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vic2mem.cpp
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vic2mem.cpp
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#include <stdio.h>
#include <string.h>
#include <memory.h>
#include "vic2mem.h"
#include "c64rom.h"
#include "Sid.h"
#include "Clockable.h"
#include "video.h"
#include "keys64.h"
#include "sound.h"
#include "tape.h"
#define NEWSDMA 1
#define RASTERX2TVCOL(X) (X < 400 ? X + 104 : X - 400)
#define SET_BITS(REG, VAL) { \
unsigned int i = 7; \
do { \
REG = ((VAL) & (1 << i)) == (1 << i); \
} while(i--); \
}
#define MOB_DO_PIXEL(X, COLOR) \
do { \
if (!(out[X] & 0x80)) { \
if (!(out[X] & 0x40)) { \
if (!spriteBckgCollReg) { \
vicReg[0x19] |= ((vicReg[0x1A] & 2) << 6) | 2; \
checkIRQflag(); \
} \
spriteBckgCollReg |= six; \
if (!priority) out[X] = COLOR; \
} else \
out[X] = 0x40 | COLOR;\
} \
} while(0);
#define STOP_SPRITE_DMA(X) \
do { \
spriteDMAmask &= ~(1 << X); \
if (!spriteDMAmask) \
vicBusAccessCycleStart = 0; \
} while(0);
#if NEWSDMA
#define DO_SPRITE_DMA(X) \
do { \
if (mob[X].dmaState) { \
unsigned int &dc = mob[X].dataCount; \
unsigned int &dcReload = mob[X].dataCountReload; \
unsigned char *sData = vicBase + mob[X].dataAddress + dcReload; \
unsigned char *sBuf = mob[X].sdb[0].shiftRegBuf; \
sBuf[0] = sData[0]; \
sBuf[1] = sData[1]; \
sBuf[2] = sData[2]; \
dc = dcReload + 3; \
} \
} while (0);
#else
#define DO_SPRITE_DMA(X) ;
#endif
#define MOB_READ_ADDRESS(X) mob[X].dataAddress = (VideoBase[0x03F8 + X] << 6); // if (mob[X].dmaState)
static unsigned char cycleLookup[][128] = {
// SCREEN: |===========0102030405060708091011121314151617181920212223242526272829303132333435363738391111=========
// coordinate: 111111111111111111111111111111
// 0000000000111111111122222222223333333333444444444455555555556666666666777777777788888888889999999999000000000011111111112222222222
// 0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
// first cycles:
// 0102030405060708091011121314151617181920....................................................................555657585960616263
// beamX:
// 11111111111111111111111111
// 000000000011111111112222220000000000111111111122222222223333333333444444444455555555556666666666777777777788888888889999999999
// 012345678901234567890123450123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
// NO BADLINE
//"3 i 4 i 5 i 6 i 7 i r r r r r g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g i i 0 i 1 i 2 i "
{ "r r g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g g gsisis0sis1sis2sis3sis4sis5sis6sis7sisr r r "},
// bad line
//"33i344i455i566i677i7r r*r*r*rcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcg i i 00i011i122i2"}
{ "r*rcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgcgsisis0sis1sis2sis3sis4sis5sis6sis7sisr r*r*"}
};
static unsigned char prevY;
Vic2mem::Vic2mem() : gamepin(1), exrom(1), reu(0)
{
instance_ = this;
setId("VIC2");
if (!sidCard)
enableSidCard(true, 0);
sidCard->setFrequency(VIC_SOUND_CLOCK);
sidCard->setModel(SID6581);
masterClock = VIC_REAL_CLOCK_M10;
colorRAM = new unsigned char[0x0400];
actram = Ram;
loadroms();
chrbuf = DMAbuf;
// for sideborder effects prefill excess area with space (workaround)
memset(chrbuf + 40, 32, 24);
// setting screen memory pointer
scrptr = screen;
// important for sprite-bg collisions: fill blank area with border black
memset(screen, 0x80, VIC_PIXELS_PER_ROW * 312);
TVScanLineCounter = 0;
beamy = beamx = 0;
framecol = 0x80808080;
//
mobExtCol[0] = 0xFF;
unsigned int i;
for(i = 0; i < 256; i++) {
collisionLookup[i] = i;
