Shamusworld >> Repos - virtualjaguar/blob - src/jerry.cpp

   1 //
   2 // JERRY Core
   3 //
   4 // by cal2
   5 // GCC/SDL port by Niels Wagenaar (Linux/WIN32) and Caz (BeOS)
   6 // Cleanups by James L. Hammons
   7 //
   8 //      ------------------------------------------------------------
   9 //      JERRY REGISTERS (Mapped by Aaron Giles)
  10 //      ------------------------------------------------------------
  11 //      F10000-F13FFF   R/W   xxxxxxxx xxxxxxxx   Jerry
  12 //      F10000            W   xxxxxxxx xxxxxxxx   JPIT1 - timer 1 pre-scaler
  13 //      F10004            W   xxxxxxxx xxxxxxxx   JPIT2 - timer 1 divider
  14 //      F10008            W   xxxxxxxx xxxxxxxx   JPIT3 - timer 2 pre-scaler
  15 //      F1000C            W   xxxxxxxx xxxxxxxx   JPIT4 - timer 2 divider
  16 //      F10010            W   ------xx xxxxxxxx   CLK1 - processor clock divider
  17 //      F10012            W   ------xx xxxxxxxx   CLK2 - video clock divider
  18 //      F10014            W   -------- --xxxxxx   CLK3 - chroma clock divider
  19 //      F10020          R/W   ---xxxxx ---xxxxx   JINTCTRL - interrupt control register
  20 //                        W   ---x---- --------      (J_SYNCLR - clear synchronous serial intf ints)
  21 //                        W   ----x--- --------      (J_ASYNCLR - clear asynchronous serial intf ints)
  22 //                        W   -----x-- --------      (J_TIM2CLR - clear timer 2 [tempo] interrupts)
  23 //                        W   ------x- --------      (J_TIM1CLR - clear timer 1 [sample] interrupts)
  24 //                        W   -------x --------      (J_EXTCLR - clear external interrupts)
  25 //                      R/W   -------- ---x----      (J_SYNENA - enable synchronous serial intf ints)
  26 //                      R/W   -------- ----x---      (J_ASYNENA - enable asynchronous serial intf ints)
  27 //                      R/W   -------- -----x--      (J_TIM2ENA - enable timer 2 [tempo] interrupts)
  28 //                      R/W   -------- ------x-      (J_TIM1ENA - enable timer 1 [sample] interrupts)
  29 //                      R/W   -------- -------x      (J_EXTENA - enable external interrupts)
  30 //      F10030          R/W   -------- xxxxxxxx   ASIDATA - asynchronous serial data
  31 //      F10032            W   -x------ -xxxxxxx   ASICTRL - asynchronous serial control
  32 //                        W   -x------ --------      (TXBRK - transmit break)
  33 //                        W   -------- -x------      (CLRERR - clear error)
  34 //                        W   -------- --x-----      (RINTEN - enable receiver interrupts)
  35 //                        W   -------- ---x----      (TINTEN - enable transmitter interrupts)
  36 //                        W   -------- ----x---      (RXIPOL - receiver input polarity)
  37 //                        W   -------- -----x--      (TXOPOL - transmitter output polarity)
  38 //                        W   -------- ------x-      (PAREN - parity enable)
  39 //                        W   -------- -------x      (ODD - odd parity select)
  40 //      F10032          R     xxx-xxxx x-xxxxxx   ASISTAT - asynchronous serial status
  41 //                      R     x------- --------      (ERROR - OR of PE,FE,OE)
  42 //                      R     -x------ --------      (TXBRK - transmit break)
  43 //                      R     --x----- --------      (SERIN - serial input)
  44 //                      R     ----x--- --------      (OE - overrun error)
  45 //                      R     -----x-- --------      (FE - framing error)
  46 //                      R     ------x- --------      (PE - parity error)
  47 //                      R     -------x --------      (TBE - transmit buffer empty)
  48 //                      R     -------- x-------      (RBF - receive buffer full)
  49 //                      R     -------- ---x----      (TINTEN - enable transmitter interrupts)
  50 //                      R     -------- ----x---      (RXIPOL - receiver input polarity)
  51 //                      R     -------- -----x--      (TXOPOL - transmitter output polarity)
