| 1 |
/* |
| 2 |
* C64.cpp - Put the pieces together |
| 3 |
* |
| 4 |
* Frodo (C) 1994-1997,2002-2005 Christian Bauer |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 |
*/ |
| 20 |
|
| 21 |
#include "sysdeps.h" |
| 22 |
|
| 23 |
#include "C64.h" |
| 24 |
#include "CPUC64.h" |
| 25 |
#include "CPU1541.h" |
| 26 |
#include "VIC.h" |
| 27 |
#include "SID.h" |
| 28 |
#include "CIA.h" |
| 29 |
#include "REU.h" |
| 30 |
#include "IEC.h" |
| 31 |
#include "1541job.h" |
| 32 |
#include "Display.h" |
| 33 |
#include "Prefs.h" |
| 34 |
|
| 35 |
#if defined(__unix) && !defined(__svgalib__) |
| 36 |
#include "CmdPipe.h" |
| 37 |
#endif |
| 38 |
|
| 39 |
|
| 40 |
#ifdef FRODO_SC |
| 41 |
bool IsFrodoSC = true; |
| 42 |
#else |
| 43 |
bool IsFrodoSC = false; |
| 44 |
#endif |
| 45 |
|
| 46 |
|
| 47 |
/* |
| 48 |
* Constructor: Allocate objects and memory |
| 49 |
*/ |
| 50 |
|
| 51 |
C64::C64() |
| 52 |
{ |
| 53 |
uint8 *p; |
| 54 |
|
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// The thread is not yet running |
| 56 |
thread_running = false; |
| 57 |
quit_thyself = false; |
| 58 |
have_a_break = false; |
| 59 |
|
| 60 |
// System-dependent things |
| 61 |
c64_ctor1(); |
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|
| 63 |
// Open display |
| 64 |
TheDisplay = new C64Display(this); |
| 65 |
|
| 66 |
// Allocate RAM/ROM memory |
| 67 |
RAM = new uint8[C64_RAM_SIZE]; |
| 68 |
Basic = new uint8[BASIC_ROM_SIZE]; |
| 69 |
Kernal = new uint8[KERNAL_ROM_SIZE]; |
| 70 |
Char = new uint8[CHAR_ROM_SIZE]; |
| 71 |
Color = new uint8[COLOR_RAM_SIZE]; |
| 72 |
RAM1541 = new uint8[DRIVE_RAM_SIZE]; |
| 73 |
ROM1541 = new uint8[DRIVE_ROM_SIZE]; |
| 74 |
|
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// Create the chips |
| 76 |
TheCPU = new MOS6510(this, RAM, Basic, Kernal, Char, Color); |
| 77 |
|
| 78 |
TheJob1541 = new Job1541(RAM1541); |
| 79 |
TheCPU1541 = new MOS6502_1541(this, TheJob1541, TheDisplay, RAM1541, ROM1541); |
| 80 |
|
| 81 |
TheVIC = TheCPU->TheVIC = new MOS6569(this, TheDisplay, TheCPU, RAM, Char, Color); |
| 82 |
TheSID = TheCPU->TheSID = new MOS6581(this); |
| 83 |
TheCIA1 = TheCPU->TheCIA1 = new MOS6526_1(TheCPU, TheVIC); |
| 84 |
TheCIA2 = TheCPU->TheCIA2 = TheCPU1541->TheCIA2 = new MOS6526_2(TheCPU, TheVIC, TheCPU1541); |
| 85 |
TheIEC = TheCPU->TheIEC = new IEC(TheDisplay); |
| 86 |
TheREU = TheCPU->TheREU = new REU(TheCPU); |
| 87 |
|
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// Initialize RAM with powerup pattern |
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p = RAM; |
| 90 |
for (unsigned i=0; i<512; i++) { |
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for (unsigned j=0; j<64; j++) |
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*p++ = 0; |
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for (unsigned j=0; j<64; j++) |
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*p++ = 0xff; |
| 95 |
} |
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|