}
for(i = 0; i < 8; i++) {
collisionLookup[1ULL << i] = 0;
mob[i].sdb[0].dwSrDmaBuf = mob[i].sdb[1].dwSrDmaBuf = 0;
}
//
irqFlag = 0;
vicBase = Ram;
charrombank = charRomC64;
charrom = false;
tap->mem=this;
keys64 = new KEYS64;
// CIA's
cia[0].setIrqCallback(setCiaIrq, this);
//
Reset(true);
// remove TED sound (inherited) from the list
SoundSource::remove(this);
enableREU(reuSizeKb);
}
Vic2mem::~Vic2mem()
{
delete[] colorRAM;
delete keys64;
}
void Vic2mem::triggerNMI()
{
cia[1].icr |= 0x10;
cpuptr->triggerNmi();
if (cia[1].icr & cia[1].irq_mask & 0x7F) {
cia[1].icr |= 0x80;
//cpuptr->clearNmi();
}
}
void Vic2mem::Reset(unsigned int resetLevel)
{
// reset memory banks
if (resetLevel & 1) {
mem_8000_bfff = rom[0];
mem_c000_ffff = rom[0] + 0x4000;
}
// clear RAM with powerup pattern and reload ROM's
if (resetLevel & 2) {
for (int i = 0; i < RAMSIZE; i++)
Ram[i] = (i >> 1) << 1 == i ? 0 : 0xFF;
loadroms();
}
// empty collision buffers
memset(spriteCollisions, 0, sizeof(spriteCollisions));
memset(spriteBckgColl, 0, sizeof(spriteBckgColl));
spriteBckgCollReg = spriteCollisionReg = 0;
//
vicBusAccessCycleStart = spriteDMAmask = 0;
for (int i = 0; i < 8; i++) {
mob[i].dataCount = 0;
mob[i].dataCountReload = 0;
mob[i].reloadFlipFlop = 0;
mob[i].x = 0;
mob[i].y = 0;
mob[i].dmaState = false;
mob[i].rendering = false;
mob[i].enabled = 0;
}
//
soundReset();
cia[0].reset();
cia[1].reset();
vicReg[0x19] = 0;
prp = 7;
prddr = 0;
}
void Vic2mem::dumpState()
{
// always called during end of screen (X=100; Y=0)
saveVar(Ram, RAMSIZE);
saveVar(&prp, sizeof(prp));
saveVar(&prddr, sizeof(prddr));
saveVar(serialPort, sizeof(serialPort[0]));
saveVar(colorRAM, 0x0400);
saveVar(&beamx, sizeof(beamx));
saveVar(&beamy, sizeof(beamy));
saveVar(&irqline, sizeof(irqline));
saveVar(&crsrpos, sizeof(crsrpos));
saveVar(&scrattr, sizeof(scrattr));
saveVar(&nrwscr, sizeof(nrwscr));
saveVar(&hshift, sizeof(hshift));
saveVar(&vshift, sizeof(vshift));
saveVar(&fltscr, sizeof(fltscr));
saveVar(&mcol, sizeof(mcol));
saveVar(chrbuf, 40);
saveVar(&charrom, sizeof(charrom));
saveVar(&charbank, sizeof(charbank));
saveVar(&framecol, sizeof(framecol));
//
saveVar(&vicReg, sizeof(vicReg) / sizeof(vicReg[0]));
saveVar(&cia[0].reg, sizeof(cia[0].reg) / sizeof(cia[0].reg[0]));
saveVar(&cia[1].reg, sizeof(cia[1].reg) / sizeof(cia[1].reg[0]));
}
void Vic2mem::readState()
{
readVar(Ram, RAMSIZE);
readVar(&prp, sizeof(prp));
readVar(&prddr, sizeof(prddr));
readVar(serialPort, sizeof(serialPort[0]));
readVar(colorRAM, 0x0400);
readVar(&beamx, sizeof(beamx));
readVar(&beamy, sizeof(beamy));
readVar(&irqline, sizeof(irqline));
readVar(&crsrpos, sizeof(crsrpos));
readVar(&scrattr, sizeof(scrattr));
readVar(&nrwscr, sizeof(nrwscr));
readVar(&hshift, sizeof(hshift));
readVar(&vshift, sizeof(vshift));
readVar(&fltscr, sizeof(fltscr));
readVar(&mcol, sizeof(mcol));
readVar(chrbuf, 40);
readVar(&charrom, sizeof(charrom));
readVar(&charbank, sizeof(charbank));
readVar(&framecol, sizeof(framecol));
//
readVar(&vicReg, sizeof(vicReg) / sizeof(vicReg[0]));
readVar(&cia[0].reg, sizeof(cia[0].reg) / sizeof(cia[0].reg[0]));
readVar(&cia[1].reg, sizeof(cia[1].reg) / sizeof(cia[1].reg[0]));
//
for (unsigned int i = 0; i < 16; i++) {
cia[0].write(i, cia[0].reg[i]);
cia[1].write(i, cia[1].reg[i]);
}
for (unsigned int i = 0; i < 0x30; i++) {
Write(0xD000 + i, vicReg[i]);
}
Write(0, prddr);
Write(1, prp);
}
void Vic2mem::loadromfromfile(int nr, const char fname[512], unsigned int offset)
{
FILE *img;
if ((img = fopen(fname, "rb"))) {
// note: this is only the minimum!