  52 //                      R     -------- ------x-      (PAREN - parity enable)
  53 //                      R     -------- -------x      (ODD - odd parity)
  54 //      F10034          R/W   xxxxxxxx xxxxxxxx   ASICLK - asynchronous serial interface clock
  55 //      ------------------------------------------------------------
  56 //      F14000-F17FFF   R/W   xxxxxxxx xxxxxxxx   Joysticks and GPIO0-5
  57 //      F14000          R     xxxxxxxx xxxxxxxx   JOYSTICK - read joystick state
  58 //      F14000            W   x------- xxxxxxxx   JOYSTICK - latch joystick output
  59 //                        W   x------- --------      (enable joystick outputs)
  60 //                        W   -------- xxxxxxxx      (joystick output data)
  61 //      F14002          R     xxxxxxxx xxxxxxxx   JOYBUTS - button register
  62 //      F14800-F14FFF   R/W   xxxxxxxx xxxxxxxx   GPI00 - reserved
  63 //      F15000-F15FFF   R/W   xxxxxxxx xxxxxxxx   GPI01 - reserved
  64 //      F16000-F16FFF   R/W   xxxxxxxx xxxxxxxx   GPI02 - reserved
  65 //      F17000-F177FF   R/W   xxxxxxxx xxxxxxxx   GPI03 - reserved
  66 //      F17800-F17BFF   R/W   xxxxxxxx xxxxxxxx   GPI04 - reserved
  67 //      F17C00-F17FFF   R/W   xxxxxxxx xxxxxxxx   GPI05 - reserved
  68 //      ------------------------------------------------------------
  69 //      F18000-F1FFFF   R/W   xxxxxxxx xxxxxxxx   Jerry DSP
  70 //      F1A100          R/W   xxxxxxxx xxxxxxxx   D_FLAGS - DSP flags register
  71 //                      R/W   x------- --------      (DMAEN - DMA enable)
  72 //                      R/W   -x------ --------      (REGPAGE - register page)
  73 //                        W   --x----- --------      (D_EXT0CLR - clear external interrupt 0)
  74 //                        W   ---x---- --------      (D_TIM2CLR - clear timer 2 interrupt)
  75 //                        W   ----x--- --------      (D_TIM1CLR - clear timer 1 interrupt)
  76 //                        W   -----x-- --------      (D_I2SCLR - clear I2S interrupt)
  77 //                        W   ------x- --------      (D_CPUCLR - clear CPU interrupt)
  78 //                      R/W   -------x --------      (D_EXT0ENA - enable external interrupt 0)
  79 //                      R/W   -------- x-------      (D_TIM2ENA - enable timer 2 interrupt)
  80 //                      R/W   -------- -x------      (D_TIM1ENA - enable timer 1 interrupt)
  81 //                      R/W   -------- --x-----      (D_I2SENA - enable I2S interrupt)
  82 //                      R/W   -------- ---x----      (D_CPUENA - enable CPU interrupt)
  83 //                      R/W   -------- ----x---      (IMASK - interrupt mask)
  84 //                      R/W   -------- -----x--      (NEGA_FLAG - ALU negative)
  85 //                      R/W   -------- ------x-      (CARRY_FLAG - ALU carry)
  86 //                      R/W   -------- -------x      (ZERO_FLAG - ALU zero)
  87 //      F1A102          R/W   -------- ------xx   D_FLAGS - upper DSP flags
  88 //                      R/W   -------- ------x-      (D_EXT1ENA - enable external interrupt 1)
  89 //                      R/W   -------- -------x      (D_EXT1CLR - clear external interrupt 1)
  90 //      F1A104            W   -------- ----xxxx   D_MTXC - matrix control register
  91 //                        W   -------- ----x---      (MATCOL - column/row major)
  92 //                        W   -------- -----xxx      (MATRIX3-15 - matrix width)
  93 //      F1A108            W   ----xxxx xxxxxx--   D_MTXA - matrix address register
  94 //      F1A10C            W   -------- -----x-x   D_END - data organization register
  95 //                        W   -------- -----x--      (BIG_INST - big endian instruction fetch)
  96 //                        W   -------- -------x      (BIG_IO - big endian I/O)
  97 //      F1A110          R/W   xxxxxxxx xxxxxxxx   D_PC - DSP program counter
  98 //      F1A114          R/W   xxxxxxxx xx-xxxxx   D_CTRL - DSP control/status register
  99 //                      R     xxxx---- --------      (VERSION - DSP version code)
 100 //                      R/W   ----x--- --------      (BUS_HOG - hog the bus!)