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// Initialize color RAM with random values |
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p = Color; |
| 99 |
for (unsigned i=0; i<COLOR_RAM_SIZE; i++) |
| 100 |
*p++ = rand() & 0x0f; |
| 101 |
|
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// Clear 1541 RAM |
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memset(RAM1541, 0, DRIVE_RAM_SIZE); |
| 104 |
|
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// Open joystick drivers if required |
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open_close_joysticks(0, 0, ThePrefs.Joystick1Port, ThePrefs.Joystick2Port); |
| 107 |
joykey = 0xff; |
| 108 |
|
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#ifdef FRODO_SC |
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CycleCounter = 0; |
| 111 |
#endif |
| 112 |
|
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// System-dependent things |
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c64_ctor2(); |
| 115 |
} |
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|
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|
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/* |
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* Destructor: Delete all objects |
| 120 |
*/ |
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|
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C64::~C64() |
| 123 |
{ |
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open_close_joysticks(ThePrefs.Joystick1Port, ThePrefs.Joystick2Port, 0, 0); |
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|
| 126 |
delete TheJob1541; |
| 127 |
delete TheREU; |
| 128 |
delete TheIEC; |
| 129 |
delete TheCIA2; |
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delete TheCIA1; |
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delete TheSID; |
| 132 |
delete TheVIC; |
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delete TheCPU1541; |
| 134 |
delete TheCPU; |
| 135 |
delete TheDisplay; |
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|
| 137 |
delete[] RAM; |
| 138 |
delete[] Basic; |
| 139 |
delete[] Kernal; |
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delete[] Char; |
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delete[] Color; |
| 142 |
delete[] RAM1541; |
| 143 |
delete[] ROM1541; |
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|
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c64_dtor(); |
| 146 |
} |
| 147 |
|
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|
| 149 |
/* |
| 150 |
* Reset C64 |
| 151 |
*/ |
| 152 |
|
| 153 |
void C64::Reset(void) |
| 154 |
{ |
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TheCPU->AsyncReset(); |
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TheCPU1541->AsyncReset(); |
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TheSID->Reset(); |
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TheCIA1->Reset(); |