const unsigned int crthdrsize = 64;
unsigned char crtheader[crthdrsize];
size_t r = fread(crtheader, 1, crthdrsize, img);
if (!strncmp((char*)crtheader, "C64 CARTRIDGE", 13)) {
const unsigned int chiphdrsize = 16;
unsigned char chipheader[chiphdrsize];
unsigned int size, loadaddress;
const unsigned int crtversionMain = crtheader[0x14];
const unsigned int crtversionSub = crtheader[0x15];
const unsigned int crtType = crtheader[0x17] | (crtheader[0x16] << 8);
fprintf(stderr, "CRT image version: %u.%u, type: %u\n", crtversionMain, crtversionSub, crtType);
r = fread(chipheader, 1, chiphdrsize, img);
if (!strncmp((char*)chipheader, "CHIP", 4)) {
loadaddress = chipheader[0x0D] | (chipheader[0x0C] << 8);
size = chipheader[0x0F] | (chipheader[0x0E] << 8);
exrom = crtheader[0x18];
gamepin = crtheader[0x19];
if (size <= 0x2000)
offset = loadaddress & 0x3000;
// load ROM/CRT file
r = fread(rom[nr] + offset, size, 1, img);
fprintf(stderr, " CHIP data loaded: %04X-%04X EXROM:%u GAME:%u\n", loadaddress, loadaddress + size - 1, exrom, gamepin);
fclose(img);
//
changeMemoryBank(prp | ~prddr, exrom, gamepin);
Reset(0);
cpuptr->Reset();
return;
}
}
}
memset(rom[nr] + offset, 0, ROMSIZE);
bool restart = !(exrom & gamepin);
exrom = gamepin = 1;
changeMemoryBank(prp | ~prddr, exrom, gamepin);
if (restart) {
Reset(1);
cpuptr->Reset();
}
}
void Vic2mem::loadroms()
{
memcpy(rom[0], basicRomC64, basicRomC64_size);
memcpy(rom[0] + 0x4000, kernalRomC64, kernalRomC64_size);
mem_8000_bfff = rom[0];
mem_8000_9fff = Ram + 0x8000;
mem_c000_ffff = rom[0] + 0x4000;
#if FAST_BOOT
// TODO: check ROM pattern
unsigned char patch[] = { 0xA0, 0xA0, 0xA2, 0x00, 0x84, 0xC1, 0x86, 0xC2 };
memset(mem_c000_ffff + 0x1D68, 0xEA, 0x24);
memcpy(mem_c000_ffff + 0x1D68, patch, sizeof(patch));
#endif
}
void Vic2mem::setCpuPtr(CPU *cpu)
{
cpuptr = cpu;
cia[1].setIrqCallback(setCiaNmi, cpuptr);
}
void Vic2mem::copyToKbBuffer(const char *text, unsigned int length)
{
if (!length)
length = (unsigned int) strlen(text);
Write(0xc6, length);
while (length--)
Write(0x0277 + length, text[length]);
}
Color Vic2mem::getColor(unsigned int ix)
{
const double bsat = 43.0;
const Color color[16] = {
{ 0, 0, 0 }, { 0, 5.0, 0 },
#ifndef MOS6569R1
#if 0 // speculative
{ 112.5, 2.9375, bsat }, { 292.5, 3.875, bsat },
{ 45, 3.125, bsat }, { 225, 3.5, bsat }, { 0, 2.75, bsat }, { 180, 4.25, bsat},
{ 135, 3.125, bsat }, { 157.5, 2.75, bsat }, { 112.5, 3.5, bsat }, { 0, 2.9375, 0 },
{ 0, 3.41, 0 }, { 225, 4.25, bsat }, { 0, 3.41, bsat }, { 0, 3.875, 0 }
#else // measured
#if 0 // my TV card ~TED hues