 101 //                      R/W   -----x-- --------      (D_EXT0LAT - external interrupt 0 latch)
 102 //                      R/W   ------x- --------      (D_TIM2LAT - timer 2 interrupt latch)
 103 //                      R/W   -------x --------      (D_TIM1LAT - timer 1 interrupt latch)
 104 //                      R/W   -------- x-------      (D_I2SLAT - I2S interrupt latch)
 105 //                      R/W   -------- -x------      (D_CPULAT - CPU interrupt latch)
 106 //                      R/W   -------- ---x----      (SINGLE_GO - single step one instruction)
 107 //                      R/W   -------- ----x---      (SINGLE_STEP - single step mode)
 108 //                      R/W   -------- -----x--      (FORCEINT0 - cause interrupt 0 on GPU)
 109 //                      R/W   -------- ------x-      (CPUINT - send GPU interrupt to CPU)
 110 //                      R/W   -------- -------x      (DSPGO - enable DSP execution)
 111 //      F1A116          R/W   -------- -------x   D_CTRL - upper DSP control/status register
 112 //                      R/W   -------- -------x      (D_EXT1LAT - external interrupt 1 latch)
 113 //      F1A118-F1A11B     W   xxxxxxxx xxxxxxxx   D_MOD - modulo instruction mask
 114 //      F1A11C-F1A11F   R     xxxxxxxx xxxxxxxx   D_REMAIN - divide unit remainder
 115 //      F1A11C            W   -------- -------x   D_DIVCTRL - divide unit control
 116 //                        W   -------- -------x      (DIV_OFFSET - 1=16.16 divide, 0=32-bit divide)
 117 //      F1A120-F1A123   R     xxxxxxxx xxxxxxxx   D_MACHI - multiply & accumulate high bits
 118 //      F1A148            W   xxxxxxxx xxxxxxxx   R_DAC - right transmit data
 119 //      F1A14C            W   xxxxxxxx xxxxxxxx   L_DAC - left transmit data
 120 //      F1A150            W   -------- xxxxxxxx   SCLK - serial clock frequency
 121 //      F1A150          R     -------- ------xx   SSTAT
 122 //                      R     -------- ------x-      (left - no description)
 123 //                      R     -------- -------x      (WS - word strobe status)
 124 //      F1A154            W   -------- --xxxx-x   SMODE - serial mode
 125 //                        W   -------- --x-----      (EVERYWORD - interrupt on MSB of every word)
 126 //                        W   -------- ---x----      (FALLING - interrupt on falling edge)
 127 //                        W   -------- ----x---      (RISING - interrupt of rising edge)
 128 //                        W   -------- -----x--      (WSEN - enable word strobes)
 129 //                        W   -------- -------x      (INTERNAL - enables serial clock)
 130 //      ------------------------------------------------------------
 131 //      F1B000-F1CFFF   R/W   xxxxxxxx xxxxxxxx   Local DSP RAM
 132 //      ------------------------------------------------------------
 133 //      F1D000          R     xxxxxxxx xxxxxxxx   ROM_TRI - triangle wave
 134 //      F1D200          R     xxxxxxxx xxxxxxxx   ROM_SINE - full sine wave
 135 //      F1D400          R     xxxxxxxx xxxxxxxx   ROM_AMSINE - amplitude modulated sine wave