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TheCIA2->Reset(); |
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TheIEC->Reset(); |
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} |
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|
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|
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/* |
| 165 |
* NMI C64 |
| 166 |
*/ |
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|
| 168 |
void C64::NMI(void) |
| 169 |
{ |
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TheCPU->AsyncNMI(); |
| 171 |
} |
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|
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|
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/* |
| 175 |
* The preferences have changed. prefs is a pointer to the new |
| 176 |
* preferences, ThePrefs still holds the previous ones. |
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* The emulation must be in the paused state! |
| 178 |
*/ |
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|
| 180 |
void C64::NewPrefs(Prefs *prefs) |
| 181 |
{ |
| 182 |
open_close_joysticks(ThePrefs.Joystick1Port, ThePrefs.Joystick2Port, prefs->Joystick1Port, prefs->Joystick2Port); |
| 183 |
PatchKernal(prefs->FastReset, prefs->Emul1541Proc); |
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|
| 185 |
TheDisplay->NewPrefs(prefs); |
| 186 |
|
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#ifdef __riscos__ |
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// Changed order of calls. If 1541 mode hasn't changed the order is insignificant. |
| 189 |
if (prefs->Emul1541Proc) { |
| 190 |
// New prefs have 1541 enabled ==> if old prefs had disabled free drives FIRST |
| 191 |
TheIEC->NewPrefs(prefs); |
| 192 |
TheJob1541->NewPrefs(prefs); |
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} else { |
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// New prefs has 1541 disabled ==> if old prefs had enabled free job FIRST |
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TheJob1541->NewPrefs(prefs); |
| 196 |
TheIEC->NewPrefs(prefs); |
| 197 |
} |
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#else |
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TheIEC->NewPrefs(prefs); |
| 200 |
TheJob1541->NewPrefs(prefs); |
| 201 |
#endif |
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|
| 203 |
TheREU->NewPrefs(prefs); |
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TheSID->NewPrefs(prefs); |
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|
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// Reset 1541 processor if turned on |
| 207 |
if (!ThePrefs.Emul1541Proc && prefs->Emul1541Proc) |
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TheCPU1541->AsyncReset(); |
| 209 |
} |
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|
| 211 |
|
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/* |
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* Patch kernal IEC routines |
