[Core/CD] incremented CD_PLAY status delay by one CDD interrupt (fixes regression freeze in Annet Futatabi introduced by previous change)

HISTORY.txt

@@ -13,6 +13,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
 [Core/CD]
 ---------------
 * added CD-AUDIO & CD+G support
+* added CD-ROM Mode 2 (Form 1 & 2) support (Wonder Library)
 * added optional support for external VORBIS library
 * added optional CHD file support
 * added CDC & GFX register polling detection / synchronization
@@ -39,6 +40,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
 * fixed access to Sub-CPU "read-only" communication registers (fixes Round 5 Boss freeze in Streets of Rage / Sega Classics Arcade Collection)
 * fixed pending level 1 interrupts when GFX interrupt is disabled (fixes random freezes when exiting "Batman Returns" option menu)
 * fixed CDD seek command again (Final Fight CD freeze with model 2 BIOS)
+* fixed CDD status reported during seek/access time (sound effect synchronization issue in Bari Arm)
 * optimized Sub-CPU / Main-CPU synchronization
 
 [Core/MD]
@@ -66,6 +68,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
 * improved emulation accuracy of Japanese Master System I/O chip (315-5297)
 * fixed Boot ROM loading when switching system hardware
 * fixed 4MB ROM support
+* fixed savestate support when using Boot ROM
 
 [Core/GG]
 ---------------
@@ -77,13 +80,16 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
 * added support for new SMS Power Korean dumps (Star Soldier & Pippols)
 * added support for SG-1000 II clone hardware (2KB RAM + integrated VDP/PSG chip 315-5066)
 * fixed SG-1000 internal RAM size (1KB instead of 2KB)
+* fixed savestates for games using external RAM
 * restored SG-1000 Pause button support
 
 [Core/CPU]
 ---------------
+* added Z80 wait-states on 68k bus access (fixes Remute Red Eyes demo)
 * improved 68k auto-vectored interrupts acknowledge cycle timing accuracy (Bubsy background color corruption during cutscenes)
 * fixed 68k undocumented behaviors for ABCD/SBCD/NBCD instructions (thanks to Flamewing for his test ROM)
 * fixed 68k timing of BTST Dn,#Imm instruction (verified by Flamewing in original microcode)
+* fixed 68K DIVU instruction timings for SUB-CPU
 * fixed Z80 interrupt duration (Bomb on Basic City music running too fast)
 * fixed Z80 SP register initialization on power-on for Master System & Game Gear 
  (Ace of Aces, Shadow Dancer, Ecco the Dolphin, Evander Holyfield Real Deal Boxing)
@@ -127,6 +133,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
 * replaced configurable YM2612 DAC quantization by configurable YM2612 chip model emulation (discrete, ASIC-integrated or enhanced)
 * added DAC distortion emulation for discrete YM2612 chip model
 * added accurate status & BUSY flag emulation for discrete and ASIC-integrated YM2612 chip models (verified on real hardware)
+* added optional support for cycle-accurate YM3438/YM2612 & YM2413 cores from Nuked
 * improved 9-bit DAC quantization accuracy for discrete and ASIC-integrated YM2612 chip models (verified on YM2612 die)
 * rewrote optimized & more accurate PSG core from scratch
 * removed PSG boost noise feature & added optional high-quality PSG resampling

core/cd_hw/cdd.c

@@ -1791,8 +1791,8 @@ void cdd_process(void)
     {
       /* RS0-RS8 are normally unchanged unless reported drive status needs to be updated (i.e previous drive command has been processed) */
       /* Note: this function is called one 75hz frame ahead of CDD update so latency counter is always one step ahead of upcoming status */
-      /* Also, Radical Rex needs at least two interrupts with 'playing' status returned before sectors start getting incremented */
-      if (cdd.latency <= 2)
+      /* Radical Rex and Annet Futatabi both need at least respectively 2 and 3 interrupts with 'playing' status returned before sectors start getting incremented */
+      if (cdd.latency <= 3)
       {
         /* update reported drive status */
         scd.regs[0x38>>1].byte.h = cdd.status;
@@ -1932,7 +1932,7 @@ void cdd_process(void)
       if (!cdd.latency)
       {
         /* Fixes a few games hanging because they expect data to be read with some delay */
-        /* Wolf Team games (Anet Futatabi, Aisle Lord, Cobra Command, Earnest Evans, Road Avenger & Time Gal) need at least 11 interrupts delay  */
+        /* Wolf Team games (Annet Futatabi, Aisle Lord, Cobra Command, Earnest Evans, Road Avenger & Time Gal) need at least 11 interrupts delay  */
         /* Space Adventure Cobra (2nd morgue scene) needs at least 13 interrupts delay (incl. seek time, so 11 is OK) */
         cdd.latency = 11;
       }