 136 //      F1D600          R     xxxxxxxx xxxxxxxx   ROM_12W - sine wave and second order harmonic
 137 //      F1D800          R     xxxxxxxx xxxxxxxx   ROM_CHIRP16 - chirp
 138 //      F1DA00          R     xxxxxxxx xxxxxxxx   ROM_NTRI - traingle wave with noise
 139 //      F1DC00          R     xxxxxxxx xxxxxxxx   ROM_DELTA - spike
 140 //      F1DE00          R     xxxxxxxx xxxxxxxx   ROM_NOISE - white noise
 141 //      ------------------------------------------------------------
 142
 143 #include "jerry.h"
 144 #include "wavetable.h"
 145 #include <math.h>
 146
 147 //#define JERRY_DEBUG
 148
 149 static uint8 * jerry_ram_8;
 150
 151 #define JERRY_CONFIG    0x4002
 152
 153 uint8 analog_x, analog_y;
 154
 155 static uint32 jerry_timer_1_prescaler;
 156 static uint32 jerry_timer_2_prescaler;
 157 static uint32 jerry_timer_1_divider;
 158 static uint32 jerry_timer_2_divider;
 159 static int32 jerry_timer_1_counter;
 160 static int32 jerry_timer_2_counter;
 161
 162 static uint32 jerry_i2s_interrupt_divide = 8;
 163 static int32 jerry_i2s_interrupt_timer = -1;
 164 uint32 jerryI2SCycles;
 165 uint32 jerryIntPending;
 166
 167 //This approach is probably wrong, since the timer is continuously counting down, though
 168 //it might only be a problem if the # of interrupts generated is greater than 1--the M68K's
 169 //timeslice should be running during that phase... (The DSP needs to be aware of this!)
 170 void jerry_i2s_exec(uint32 cycles)
 171 {
 172         extern uint16 serialMode;                                               // From DAC.CPP
 173         if (!(serialMode & 0x01))                                               // INTERNAL flag
 174                 return;
 175
 176         // Why is it called this? Instead of SCLK? Shouldn't this be read from DAC.CPP???
 177 //Yes, it should. !!! FIX !!!
 178         jerry_i2s_interrupt_divide &= 0xFF;
 179
 180         if (jerry_i2s_interrupt_timer == -1)
 181         {
 182                 // We don't have to divide the RISC clock rate by this--the reason is a bit
 183                 // convoluted. Will put explanation here later...
 184 // What's needed here is to find the ratio of the frequency to the number of clock cycles
 185 // in one second. For example, if the sample rate is 44100, we divide the clock rate by
 186 // this: 26590906 / 44100 = 602 cycles.
 187 // Which means, every 602 cycles that go by we have to generate an interrupt.
 188                 jerryI2SCycles = 32 * (2 * (jerry_i2s_interrupt_divide + 1));
 189         }
 190
 191         jerry_i2s_interrupt_timer -= cycles;
 192         if (jerry_i2s_interrupt_timer <= 0)
 193         {
 194                 DSPSetIRQLine(DSPIRQ_SSI, ASSERT_LINE);
 195                 jerry_i2s_interrupt_timer += jerryI2SCycles;
 196                 if (jerry_i2s_interrupt_timer < 0)
 197                         WriteLog("JERRY: Missed generating an interrupt (missed %u)!\n", (-jerry_i2s_interrupt_timer / jerryI2SCycles) + 1);
 198         }
 199 }
 200
 201 void jerry_reset_i2s_timer(void)
 202 {
 203         //WriteLog("i2s: reseting\n");
 204 //This is really SCLK... !!! FIX !!!