{ 96, 2.9375, bsat },{ 283, 3.875, bsat },
{ 56, 3.125, bsat },{ 245, 3.5, bsat },{ 350, 2.75, bsat },{ 167, 4.25, bsat },
{ 126, 3.125, bsat },{ 147, 2.75, bsat },{ 96, 3.5, bsat },{ 0, 2.9375, 0 },
{ 0, 3.41, 0 },{ 245, 4.25, bsat },{ 350, 3.41, bsat },{ 0, 3.875, 0 }
#else // screenshot
//{ 96, 2.9375, bsat },{ 283, 3.875, bsat },
//{ 55, 3.125, bsat },{ 241, 3.5, bsat },{ 347, 2.75, bsat },{ 167, 4.25, bsat },
//{ 129, 3.125, bsat },{ 148, 2.75, bsat },{ 96, 3.5, bsat },{ 0, 2.9375, 0 },
//{ 0, 3.41, 0 },{ 241, 4.25, bsat },{ 347, 3.41, bsat },{ 0, 3.875, 0 }
// measured from a C64C direct composite picture shot
{ 100, 2.9, bsat },{ 280, 4.1, bsat },
{ 47, 3.2, bsat },{ 227, 3.68, bsat },{ 343, 2.75, bsat },{ 163, 4.70, bsat },
{ 123, 3.2, bsat },{ 143, 2.75, bsat },{ 103, 3.68, bsat },{ 0, 2.9, 0 },
{ 0, 3.5, 0 },{ 233, 4.70, bsat },{ 343, 3.5, bsat },{ 0, 4.1, 0 }
#endif
#endif
#else // 6569R1
{ 96, 3.0, bsat },{ 282, 4.5, bsat },
{ 55, 3.5, bsat },{ 245, 3.5, bsat },{ 350, 3.0, bsat },{ 167, 4.5, bsat },
{ 126, 3.5, bsat },{ 140, 3.0, bsat },{ 96, 3.5, bsat },{ 0, 3.0, 0 },
{ 0, 3.5, 0 },{ 245, 4.5, bsat },{ 350, 3.5, bsat },{ 0, 4.5, 0 }
#endif
};
return color[ix & 0xF];
}
void Vic2mem::soundReset()
{
if (sidCard)
sidCard->reset();
}
unsigned int Vic2mem::getVicBaseAddress()
{
const unsigned int vicBank = (((cia[1].pra | ~cia[1].ddra) ^ 0xFF) & 3) << 14;
return vicBank;
}
void Vic2mem::changeCharsetBank()
{
const unsigned int vicBaseAddr = getVicBaseAddress();
vicBase = Ram + vicBaseAddr;
// video matrix base address
const unsigned int vmOffset = ((vicReg[0x18] & 0xF0) << 6);
VideoBase = vicBase + vmOffset;
// character bitmap data
const unsigned int cSetOffset = ((vicReg[0x18] & 0x0E) << 10);
cset = (!(vicBaseAddr & 0x4000) && ((cSetOffset & 0x3000) == 0x1000)) // 4 or 6
? charrombank + (cSetOffset & 0x0800) : vicBase + cSetOffset;
grbank = vicBase + ((vicReg[0x18] & 8) << 10);
#if 0
fprintf(stderr, "VIC bank: %04X, grbank:%04X matrix:%04X cset:%04X(%u) in line:%03i pra:%02X ddra:%02X vic18:%02X\n",
vicBaseAddr, (vicReg[0x18] & 8) << 10, vmOffset, cSetOffset, cset != (vicBase + cSetOffset),
beamy, cia[1].pra, cia[1].ddra, vicReg[0x18]);
#endif
}
void Vic2mem::changeMemoryBank(unsigned int port, unsigned int ex, unsigned int game)
{
bool ultimax = exrom && !game;
// TODO: make it a table
mem_8000_bfff = ((port & 3) == 3) ? rom[0] : Ram + 0xa000; // a000..bfff
mem_c000_ffff = ((port & 2) == 2) ? rom[0] + 0x4000 : Ram + 0xe000; // e000..ffff
charrom = (!(port & 4) && (port & 3)) && !ultimax;
mem_8000_9fff = Ram + 0x8000;
mem_1000_3fff = Ram;
// Ultimax mode?