| 214 |
*/ |
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|
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void C64::PatchKernal(bool fast_reset, bool emul_1541_proc) |
| 217 |
{ |
| 218 |
if (fast_reset) { |
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Kernal[0x1d84] = 0xa0; |
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Kernal[0x1d85] = 0x00; |
| 221 |
} else { |
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Kernal[0x1d84] = orig_kernal_1d84; |
| 223 |
Kernal[0x1d85] = orig_kernal_1d85; |
| 224 |
} |
| 225 |
|
| 226 |
if (emul_1541_proc) { |
| 227 |
Kernal[0x0d40] = 0x78; |
| 228 |
Kernal[0x0d41] = 0x20; |
| 229 |
Kernal[0x0d23] = 0x78; |
| 230 |
Kernal[0x0d24] = 0x20; |
| 231 |
Kernal[0x0d36] = 0x78; |
| 232 |
Kernal[0x0d37] = 0x20; |
| 233 |
Kernal[0x0e13] = 0x78; |
| 234 |
Kernal[0x0e14] = 0xa9; |
| 235 |
Kernal[0x0def] = 0x78; |
| 236 |
Kernal[0x0df0] = 0x20; |
| 237 |
Kernal[0x0dbe] = 0xad; |
| 238 |
Kernal[0x0dbf] = 0x00; |
| 239 |
Kernal[0x0dcc] = 0x78; |
| 240 |
Kernal[0x0dcd] = 0x20; |
| 241 |
Kernal[0x0e03] = 0x20; |
| 242 |
Kernal[0x0e04] = 0xbe; |
| 243 |
} else { |
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Kernal[0x0d40] = 0xf2; // IECOut |
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Kernal[0x0d41] = 0x00; |
| 246 |
Kernal[0x0d23] = 0xf2; // IECOutATN |
| 247 |
Kernal[0x0d24] = 0x01; |
| 248 |
Kernal[0x0d36] = 0xf2; // IECOutSec |
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Kernal[0x0d37] = 0x02; |
| 250 |
Kernal[0x0e13] = 0xf2; // IECIn |
| 251 |
Kernal[0x0e14] = 0x03; |
| 252 |
Kernal[0x0def] = 0xf2; // IECSetATN |
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Kernal[0x0df0] = 0x04; |
| 254 |
Kernal[0x0dbe] = 0xf2; // IECRelATN |
| 255 |
Kernal[0x0dbf] = 0x05; |
| 256 |
Kernal[0x0dcc] = 0xf2; // IECTurnaround |
| 257 |
Kernal[0x0dcd] = 0x06; |
| 258 |
Kernal[0x0e03] = 0xf2; // IECRelease |
| 259 |
Kernal[0x0e04] = 0x07; |
| 260 |
} |
| 261 |
|
| 262 |
// 1541 |
| 263 |
ROM1541[0x2ae4] = 0xea; // Don't check ROM checksum |
| 264 |
ROM1541[0x2ae5] = 0xea; |
| 265 |
ROM1541[0x2ae8] = 0xea; |
| 266 |
ROM1541[0x2ae9] = 0xea; |
| 267 |
ROM1541[0x2c9b] = 0xf2; // DOS idle loop |
| 268 |
ROM1541[0x2c9c] = 0x00; |
| 269 |
ROM1541[0x3594] = 0x20; // Write sector |
| 270 |
ROM1541[0x3595] = 0xf2; |
| 271 |
ROM1541[0x3596] = 0xf5; |
| 272 |
ROM1541[0x3597] = 0xf2; |
| 273 |
ROM1541[0x3598] = 0x01; |
| 274 |
ROM1541[0x3b0c] = 0xf2; // Format track |
| 275 |
ROM1541[0x3b0d] = 0x02; |
| 276 |
} |
| 277 |
|
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|
| 279 |
/* |
| 280 |
* Save RAM contents |
| 281 |
*/ |
| 282 |
|
| 283 |
void C64::SaveRAM(char *filename) |
| 284 |
{ |
| 285 |
FILE *f; |
| 286 |
|
| 287 |
if ((f = fopen(filename, "wb")) == NULL) |
| 288 |
ShowRequester("RAM save failed.", "OK", NULL); |
| 289 |
else { |
| 290 |
fwrite((void*)RAM, 1, 0x10000, f); |
| 291 |
fwrite((void*)Color, 1, 0x400, f); |
| 292 |