 205         jerry_i2s_interrupt_divide = 8;
 206         jerry_i2s_interrupt_timer = -1;
 207 }
 208
 209 void jerry_reset_timer_1(void)
 210 {
 211         if (!jerry_timer_1_prescaler || !jerry_timer_1_divider)
 212                 jerry_timer_1_counter = 0;
 213         else
 214                 jerry_timer_1_counter = (1 + jerry_timer_1_prescaler) * (1 + jerry_timer_1_divider);
 215
 216 //      if (jerry_timer_1_counter)
 217 //              WriteLog("jerry: reseting timer 1 to 0x%.8x (%i)\n",jerry_timer_1_counter,jerry_timer_1_counter);
 218 }
 219
 220 void jerry_reset_timer_2(void)
 221 {
 222         if (!jerry_timer_2_prescaler || !jerry_timer_2_divider)
 223         {
 224                 jerry_timer_2_counter = 0;
 225                 return;
 226         }
 227         else
 228                 jerry_timer_2_counter = ((1 + jerry_timer_2_prescaler) * (1 + jerry_timer_2_divider));
 229
 230 //      if (jerry_timer_2_counter)
 231 //              WriteLog("jerry: reseting timer 2 to 0x%.8x (%i)\n",jerry_timer_2_counter,jerry_timer_2_counter);
 232 }
 233
 234 void jerry_pit_exec(uint32 cycles)
 235 {
 236         if (jerry_timer_1_counter)
 237                 jerry_timer_1_counter -= cycles;
 238
 239         if (jerry_timer_1_counter <= 0)
 240         {
 241                 DSPSetIRQLine(DSPIRQ_TIMER0, ASSERT_LINE);
 242                 jerry_reset_timer_1();
 243         }
 244
 245         if (jerry_timer_2_counter)
 246                 jerry_timer_2_counter -= cycles;
 247
 248         if (jerry_timer_2_counter <= 0)
 249         {
 250                 DSPSetIRQLine(DSPIRQ_TIMER1, ASSERT_LINE);
 251                 jerry_reset_timer_2();
 252         }
 253 }
 254
 255 void jerry_init(void)
 256 {
 257         clock_init();
 258         anajoy_init();
 259         joystick_init();
 260         DACInit();
 261 //This should be handled with the cart initialization...
 262 //      eeprom_init();
 263         memory_malloc_secure((void **)&jerry_ram_8, 0x10000, "JERRY RAM/ROM");
 264         memcpy(&jerry_ram_8[0xD000], wave_table, 0x1000);
 265 }
 266
 267 void jerry_reset(void)
 268 {
 269         clock_reset();
 270         anajoy_reset();
 271         joystick_reset();
 272         eeprom_reset();
 273         jerry_reset_i2s_timer();
 274         DACReset();
 275
 276         memset(jerry_ram_8, 0x00, 0xD000);              // Don't clear out the Wavetable ROM...!
 277         jerry_timer_1_prescaler = 0xFFFF;
 278         jerry_timer_2_prescaler = 0xFFFF;
 279         jerry_timer_1_divider = 0xFFFF;
 280         jerry_timer_2_divider = 0xFFFF;
 281         jerry_timer_1_counter = 0;
 282         jerry_timer_2_counter = 0;
 283 }
 284
 285 void jerry_done(void)
 286 {
 287         WriteLog("JERRY: M68K Interrupt control ($F10020) = %04X\n", GET16(jerry_ram_8, 0x20));
 288         memory_free(jerry_ram_8);
 289         clock_done();
 290         anajoy_done();
 291         joystick_done();
 292         DACDone();
 293         eeprom_done();
 294 }
 295
 296 bool JERRYIRQEnabled(int irq)
 297 {
 298         // Read the word @ $F10020
 299         return jerry_ram_8[0x21] & (1 << irq);
 300 }
 301
 302 void JERRYSetPendingIRQ(int irq)
 303 {
 304         // This is the shadow of INT (it's a split RO/WO register)
 305         jerryIntPending |= (1 << irq);
 306 }
 307
 308 //
 309 // JERRY byte access (read)
 310 //
 311 uint8 JERRYReadByte(uint32 offset, uint32 who/*=UNKNOWN*/)
 312 {
 313 #ifdef JERRY_DEBUG
 314         WriteLog("JERRY: Reading byte at %06X\n", offset);
 315 #endif
 316         if ((offset >= DSP_CONTROL_RAM_BASE) && (offset < DSP_CONTROL_RAM_BASE+0x20))
 317                 return DSPReadByte(offset, who);
 318         else if ((offset >= DSP_WORK_RAM_BASE) && (offset < DSP_WORK_RAM_BASE+0x2000))