if (ultimax) {
mem_8000_9fff = rom[1];
mem_c000_ffff = rom[1] + 0x2000;
mem_1000_3fff = rom[1];
// HACK! Cart ROM is mirrored at lowest VIC bank in Ultimax mode
memcpy(Ram + 0x1000, rom[1] + 0x1000, 0x3000);
changeCharsetBank();
} else if (!exrom) {
if ((port & 3) == 3) {
mem_8000_9fff = rom[1];
}
if (!gamepin && (port & 2)) {
mem_8000_bfff = rom[1] + 0x2000;
}
}
#if 0
static int oldval = -1;
int newval = ex + game + port;
if (oldval != newval) {
fprintf(stderr, "Mem banking. prp:%02X ddrp:%02X ex:%02X game:%02X port:%02X in line:%03i.\n", prp, prddr, ex, game, port, beamy);
oldval = newval;
}
#endif
}
void Vic2mem::setCiaIrq(void *param)
{
Vic2mem *mh = reinterpret_cast<Vic2mem*>(param);
mh->irqFlag |= 0x40;
//fprintf(stderr, "CIA1 irq @ PC=%04X @ cycle=%i\n", mh->cpuptr->getPC(), CycleCounter);
}
void Vic2mem::setCiaNmi(void *param)
{
CPU *cpu = reinterpret_cast<CPU*>(param);
cpu->triggerNmi();
}
inline void Vic2mem::checkIRQflag()
{
irqFlag |= (vicReg[0x19] & 0x80);
}
void Vic2mem::doDelayedDMA()
{
if (attribFetch) {
bool nowBadLine = (vshift == (beamy & 7)) & (beamy != 247);
if (nowBadLine) {
if (!BadLine && (beamx <= 86 || beamx >= 124)) {
int delay;
int illegalRead;
if (!vicBusAccessCycleStart)
vicBusAccessCycleStart = CycleCounter;
//BadLine = 1;
if (!VertSubActive) {
// FIXME one cycle delay
VertSubActive = true;
delay = (beamx <= 86) ? ((beamx) >> 1) + 0 : (beamx - 124) >> 0;
} else {
delay = 0;
}
if (delay <= 40) {
delayedDMA = true;
dmaCount = 40 - delay;
if (CharacterPosition + dmaCount >= 0x0400) {
memcpy(chrbuf, VideoBase + CharacterPosition, 0x400 - CharacterPosition);
memcpy(chrbuf + 0x400 - CharacterPosition, VideoBase, (CharacterPosition + dmaCount) & 0x03FF);
} else {
memcpy(chrbuf, VideoBase + CharacterPosition, dmaCount);
}
} else {
if (!VertSubActive)
dmaCount = 0;
}
}
/*fprintf(stderr, "Bad line (DMAdelay:%i) @ XSCR=%i X=%i Y=%i(%02X) VSC=%u CP=%04u DMAC=%i @ PC=%04X\n", delayedDMA,
hshift, beamx, beamy, beamy, vertSubCount, CharacterPosition, dmaCount, cpuptr->getPC());*/
VertSubActive = true;
BadLine = 1;
} else {
BadLine = 0;
//if (BadLine)
// fprintf(stderr, "Bad line stopped @ XSCR=%i X=%i Y=%i(%02X) VSC=%02X DMAC=%i @ PC=%04X\n",
// hshift, beamx, beamy, beamy, vertSubCount, dmaCount, cpuptr->getPC());
}
}
}
void Vic2mem::UpdateSerialState(unsigned char newPort)
{
static unsigned char prevPort = 0x01;
if (prevPort ^ newPort) {
serialPort[0] = ((newPort << 2) & 0x80) // DATA OUT -> DATA IN
| ((newPort << 2) & 0x40) // CLK OUT -> CLK IN
| ((newPort << 1) & 0x10); // ATN OUT -> ATN IN (drive)
updateSerialDevices(serialPort[0]);
prevPort = newPort;
#if LOG_SERIAL
fprintf(stderr, "$DD00 write : %02X @ PC=%04X in cycle:%llu\n", value, cpuptr->getPC(), CycleCounter);
fprintf(stderr, " serial port written: %02X.\n", serialPort[0]);
#endif
}
}
// read memory through memory decoder
unsigned char Vic2mem::Read(unsigned int addr)
{
switch (addr & 0xF000) {
case 0x0000:
switch (addr & 0xFFFF) {
case 0:
return prddr;
case 1:
return (prp & prddr) | ((portState | 0x17) & ~prddr & 0xDF & (!(tap->IsButtonPressed()) << 4));
default:
return actram[addr & 0xFFFF];
}
default:
return actram[addr & 0xFFFF];
case 0x8000:
case 0x9000:
return mem_8000_9fff[addr & 0x1FFF];
case 0xA000:
case 0xB000:
return mem_8000_bfff[addr & 0x1FFF];
case 0xE000:
case 0xF000:
return mem_c000_ffff[addr & 0x1FFF];
case 0xD000:
if (!((prp | ~prddr) & 3) && !(exrom & ~gamepin))
return actram[addr & 0xFFFF];
else if (charrom && !(exrom & ~gamepin)) {
return charRomC64[addr & 0x0FFF];
} else {
switch ( addr >> 8 ) {
case 0xD0: // VIC2
case 0xD1:
case 0xD2:
case 0xD3:
addr &= 0x3F;
switch (addr) {
case 0x11:
return (vicReg[0x11] & 0x7f) | ((beamy & 0x100) >> 1);
case 0x12:
return beamy & 0xFF;
case 0x13: // LPX
return lpLatchX;
case 0x14: // LPY
return lpLatchY;
case 0x16:
return vicReg[0x16] | 0xC0;
case 0x18:
return vicReg[0x18] | 1;
case 0x19:
return vicReg[0x19] | 0x70;
case 0x1A:
return vicReg[0x1A] | 0xF0;
case 0x1E:
{ // sprite-sprite collision
unsigned char rv = spriteCollisionReg;
spriteCollisionReg = 0;
return rv;
}
case 0x1F:
{ // sprite-background collision
unsigned char rv = spriteBckgCollReg;
spriteBckgCollReg = 0;
return rv;
}
case 0x20:
return framecol | 0xF0;
case 0x21:
case 0x22:
case 0x23:
case 0x24:
return ecol[(addr & 0x3F) - 0x21] | 0xF0;
case 0x25:
case 0x26:
return mobExtCol[((addr - 0x25) << 1) + 1] | 0xF0;
case 0x27:
case 0x28:
case 0x29:
case 0x2A:
case 0x2B:
case 0x2C:
case 0x2D:
case 0x2E:
return vicReg[addr] | 0xF0;
case 0x2F: // unconnected
return 0xFF;
}
return vicReg[addr];
case 0xD4: // SID
case 0xD5:
case 0xD6:
case 0xD7:
if (sidCard) {
//flushBuffer(CycleCounter, VIC_SOUND_CLOCK);
sidCard->catchUpOnState(CycleCounter);
return sidCard->read(addr & 0x1F);
}
return 0xD4;
case 0xD8: // Color RAM
case 0xD9:
case 0xDA:
case 0xDB:
return colorRAM[addr & 0x03FF];
case 0xDC: // CIA1
{
unsigned char retval;
switch (addr & 0x0F) {
case 0x00:
retval = cia[0].read(0)
& keys64->getJoyState(1)
& keys64->feedKeyColumn((cia[0].prb | ~cia[0].ddrb) & keys64->getJoyState(0));
return retval;
case 0x01: // port B usually not driven low by port A.
#if 1
{
static unsigned char oldRetval = 0xFF;
retval = ((keys64->feedkey((cia[0].pra | ~cia[0].ddra)
& keys64->getJoyState(1)) ) // | (cia[0].read(1) & 0xC0)
& keys64->readPaddleFireButton(0)
& ~cia[0].ddrb)
| (cia[0].read(1) & cia[0].ddrb);
if ((oldRetval & 0x10) && !(retval & 0x10))
latchCounters();
oldRetval = retval;
}
#else
retval = cia[0].read(1)
& (keys64->feedkey(cia[0].read(0)) & keys64->getJoyState(1) | cia[0].ddrb);
#endif
//fprintf(stderr, "$Kb(%02X,%02X) read: %02X\n", cia[0].pra, cia[0].ddra, retval);
return retval;
case 0x0D:
retval = cia[0].read(0x0D);
irqFlag &= ~0x40;
break;
default:
retval = cia[0].read(addr);
}
/*fprintf(stderr, "CIA1(%02X) read:%02X @ PC=%04X @ cycle=%i\n", addr & 0x1f, retval,
cpuptr->getPC(), CycleCounter);*/
return retval;
}
case 0xDD: // CIA2
switch (addr & 0x0F) {
case 0:
return (readBus() & 0xC0) | (cia[1].read(0) & 0x3F);
case 0xD:
{
unsigned char retval = cia[1].read(0xD);
cpuptr->clearNmi();
/*fprintf(stderr, "CIA2(%02X) read:%02X @ PC=%04X @ cycle=%lli\n", addr & 0x1f, retval,
cpuptr->getPC(), CycleCounter);*/
return retval;
}
default:
;
}
/*fprintf(stderr, "CIA2(%02X) read:%02X @ PC=%04X @ cycle=%lli\n", addr & 0x1f, cia[1].read(addr & 0xf),
cpuptr->getPC(), CycleCounter);*/
return cia[1].read(addr);
case 0xDF:
if (reu) {
return reu->Read(addr);
}
default: // open address space
return readFloatingBus(addr); // cpuptr->getcins();
}
}
}
}
void Vic2mem::Write(unsigned int addr, unsigned char value)
{
switch (addr & 0xF000) {
case 0x0000:
{
unsigned char port;
switch ( addr & 0xFFFF ) {
case 0:
prddr = value;
goto skip;
case 1:
if ((prp ^ value) & 0x20)
tap->setTapeMotor(CycleCounter, !(value & 0x20));
prp = value;
skip:
portState = (portState & ~prddr) | (prp & 0xC8 & prddr);
port = prp | ~prddr;
changeMemoryBank(port, exrom, gamepin);
return;
default:
actram[addr & 0xFFFF] = value;
}
}
return;
case 0xF000:
if (reu && addr == 0xFF00) {
reu->startDMA();
}
default:
actram[addr & 0xFFFF] = value;
return;
case 0xD000:
if (!((prp | ~prddr) & 3) && !(exrom & ~gamepin)) { // should be read(1)
actram[addr & 0xFFFF] = value;