if (ThePrefs.Emul1541Proc) |
| 293 |
fwrite((void*)RAM1541, 1, 0x800, f); |
| 294 |
fclose(f); |
| 295 |
} |
| 296 |
} |
| 297 |
|
| 298 |
|
| 299 |
/* |
| 300 |
* Save CPU state to snapshot |
| 301 |
* |
| 302 |
* 0: Error |
| 303 |
* 1: OK |
| 304 |
* -1: Instruction not completed |
| 305 |
*/ |
| 306 |
|
| 307 |
int C64::SaveCPUState(FILE *f) |
| 308 |
{ |
| 309 |
MOS6510State state; |
| 310 |
TheCPU->GetState(&state); |
| 311 |
|
| 312 |
if (!state.instruction_complete) |
| 313 |
return -1; |
| 314 |
|
| 315 |
int i = fwrite(RAM, 0x10000, 1, f); |
| 316 |
i += fwrite(Color, 0x400, 1, f); |
| 317 |
i += fwrite((void*)&state, sizeof(state), 1, f); |
| 318 |
|
| 319 |
return i == 3; |
| 320 |
} |
| 321 |
|
| 322 |
|
| 323 |
/* |
| 324 |
* Load CPU state from snapshot |
| 325 |
*/ |
| 326 |
|
| 327 |
bool C64::LoadCPUState(FILE *f) |
| 328 |
{ |
| 329 |
MOS6510State state; |
| 330 |
|
| 331 |
int i = fread(RAM, 0x10000, 1, f); |
| 332 |
i += fread(Color, 0x400, 1, f); |
| 333 |
i += fread((void*)&state, sizeof(state), 1, f); |
| 334 |
|
| 335 |
if (i == 3) { |
| 336 |
TheCPU->SetState(&state); |
| 337 |
return true; |
| 338 |
} else |
| 339 |
return false; |
| 340 |
} |
| 341 |
|
| 342 |
|
| 343 |
/* |
| 344 |
* Save 1541 state to snapshot |
| 345 |
* |
| 346 |
* 0: Error |
| 347 |
* 1: OK |
| 348 |
* -1: Instruction not completed |
| 349 |
*/ |
| 350 |
|
| 351 |
int C64::Save1541State(FILE *f) |
| 352 |
{ |
| 353 |
MOS6502State state; |
| 354 |
TheCPU1541->GetState(&state); |
| 355 |
|
| 356 |
if (!state.idle && !state.instruction_complete) |
| 357 |
return -1; |
| 358 |
|
| 359 |
int i = fwrite(RAM1541, 0x800, 1, f); |
| 360 |
i += fwrite((void*)&state, sizeof(state), 1, f); |
| 361 |
|
| 362 |
return i == 2; |
| 363 |
} |
| 364 |
|
| 365 |
|
| 366 |
/* |
| 367 |
* Load 1541 state from snapshot |
| 368 |
*/ |
| 369 |
|
| 370 |
bool C64::Load1541State(FILE *f) |
| 371 |
{ |
| 372 |
MOS6502State state; |
| 373 |
|
| 374 |
int i = fread(RAM1541, 0x800, 1, f); |
| 375 |
i += fread((void*)&state, sizeof(state), 1, f); |
| 376 |
|
| 377 |
if (i == 2) { |
| 378 |
TheCPU1541->SetState(&state); |
| 379 |
return true; |
| 380 |
} else |
| 381 |
return false; |
| 382 |
} |
| 383 |
|
| 384 |
|
| 385 |
/* |
| 386 |
* Save VIC state to snapshot |
| 387 |
*/ |
| 388 |
|
| 389 |
bool C64::SaveVICState(FILE *f) |
| 390 |
{ |
| 391 |
MOS6569State state; |
| 392 |
TheVIC->GetState(&state); |
| 393 |
return fwrite((void*)&state, sizeof(state), 1, f) == 1; |
| 394 |
} |
| 395 |
|
| 396 |
|
| 397 |
/* |
| 398 |
* Load VIC state from snapshot |
| 399 |
*/ |
| 400 |
|
| 401 |
bool C64::LoadVICState(FILE *f) |
| 402 |
{ |
| 403 |
MOS6569State state; |
| 404 |
|
| 405 |
if (fread((void*)&state, sizeof(state), 1, f) == 1) { |
| 406 |
TheVIC->SetState(&state); |
| 407 |
return true; |
| 408 |
} else |
| 409 |
return false; |
| 410 |
} |
| 411 |
|
| 412 |
|
| 413 |
/* |
| 414 |
* Save SID state to snapshot |
| 415 |
*/ |
| 416 |
|
| 417 |