 319                 return DSPReadByte(offset, who);
 320         else if (offset >= 0xF10000 && offset <= 0xF10007)
 321         {
 322                 switch(offset & 0x07)
 323                 {
 324                 case 0:
 325                         return jerry_timer_1_prescaler >> 8;
 326                 case 1:
 327                         return jerry_timer_1_prescaler & 0xFF;
 328                 case 2:
 329                         return jerry_timer_1_divider >> 8;
 330                 case 3:
 331                         return jerry_timer_1_divider & 0xFF;
 332                 case 4:
 333                         return jerry_timer_2_prescaler >> 8;
 334                 case 5:
 335                         return jerry_timer_2_prescaler & 0xFF;
 336                 case 6:
 337                         return jerry_timer_2_divider >> 8;
 338                 case 7:
 339                         return jerry_timer_2_divider & 0xFF;
 340                 }
 341         }
 342         else if (offset >= 0xF10010 && offset <= 0xF10015)
 343                 return clock_byte_read(offset);
 344         else if (offset >= 0xF17C00 && offset <= 0xF17C01)
 345                 return anajoy_byte_read(offset);
 346         else if (offset >= 0xF14000 && offset <= 0xF14003)
 347         {
 348                 return joystick_byte_read(offset) | eeprom_byte_read(offset);
 349         }
 350         else if (offset >= 0xF14000 && offset <= 0xF1A0FF)
 351                 return eeprom_byte_read(offset);
 352
 353         return jerry_ram_8[offset & 0xFFFF];
 354 }
 355
 356 //
 357 // JERRY word access (read)
 358 //
 359 uint16 JERRYReadWord(uint32 offset, uint32 who/*=UNKNOWN*/)
 360 {
 361 #ifdef JERRY_DEBUG
 362         WriteLog("JERRY: Reading word at %06X\n", offset);
 363 #endif
 364
 365         if ((offset >= DSP_CONTROL_RAM_BASE) && (offset < DSP_CONTROL_RAM_BASE+0x20))
 366                 return DSPReadWord(offset, who);
 367         else if (offset >= DSP_WORK_RAM_BASE && offset <= DSP_WORK_RAM_BASE + 0x1FFF)
 368                 return DSPReadWord(offset, who);
 369         else if ((offset >= 0xF10000) && (offset <= 0xF10007))
 370         {
 371                 switch(offset & 0x07)
 372                 {
 373                 case 0:
 374                         return jerry_timer_1_prescaler;
 375                 case 2:
 376                         return jerry_timer_1_divider;
 377                 case 4:
 378                         return jerry_timer_2_prescaler;
 379                 case 6:
 380                         return jerry_timer_2_divider;
 381                 }
 382                 // Unaligned word reads???
 383         }
 384         else if ((offset >= 0xF10010) && (offset <= 0xF10015))
 385                 return clock_word_read(offset);
 386         else if (offset == 0xF10020)
 387                 return jerryIntPending;
 388         else if ((offset >= 0xF17C00) && (offset <= 0xF17C01))
 389                 return anajoy_word_read(offset);
 390         else if (offset == 0xF14000)
 391         {
 392                 //WriteLog("reading 0x%.4x from 0xf14000\n");
 393                 return (joystick_word_read(offset) & 0xFFFE) | eeprom_word_read(offset);
 394         }
 395         else if ((offset >= 0xF14002) && (offset < 0xF14003))
 396                 return joystick_word_read(offset);
 397         else if ((offset >= 0xF14000) && (offset <= 0xF1A0FF))
 398                 return eeprom_word_read(offset);
 399
 400 /*if (offset >= 0xF1D000)
 401         WriteLog("JERRY: Reading word at %08X [%04X]...\n", offset, ((uint16)jerry_ram_8[(offset+0)&0xFFFF] << 8) | jerry_ram_8[(offset+1)&0xFFFF]);//*/
 402
 403         offset &= 0xFFFF;                               // Prevent crashing...!