} else if (!charrom || (exrom & ~gamepin)) {
//unsigned int i;
switch ( addr >> 8 ) {
case 0xD0: // VIC2
case 0xD1:
case 0xD2:
case 0xD3:
addr &= 0x3F;
switch (addr) {
case 0x12:
if ((irqline ^ value) & 0xFF )
{
/*fprintf(stderr, "Raster IRQ set to %03i(%03X) @ PC=0%04X @ cycle=%i\n",
irqline, value, cpuptr->getPC(), CycleCounter); */
irqline = (irqline & 0x100) | value;
if (beamy == irqline) {
vicReg[0x19] |= ((vicReg[0x1A] & 1) << 7) | 1;
checkIRQflag();
}
}
break;
case 0x11:
// raster IRQ line
if (((irqline >> 1) ^ value) & 0x80 )
{
irqline = (irqline & 0xFF) | ((value & 0x80) << 1);
if (beamy == irqline) {
vicReg[0x19] |= ((vicReg[0x1A] & 1) << 7) | 1;
checkIRQflag();
}
}
// get vertical offset of screen when smooth scroll
vshift = value & 0x07;
// check for flat screen (23 rows)
fltscr = !(value&0x08);
// check for extended mode
// check for graphics mode (5th b14it)
scrattr = (scrattr & ~(GRAPHMODE|EXTCOLOR))|(value & (GRAPHMODE|EXTCOLOR));
// Check if screen is turned on
if (value & 0x10 && beamy == 48 && !attribFetch) {
attribFetch = true;
} else if (attribFetch && ((fltscr && beamy == 48+7) || (!fltscr && beamy == 48+3))) {
ScreenOn = true;
} else if ((beamy == 48+199 && fltscr) || (beamy == 48+203 && !fltscr)) {
ScreenOn = false;
}
doDelayedDMA();
/*fprintf(stderr, "d011: %02X @ X=%03i @ Y=%03i($%03X) BL=%u VSUB=%u DMA=%u CP=%04X PC=%04X\n", value,
beamx, beamy, beamy, BadLine, vertSubCount, dmaCount, CharacterPosition, cpuptr->getPC());*/
break;
case 0x16:
// check for narrow screen (38 columns)
nrwscr = value & 0x08;
// get horizontal offset of screen when smooth scroll
if (CharacterWindow)
doXscrollChange(hshift, value & 0x07);
hshift = value & 0x07;
scrattr = (scrattr & ~(MULTICOLOR)) | (value & (MULTICOLOR));
//fprintf(stderr, "$D016 write: %02X @ PC=%04X @ X=%03i @ Y=%03i\n", value, cpuptr->getPC(), beamx, beamy);
break;
case 0x18:
vicReg[0x18] = value;
changeCharsetBank();
break;
case 0x19:
vicReg[0x19] &= (0x0F & ~value);
// check if we have a pending IRQ
if ((vicReg[0x1a]) & 0x0F & vicReg[0x19]) {
vicReg[0x19] |= 0x80;
irqFlag |= 0x80;
} else {
vicReg[0x19] &= 0x7F;
irqFlag &= ~0x80;
}
//fprintf(stderr, "IRQ ack. write:%02X value:%02X @ PC=%04X @ cycle=%i\n",
// value, vicReg[0x19], cpuptr->getPC(), CycleCounter);
return;
case 0x1a:
// check if we have a pending IRQ
if ((vicReg[0x19]) & 0x0F & value) {
vicReg[0x19] |= 0x80;
irqFlag |= 0x80;
} else {
vicReg[0x19] &= 0x7F;
irqFlag &= ~0x80;
}
break;
case 0x20:
// distinguish border in the rendered screen with 0x80
value = (value & 0x0F) | 0x80;
framecol = (value << 24) | (value << 16) | (value << 8) | value;
break;
case 0x21:
ecol[0] = bmmcol[0] = mcol[0] = (value & 0x0F) | 0x40;
break;
case 0x22: // '01' counts as background as well
ecol[1] = mcol[1] = (value & 0x0F) | 0x40;
break;
case 0x23:
ecol[2] = mcol[2] = value & 0x0F;
break;
case 0x24:
ecol[3] = value & 0x0F;
break;
// sprites
case 0x00:
case 0x02:
case 0x04:
case 0x06:
case 0x08:
case 0x0A:
case 0x0C:
case 0x0E:
mob[addr >> 1].x = (mob[addr >> 1].x & 0x0100) | value;
//fprintf(stderr, "Sprite%i:%i m_x: %u\n", addr >> 1, value, mob[addr >> 1].x);
break;
case 0x01:
case 0x03:
case 0x05:
case 0x07:
case 0x09:
case 0x0B:
case 0x0D:
case 0x0F:
mob[addr >> 1].y = (value);
//fprintf(stderr, "Sprite%i:%i : %u\n", addr >> 1, value, mob[addr >> 1].y);
break;
case 0x10:
{
unsigned int i = 7;
do {
mob[i].x = ((mob[i].x & 0xFF) | ((value << (8 - i)) & 0x100));
//fprintf(stderr, "Sprite%i:%i m8x: %u\n", i, value, mob[i].x);
} while (i--);
}
break;
case 0x15:
SET_BITS(mob[i].enabled, value);
break;
case 0x17:
// sprite crunch?