bool C64::SaveSIDState(FILE *f) |
| 418 |
{ |
| 419 |
MOS6581State state; |
| 420 |
TheSID->GetState(&state); |
| 421 |
return fwrite((void*)&state, sizeof(state), 1, f) == 1; |
| 422 |
} |
| 423 |
|
| 424 |
|
| 425 |
/* |
| 426 |
* Load SID state from snapshot |
| 427 |
*/ |
| 428 |
|
| 429 |
bool C64::LoadSIDState(FILE *f) |
| 430 |
{ |
| 431 |
MOS6581State state; |
| 432 |
|
| 433 |
if (fread((void*)&state, sizeof(state), 1, f) == 1) { |
| 434 |
TheSID->SetState(&state); |
| 435 |
return true; |
| 436 |
} else |
| 437 |
return false; |
| 438 |
} |
| 439 |
|
| 440 |
|
| 441 |
/* |
| 442 |
* Save CIA states to snapshot |
| 443 |
*/ |
| 444 |
|
| 445 |
bool C64::SaveCIAState(FILE *f) |
| 446 |
{ |
| 447 |
MOS6526State state; |
| 448 |
TheCIA1->GetState(&state); |
| 449 |
|
| 450 |
if (fwrite((void*)&state, sizeof(state), 1, f) == 1) { |
| 451 |
TheCIA2->GetState(&state); |
| 452 |
return fwrite((void*)&state, sizeof(state), 1, f) == 1; |
| 453 |
} else |
| 454 |
return false; |
| 455 |
} |
| 456 |
|
| 457 |
|
| 458 |
/* |
| 459 |
* Load CIA states from snapshot |
| 460 |
*/ |
| 461 |
|
| 462 |
bool C64::LoadCIAState(FILE *f) |
| 463 |
{ |
| 464 |
MOS6526State state; |
| 465 |
|
| 466 |
if (fread((void*)&state, sizeof(state), 1, f) == 1) { |
| 467 |
TheCIA1->SetState(&state); |
| 468 |
if (fread((void*)&state, sizeof(state), 1, f) == 1) { |
| 469 |
TheCIA2->SetState(&state); |
| 470 |
return true; |
| 471 |
} else |
| 472 |
return false; |
| 473 |
} else |
| 474 |
return false; |
| 475 |
} |
| 476 |
|
| 477 |
|
| 478 |
/* |
| 479 |
* Save 1541 GCR state to snapshot |
| 480 |
*/ |
| 481 |
|
| 482 |
bool C64::Save1541JobState(FILE *f) |
| 483 |
{ |
| 484 |
Job1541State state; |
| 485 |
TheJob1541->GetState(&state); |
| 486 |
return fwrite((void*)&state, sizeof(state), 1, f) == 1; |
| 487 |
} |
| 488 |
|
| 489 |
|
| 490 |
/* |
| 491 |
* Load 1541 GCR state from snapshot |
| 492 |
*/ |
| 493 |
|
| 494 |
bool C64::Load1541JobState(FILE *f) |
| 495 |
{ |
| 496 |
Job1541State state; |
| 497 |
|
| 498 |
if (fread((void*)&state, sizeof(state), 1, f) == 1) { |
| 499 |
TheJob1541->SetState(&state); |
| 500 |
return true; |
| 501 |
} else |
| 502 |
return false; |
| 503 |
} |
| 504 |
|
| 505 |
|
| 506 |
#define SNAPSHOT_HEADER "FrodoSnapshot" |
| 507 |
#define SNAPSHOT_1541 1 |
| 508 |
|
| 509 |
#define ADVANCE_CYCLES \ |
| 510 |
TheVIC->EmulateCycle(); \ |
| 511 |
TheCIA1->EmulateCycle(); \ |
| 512 |
TheCIA2->EmulateCycle(); \ |
| 513 |
TheCPU->EmulateCycle(); \ |
| 514 |
if (ThePrefs.Emul1541Proc) { \ |
| 515 |
TheCPU1541->CountVIATimers(1); \ |
| 516 |
if (!TheCPU1541->Idle) \ |
| 517 |
TheCPU1541->EmulateCycle(); \ |
| 518 |
} |
| 519 |
|
| 520 |
|
| 521 |
/* |
| 522 |
* Save snapshot (emulation must be paused and in VBlank) |
| 523 |
* |
| 524 |
* To be able to use SC snapshots with SL, SC snapshots are made thus that no |
| 525 |
* partially dealt with instructions are saved. Instead all devices are advanced |
| 526 |