 404         return ((uint16)jerry_ram_8[offset+0] << 8) | jerry_ram_8[offset+1];
 405 }
 406
 407 //
 408 // JERRY byte access (write)
 409 //
 410 void JERRYWriteByte(uint32 offset, uint8 data, uint32 who/*=UNKNOWN*/)
 411 {
 412 #ifdef JERRY_DEBUG
 413         WriteLog("jerry: writing byte %.2x at 0x%.6x\n",data,offset);
 414 #endif
 415         if ((offset >= DSP_CONTROL_RAM_BASE) && (offset < DSP_CONTROL_RAM_BASE+0x20))
 416         {
 417                 DSPWriteByte(offset, data, who);
 418                 return;
 419         }
 420         else if ((offset >= DSP_WORK_RAM_BASE) && (offset < DSP_WORK_RAM_BASE+0x2000))
 421         {
 422                 DSPWriteByte(offset, data, who);
 423                 return;
 424         }
 425         // SCLK ($F1A150--8 bits wide)
 426         else if ((offset >= 0xF1A152) && (offset <= 0xF1A153))
 427         {
 428 //              WriteLog("JERRY: Writing %02X to SCLK...\n", data);
 429                 if ((offset & 0x03) == 2)
 430                         jerry_i2s_interrupt_divide = (jerry_i2s_interrupt_divide & 0x00FF) | ((uint32)data << 8);
 431                 else
 432                         jerry_i2s_interrupt_divide = (jerry_i2s_interrupt_divide & 0xFF00) | (uint32)data;
 433
 434                 jerry_i2s_interrupt_timer = -1;
 435                 jerry_i2s_exec(0);
 436 //              return;
 437         }
 438         // LTXD/RTXD/SCLK/SMODE $F1A148/4C/50/54 (really 16-bit registers...)
 439         else if (offset >= 0xF1A148 && offset <= 0xF1A157)
 440         {
 441                 DACWriteByte(offset, data);
 442                 return;
 443         }
 444         else if (offset >= 0xF10000 && offset <= 0xF10007)
 445         {
 446                 switch (offset & 0x07)
 447                 {
 448                 case 0:
 449                         jerry_timer_1_prescaler = (jerry_timer_1_prescaler & 0x00FF) | (data << 8);
 450                         jerry_reset_timer_1();
 451                         break;
 452                 case 1:
 453                         jerry_timer_1_prescaler = (jerry_timer_1_prescaler & 0xFF00) | (data);
 454                         jerry_reset_timer_1();
 455                         break;
 456                 case 2: { jerry_timer_1_divider=(jerry_timer_1_divider&0x00ff)|(data<<8);               jerry_reset_timer_1(); return; }
 457                 case 3: { jerry_timer_1_divider=(jerry_timer_1_divider&0xff00)|(data);                  jerry_reset_timer_1(); return; }
 458                 case 4: { jerry_timer_2_prescaler=(jerry_timer_2_prescaler&0x00ff)|(data<<8);   jerry_reset_timer_2(); return; }
 459                 case 5: { jerry_timer_2_prescaler=(jerry_timer_2_prescaler&0xff00)|(data);              jerry_reset_timer_2(); return; }
 460                 case 6: { jerry_timer_2_divider=(jerry_timer_2_divider&0x00ff)|(data<<8);               jerry_reset_timer_2(); return; }
 461                 case 7: { jerry_timer_2_divider=(jerry_timer_2_divider&0xff00)|(data);                  jerry_reset_timer_2(); return; }
 462                 }
 463                 return;
 464         }
 465         else if ((offset >= 0xF10010) && (offset <= 0xF10015))
 466         {
 467                 clock_byte_write(offset, data);
 468                 return;
 469         }
 470         else if ((offset >= 0xF17C00) && (offset <= 0xF17C01))
 471         {
 472                 anajoy_byte_write(offset, data);
 473                 return;
 474         }
 475         else if ((offset >= 0xF14000) && (offset <= 0xF14003))
 476         {
 477                 joystick_byte_write(offset, data);
 478                 eeprom_byte_write(offset, data);
 479                 return;
 480         }
 481         else if ((offset >= 0xF14000) && (offset <= 0xF1A0FF))
 482         {
 483                 eeprom_byte_write(offset, data);
 484                 return;
