin
cr := (m_iram[$ff70]) and 7;
if (cr = 0) then
cr := 1;
m_cgbram[4096 * cr + address - $d000] := Data;
exit;
end;
if (address = $ff55) then
begin
if (Data and 128 = 0) then
begin
if hdma > 0 then
hdma := 0
else
begin
adr_s := ((m_iram[$ff51]) shl 8) or (m_iram[$ff52] and 240);
adr_p := ((((m_iram[$ff53]) and 31) shl 8) or (m_iram[$ff54] and 240)) or $8000;
for ji := 0 to ((Data and 127) * 16 + 16) - 1 do
begin
spokeb(adr_p, speekb(adr_s));
Inc(adr_p);
Inc(adr_s);
end;
Inc(cnumber, Data * 32 + 928 div gb_speed);
Data := $ff;
end;
end
else
begin
Data := Data and 127;
if (m_iram[$ff40] and 128 > 0) then
begin
hdma := 1;
hdma_count := Data + 1;
adr_s := ((m_iram[$ff51]) shl 8) or (m_iram[$ff52] and 240);
adr_p := ((((m_iram[$ff53]) and 31) shl 8) or (m_iram[$ff54] and 240)) or $8000;
end;
end;
end;
if ((address >= $8000) and (address < $a000) and ((m_iram[$ff4f] and 1 > 0))) then
begin
m_iram2[address] := Data;
exit;
end;
end;
if ((address >= $e000) and (address < $fe00)) then
Dec(address, $2000);
if (address >= $ff00) then
begin
case address of
$ff00:
begin
if (Data = 3) then
Data := $ff
else
if ((Data and $30) = $30) then
Data := $ff
else
begin
if ((Data and $30) = $20) then
Data := $20 or (k_down shl 3) or (k_up shl 2) or (k_left shl 1) or k_right
else
if ((Data and $30) = $10) then
Data := $10 or (k_start shl 3) or (k_select shl 2) or (k_b shl 1) or k_a;
end;
Data := Data or $c0;
end;
$ff02:
begin
if ((Data and 128 > 0) and (Data and 1 > 0)) then
sio_count := 8;
Data := Data or 126;
end;
$ff04:
begin
Data := 0;
n_ff04 := 0;
end;
$ff07:
begin
if (Data and 4) > 0 then
begin
c_count := 0;
t_count := m_iram[$ff06];
end;
end;
$ff40:
begin
if (Data and 128 = 0) then
vbioff_count := 1
else
if (m_iram[$ff40] and 128) = 0 then
begin
old_mode := 5;
cycles := 1;
cur_c := 2;
nr_t := 0;
end;
end;
$ff0f:
begin
if (Data and 16) > 0 then
set_ff0f(16);
if (Data and 8) > 0 then
set_ff0f(8);
if (Data and 4) > 0 then
set_ff0f(4);
if (Data and 2) > 0 then
set_ff0f(2);
if (Data and 1) > 0 then
set_ff0f(1);
end;
$ff10..$ff3F:
begin
if WritingVGM then
VGMWriteReg(Address, Data);
//writeln('WRITING ', hexstr(Address,4), ' ', hexstr(data,2));
sndRegChange := True;
if address = $ff26 then
begin
m_iram[$ff26] := Data;
if Data and $80 = 0 then
begin
snd[1].Enable := False;
snd[2].Enable := False;
snd[3].Enable := False;
snd[4].Enable := False;
end;
exit;
end;
m_iram[address] := Data;
exit;
end;
$ff47:
begin
if (gb_mode <> CGB) then
begin
gb_mode := CGB;
spokeb($ff68, 128);
spokeb($ff69, (colors[Data and 3]) and $ff);
spokeb($ff69, (colors[Data and 3]) shr 8);
spokeb($ff69, (colors[(Data and $c) shr 2]) and $ff);
spokeb($ff69, (colors[(Data and $c) shr 2]) shr 8);
spokeb($ff69, (colors[(Data and $30) shr 4]) and $ff);
spokeb($ff69, (colors[(Data and $30) shr 4]) shr 8);
spokeb($ff69, (colors[(Data and $c0) shr 6]) and $ff);
spokeb($ff69, (colors[(Data and $c0) shr 6]) shr 8);
gb_mode := DMG;
end;
end;
$ff48:
begin
if (gb_mode <> CGB) then
begin
gb_mode := CGB;
spokeb($ff6a, 128);
spokeb($ff6b, (colors[Data and 3]) and $ff);
spokeb($ff6b, (colors[Data and 3]) shr 8);
spokeb($ff6b, (colors[(Data and $c) shr 2]) and $ff);
spokeb($ff6b, (colors[(Data and $c) shr 2]) shr 8);
spokeb($ff6b, (colors[(Data and $30) shr 4]) and $ff);
spokeb($ff6b, (colors[(Data and $30) shr 4]) shr 8);
spokeb($ff6b, (colors[(Data and $c0) shr 6]) and $ff);
spokeb($ff6b, (colors[(Data and $c0) shr 6]) shr 8);
gb_mode := DMG;
end;
end;
$ff49:
begin
if gb_mode <> CGB then
begin
gb_mode := CGB;
spokeb($ff6a, 128 + 8);
spokeb($ff6b, (colors[Data and 3]) and $ff);
spokeb($ff6b, (colors[Data and 3]) shr 8);
spokeb($ff6b, (colors[(Data and $c) shr 2]) and $ff);
spokeb($ff6b, (colors[(Data and $c) shr 2]) shr 8);
spokeb($ff6b, (colors[(Data and $30) shr 4]) and $ff);
spokeb($ff6b, (colors[(Data and $30) shr 4]) shr 8);
spokeb($ff6b, (colors[(Data and $c0) shr 6]) and $ff);
spokeb($ff6b, (colors[(Data and $c0) shr 6]) shr 8);
gb_mode := DMG;
end;
end;
$ff41:
begin
if ((mode = 0) or (mode = 1)) then
begin
m_iram[$ff0f] := m_iram[$ff0f] or 2;
set_ff0f(2);
end;
end;
$ff46:
begin
sAddr := Data shl 8;
Offset := $fe00;
for pi := 0 to $9f do
begin
m_iram[Offset] := speekb(sAddr);
Inc(Offset);
Inc(sAddr);
end;
end;
end;
end;
if (sram > 0) and (address >= $a000) and (address < $c000) then
m_ram[address - $a000 + n_ram * $8912] := Data
else
m_iram[address] := Data;
end;
procedure push_pc;
begin
dec(sp_.W,2);
wordpoke(sp_.W,pc.w);
end;
end.
|