* cycle by cycle until the current instruction has been finished. The number of |
| 527 |
* cycles this takes is saved in the snapshot and will be reconstructed if the |
| 528 |
* snapshot is loaded into FrodoSC again. |
| 529 |
*/ |
| 530 |
|
| 531 |
void C64::SaveSnapshot(char *filename) |
| 532 |
{ |
| 533 |
FILE *f; |
| 534 |
uint8 flags; |
| 535 |
uint8 delay; |
| 536 |
int stat; |
| 537 |
|
| 538 |
if ((f = fopen(filename, "wb")) == NULL) { |
| 539 |
ShowRequester("Unable to open snapshot file", "OK", NULL); |
| 540 |
return; |
| 541 |
} |
| 542 |
|
| 543 |
fprintf(f, "%s%c", SNAPSHOT_HEADER, 10); |
| 544 |
fputc(0, f); // Version number 0 |
| 545 |
flags = 0; |
| 546 |
if (ThePrefs.Emul1541Proc) |
| 547 |
flags |= SNAPSHOT_1541; |
| 548 |
fputc(flags, f); |
| 549 |
SaveVICState(f); |
| 550 |
SaveSIDState(f); |
| 551 |
SaveCIAState(f); |
| 552 |
|
| 553 |
#ifdef FRODO_SC |
| 554 |
delay = 0; |
| 555 |
do { |
| 556 |
if ((stat = SaveCPUState(f)) == -1) { // -1 -> Instruction not finished yet |
| 557 |
ADVANCE_CYCLES; // Advance everything by one cycle |
| 558 |
delay++; |
| 559 |
} |
| 560 |
} while (stat == -1); |
| 561 |
fputc(delay, f); // Number of cycles the saved CPUC64 lags behind the previous chips |
| 562 |
#else |
| 563 |
SaveCPUState(f); |
| 564 |
fputc(0, f); // No delay |
| 565 |
#endif |
| 566 |
|
| 567 |
if (ThePrefs.Emul1541Proc) { |
| 568 |
fwrite(ThePrefs.DrivePath[0], 256, 1, f); |
| 569 |
#ifdef FRODO_SC |
| 570 |
delay = 0; |
| 571 |
do { |
| 572 |
if ((stat = Save1541State(f)) == -1) { |
| 573 |
ADVANCE_CYCLES; |
| 574 |
delay++; |
| 575 |
} |
| 576 |
} while (stat == -1); |
| 577 |
fputc(delay, f); |
| 578 |
#else |
| 579 |
Save1541State(f); |
| 580 |
fputc(0, f); // No delay |
| 581 |
#endif |
| 582 |
Save1541JobState(f); |
| 583 |
} |
| 584 |
fclose(f); |
| 585 |
|
| 586 |
#ifdef __riscos__ |
| 587 |
TheWIMP->SnapshotSaved(true); |
| 588 |
#endif |
| 589 |
} |
| 590 |
|
| 591 |
|
| 592 |
/* |
| 593 |
* Load snapshot (emulation must be paused and in VBlank) |
| 594 |
*/ |
| 595 |
|
| 596 |
bool C64::LoadSnapshot(char *filename) |
| 597 |
{ |
| 598 |
FILE *f; |
| 599 |
|
| 600 |
if ((f = fopen(filename, "rb")) != NULL) { |
| 601 |
char Header[] = SNAPSHOT_HEADER; |
| 602 |
char *b = Header, c = 0; |
| 603 |
uint8 delay, i; |
| 604 |
|
| 605 |
// For some reason memcmp()/strcmp() and so forth utterly fail here. |
| 606 |
while (*b > 32) { |
| 607 |
if ((c = fgetc(f)) != *b++) { |
| 608 |
b = NULL; |
| 609 |
break; |
| 610 |
} |
| 611 |
} |
| 612 |
if (b != NULL) { |
| 613 |
uint8 flags; |
| 614 |
bool error = false; |
| 615 |
#ifndef FRODO_SC |
| 616 |
long vicptr; // File offset of VIC data |
| 617 |
#endif |
| 618 |
|
| 619 |
while (c != 10) |
| 620 |
c = fgetc(f); // Shouldn't be necessary |
| 621 |
if (fgetc(f) != 0) { |
| 622 |
ShowRequester("Unknown snapshot format", "OK", NULL); |
| 623 |
fclose(f); |
| 624 |
return false; |
| 625 |
} |
| 626 |
flags = fgetc(f); |
| 627 |
#ifndef FRODO_SC |
| 628 |