 485         }
 486
 487 //Need to protect write attempts to Wavetable ROM (F1D000-FFF)
 488         if (offset >= 0xF1D000 && offset <= 0xF1DFFF)
 489                 return;
 490
 491         jerry_ram_8[offset & 0xFFFF] = data;
 492 }
 493
 494 //
 495 // JERRY word access (write)
 496 //
 497 void JERRYWriteWord(uint32 offset, uint16 data, uint32 who/*=UNKNOWN*/)
 498 {
 499 #ifdef JERRY_DEBUG
 500         WriteLog( "JERRY: Writing word %04X at %06X\n", data, offset);
 501 #endif
 502
 503         if ((offset >= DSP_CONTROL_RAM_BASE) && (offset < DSP_CONTROL_RAM_BASE+0x20))
 504         {
 505                 DSPWriteWord(offset, data, who);
 506                 return;
 507         }
 508         else if ((offset >= DSP_WORK_RAM_BASE) && (offset < DSP_WORK_RAM_BASE+0x2000))
 509         {
 510                 DSPWriteWord(offset, data, who);
 511                 return;
 512         }
 513         else if (offset == 0xF1A152)                                    // Bottom half of SCLK ($F1A150)
 514         {
 515                 WriteLog("JERRY: Writing %04X to SCLK (by %s)...\n", data, whoName[who]);
 516                 jerry_i2s_interrupt_divide = (uint8)data;
 517                 jerry_i2s_interrupt_timer = -1;
 518                 jerry_i2s_exec(0);
 519
 520                 DACWriteWord(offset, data);
 521                 return;
 522         }
 523         // LTXD/RTXD/SCLK/SMODE $F1A148/4C/50/54 (really 16-bit registers...)
 524         else if (offset >= 0xF1A148 && offset <= 0xF1A156)
 525         {
 526                 DACWriteWord(offset, data);
 527                 return;
 528         }
 529         else if ((offset >= 0xF10000) && (offset <= 0xF10007))
 530         {
 531                 switch(offset & 0x07)
 532                 {
 533                 case 0:
 534                         jerry_timer_1_prescaler = data;
 535                         jerry_reset_timer_1();
 536                         break;
 537                 case 2:
 538                         jerry_timer_1_divider = data;
 539                         jerry_reset_timer_1();
 540                         break;
 541                 case 4:
 542                         jerry_timer_2_prescaler = data;
 543                         jerry_reset_timer_2();
 544                         break;
 545                 case 6:
 546                         jerry_timer_2_divider = data;
 547                         jerry_reset_timer_2();
 548                 }
 549                 // Need to handle (unaligned) cases???
 550                 return;
 551         }
 552         else if ((offset >= 0xF10010) && (offset < 0xF10016))
 553         {
 554                 clock_word_write(offset, data);
 555                 return;
 556         }
 557         // JERRY -> 68K interrupt enables/latches (need to be handled!)
 558         else if (offset >= 0xF10020 && offset <= 0xF10022)
 559         {
 560         }
 561         else if ((offset >= 0xF17C00) && (offset < 0xF17C02))
 562         {
 563 //I think this was removed from the Jaguar. If so, then we don't need this...!
 564                 anajoy_word_write(offset, data);
 565                 return;
 566         }
 567         else if ((offset >= 0xF14000) && (offset < 0xF14003))
 568         {
 569                 joystick_word_write(offset, data);
 570                 eeprom_word_write(offset, data);
 571                 return;
 572         }
 573         else if ((offset >= 0xF14000) && (offset <= 0xF1A0FF))
 574         {
 575                 eeprom_word_write(offset, data);
 576                 return;
 577         }
 578
 579 //Need to protect write attempts to Wavetable ROM (F1D000-FFF)
 580         if (offset >= 0xF1D000 && offset <= 0xF1DFFF)
 581                 return;
 582
 583         jerry_ram_8[(offset+0) & 0xFFFF] = (data >> 8) & 0xFF;
 584         jerry_ram_8[(offset+1) & 0xFFFF] = data & 0xFF;
 585 }