if (beamx == 2) {
unsigned int i = 7;
do {
unsigned int bit = (1 << i);
unsigned int newBitOn = value & bit;
if ((vicReg[0x17] & bit) && !newBitOn) {
unsigned int &dcReload = mob[i].dataCountReload;
unsigned int dc = (dcReload + 3) & 0x3F;
dcReload = (0x2A & dcReload & dc) | (0x15 & (dcReload | dc));
}
mob[i].expandY = mob[i].reloadFlipFlop = !!newBitOn;
} while(i--);
} else
{
SET_BITS(mob[i].expandY, value);
SET_BITS(mob[i].reloadFlipFlop, value);
}
break;
case 0x1B:
SET_BITS(mob[i].priority, value);
break;
case 0x1C:
SET_BITS(mob[i].multicolor, value);
break;
case 0x1D:
SET_BITS(mob[i].expandX, value);
break;
case 0x25:
case 0x26:
mobExtCol[((addr - 0x25) << 1) + 1] = value & 0x0F;
break;
case 0x27:
case 0x28:
case 0x29:
case 0x2A:
case 0x2B:
case 0x2C:
case 0x2D:
case 0x2E:
mob[addr - 0x27].color = value & 0x0F;
break;
}
vicReg[addr] = value;
return;
case 0xD4: // SID
case 0xD5:
case 0xD6:
case 0xD7:
if (sidCard) {
//sidCard->catchUpOnState(CycleCounter);
sidCard->updateLastCycleCount(CycleCounter);
flushBuffer(CycleCounter, VIC_SOUND_CLOCK);
sidCard->write(addr & 0x1f, value);
}
return;
case 0xD8: // Color RAM
case 0xD9:
case 0xDA:
case 0xDB:
colorRAM[addr & 0x03FF] = value;
return;
case 0xDC: // CIA1
switch (addr & 0x0F) {
// key matrix row select & LP irq
case 1:
case 3:
{
unsigned char oldPortOut = cia[0].prb | ~cia[0].ddrb;
cia[0].write(addr, value);
unsigned char newPortOut = cia[0].prb | ~cia[0].ddrb;
if ((oldPortOut & 0x10) && !(newPortOut & 0x10)) {
latchCounters();
}
}
return;
case 0:
cia[0].write(addr, value);
return;
default:;
}
//fprintf(stderr, "CIA1(%02X) write: %02X @ PC=%04X\n", addr & 0x0f, value, cpuptr->getPC());
cia[0].write(addr, value);
return;
case 0xDD: // CIA2
switch (addr & 0x0F) {
case 2:
cia[1].write(2, value);
UpdateSerialState(~cia[1].pra & cia[1].ddra);
changeCharsetBank();
return;
case 0:
cia[1].write(0, value & 0x3F);
// VIC base
changeCharsetBank();
// serial IEC
UpdateSerialState(~cia[1].pra & cia[1].ddra);
return;
default:
break;
}
//fprintf(stderr, "CIA2(%02X) write: %02X @ PC=%04X\n", addr & 0x0f, value, cpuptr->getPC());
cia[1].write(addr, value);
return;
case 0xDF:
if (reu) {
reu->Write(addr, value);
}
return;
default: // $DExx/$DFxx open I/O
//actram[addr & 0xFFFF] = value;
return;
}
} else {
actram[addr & 0xFFFF] = value;
}
return;
}
}
void Vic2mem::latchCounters()
{
// once per frame only
if (!lpLatched) {
lpLatched = true;
lpLatchX = beamx << 1;
lpLatchY = beamy;
vicReg[0x19] |= ((vicReg[0x1A] & 8) << 4) | 8;
checkIRQflag();
}
}
void Vic2mem::doHRetrace()
{