vicptr = ftell(f); |
| 629 |
#endif |
| 630 |
|
| 631 |
error |= !LoadVICState(f); |
| 632 |
error |= !LoadSIDState(f); |
| 633 |
error |= !LoadCIAState(f); |
| 634 |
error |= !LoadCPUState(f); |
| 635 |
|
| 636 |
delay = fgetc(f); // Number of cycles the 6510 is ahead of the previous chips |
| 637 |
#ifdef FRODO_SC |
| 638 |
// Make the other chips "catch up" with the 6510 |
| 639 |
for (i=0; i<delay; i++) { |
| 640 |
TheVIC->EmulateCycle(); |
| 641 |
TheCIA1->EmulateCycle(); |
| 642 |
TheCIA2->EmulateCycle(); |
| 643 |
} |
| 644 |
#endif |
| 645 |
if ((flags & SNAPSHOT_1541) != 0) { |
| 646 |
Prefs *prefs = new Prefs(ThePrefs); |
| 647 |
|
| 648 |
// First switch on emulation |
| 649 |
error |= (fread(prefs->DrivePath[0], 256, 1, f) != 1); |
| 650 |
prefs->Emul1541Proc = true; |
| 651 |
NewPrefs(prefs); |
| 652 |
ThePrefs = *prefs; |
| 653 |
delete prefs; |
| 654 |
|
| 655 |
// Then read the context |
| 656 |
error |= !Load1541State(f); |
| 657 |
|
| 658 |
delay = fgetc(f); // Number of cycles the 6502 is ahead of the previous chips |
| 659 |
#ifdef FRODO_SC |
| 660 |
// Make the other chips "catch up" with the 6502 |
| 661 |
for (i=0; i<delay; i++) { |
| 662 |
TheVIC->EmulateCycle(); |
| 663 |
TheCIA1->EmulateCycle(); |
| 664 |
TheCIA2->EmulateCycle(); |
| 665 |
TheCPU->EmulateCycle(); |
| 666 |
} |
| 667 |
#endif |
| 668 |
Load1541JobState(f); |
| 669 |
#ifdef __riscos__ |
| 670 |
TheWIMP->ThePrefsToWindow(); |
| 671 |
#endif |
| 672 |
} else if (ThePrefs.Emul1541Proc) { // No emulation in snapshot, but currently active? |
| 673 |
Prefs *prefs = new Prefs(ThePrefs); |
| 674 |
prefs->Emul1541Proc = false; |
| 675 |
NewPrefs(prefs); |
| 676 |
ThePrefs = *prefs; |
| 677 |
delete prefs; |
| 678 |
#ifdef __riscos__ |
| 679 |
TheWIMP->ThePrefsToWindow(); |
| 680 |
#endif |
| 681 |
} |
| 682 |
|
| 683 |
#ifndef FRODO_SC |
| 684 |
fseek(f, vicptr, SEEK_SET); |
| 685 |
LoadVICState(f); // Load VIC data twice in SL (is REALLY necessary sometimes!) |
| 686 |
#endif |
| 687 |
fclose(f); |
| 688 |
|
| 689 |
if (error) { |
| 690 |
ShowRequester("Error reading snapshot file", "OK", NULL); |
| 691 |
Reset(); |
| 692 |
return false; |
| 693 |
} else |
| 694 |
return true; |
| 695 |
} else { |
| 696 |
fclose(f); |
| 697 |
ShowRequester("Not a Frodo snapshot file", "OK", NULL); |
| 698 |
return false; |
| 699 |
} |
| 700 |
} else { |
| 701 |
ShowRequester("Can't open snapshot file", "OK", NULL); |
| 702 |
return false; |
| 703 |
} |
| 704 |
} |
| 705 |
|
| 706 |
|
| 707 |
#ifdef __BEOS__ |
| 708 |
#include "C64_Be.h" |
| 709 |
#endif |
| 710 |
|
| 711 |
#ifdef AMIGA |
| 712 |
#include "C64_Amiga.h" |
| 713 |
#endif |
| 714 |
|
| 715 |
#ifdef __unix |
| 716 |
#include "C64_x.h" |
| 717 |
#endif |
| 718 |
|
| 719 |
#ifdef __mac__ |
| 720 |
#include "C64_mac.h" |
| 721 |
#endif |
| 722 |
|
| 723 |
#ifdef WIN32 |
| 724 |
#include "C64_WIN32.h" |
| 725 |
#endif |
| 726 |
|
| 727 |
#ifdef __riscos__ |
| 728 |
#include "C64_Acorn.h" |
| 729 |
#endif |
