n64: Simulation of cpu cycles that would be used during the skipped RDRAM initialization. This allows the initialization of the SI to see a closer to expected system uptime when requested.

src/devices/cpu/mips/mips3.c

@@ -2701,6 +2701,11 @@ void mips3_device::handle_special(UINT32 op)
 	}
 }
 
+void mips3_device::burn_cycles(INT32 cycles)
+{
+	execute_burn(cycles);
+}
+
 void mips3_device::execute_run()
 {
 	if (m_isdrc)

src/devices/cpu/mips/mips3.h

@@ -300,6 +300,7 @@ public:
 	void clear_fastram(UINT32 select_start);
 	void mips3drc_set_options(UINT32 options);
 	void mips3drc_add_hotspot(offs_t pc, UINT32 opcode, UINT32 cycles);
+	void burn_cycles(INT32 cycles);
 	
 protected:
 	// device-level overrides
@@ -313,6 +314,7 @@ protected:
 	virtual UINT32 execute_input_lines() const { return 6; }
 	virtual void execute_run();
 	virtual void execute_set_input(int inputnum, int state);
+	virtual void execute_burn(INT32 cycles) { m_totalcycles += cycles; }
 
 	// device_memory_interface overrides
 	virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const { return (spacenum == AS_PROGRAM) ? &m_program_config : NULL; }

src/mame/machine/n64.c

@@ -1667,6 +1667,20 @@ WRITE32_MEMBER( n64_periphs::pi_reg_w )
 
 READ32_MEMBER( n64_periphs::ri_reg_r )
 {
+	if(offset == 0x0C/4) // RI_SELECT
+	{
+		/* This is to 'simulate' the time that RDRAM initialization 
+		would take if the RI registers were not set to skip the RDRAM
+		testing during device reset.  Proper simulation would require
+		emulating the RDRAM modules and bus stalls for the mips cpu. 
+		The cycle amount chosen represents 1/2 second, which is not
+		necessarily the time for RDRAM initialization, but rather the
+		time recommended for letting the SI devices settle after startup.
+		This allows the initialization routines for the SI to see that a
+		proper amount of time has passed since system startup. */
+		machine().device<mips3_device>("maincpu")->burn_cycles(93750000/2);
+	}
+
 	if(offset > 0x1c/4)
 	{
 		logerror("ri_reg_r: %08X, %08X at %08X\n", offset, mem_mask, maincpu->safe_pc());

src/mame/mess.lst

@@ -61,18 +61,18 @@ sf7000  // Sega SC-3000 w/ SF-7000 (Japan)
 omv1000   // Tsukuda Original Othello Multivision FG-1000
 omv2000   // Tsukuda Original Othello Multivision FG-2000
 
-gamegear  // Sega GameGear
+//gamegear  // Sega GameGear
-gamegeaj  // Sega GameGear (Japan)
+//gamegeaj  // Sega GameGear (Japan)
-sms    // Sega Master System II (NTSC)
+//sms    // Sega Master System II (NTSC)
-sms1      // Sega Master System I (NTSC)
+//sms1      // Sega Master System I (NTSC)
-sms1pal   // Sega Master System I (PAL)
+//sms1pal   // Sega Master System I (PAL)
-smspal  // Sega Master System II (PAL)
+//smspal  // Sega Master System II (PAL)
-smsj      // Sega Master System (Japan) with FM Chip
+//smsj      // Sega Master System (Japan) with FM Chip
-sg1000m3  // Sega SG-1000 Mark III (Japan)
+//sg1000m3  // Sega SG-1000 Mark III (Japan)
-sms1krfm  // Samsung Gam*Boy I (Korea) with FM Chip
+//sms1krfm  // Samsung Gam*Boy I (Korea) with FM Chip
-sms1kr  // Samsung Gam*Boy I (Korea)
+//sms1kr  // Samsung Gam*Boy I (Korea)
-smskr  // Samsung Gam*Boy II (Korea)
+//smskr  // Samsung Gam*Boy II (Korea)
-smssdisp  // Sega Master System Store Display Unit
+//smssdisp  // Sega Master System Store Display Unit
 
 megadrij  // 1988 Sega Mega Drive (Japan)
 genesis   // 1989 Sega Genesis (USA)
@@ -117,7 +117,7 @@ dceu      // 1999 Sega Dreamcast (Europe)
 dcdev    // 1998 Sega HKT-0120 Sega Dreamcast Development Box
 dcprt    // 1998 Sega Katana Set 5 Prototype
 
-svmu     // 1998 Sega Visual Memory Unit
+//svmu     // 1998 Sega Visual Memory Unit
 
 // Sony
 psj    // 1994 Sony PlayStation (Japan)
@@ -385,7 +385,7 @@ f1
 f1e
 f2
 f10
-fp
+//fp
 
 // Cambridge Computers
 z88      // Z88 (UK)
@@ -661,22 +661,22 @@ c64gs    // Commodore 64 Games System
 c64dtv   // Commodore 64 Direct-to-TV
 clcd      // Commodore LCD
 
-b500      // Commodore B500
+//b500      // Commodore B500
-b128      // Commodore B128
+//b128      // Commodore B128
-b256      // Commodore B256
+//b256      // Commodore B256
-cbm610  // Commodore CBM 610
+//cbm610  // Commodore CBM 610
-cbm620  // Commodore CBM 620
+//cbm620  // Commodore CBM 620
-cbm620_hu  // Commodore CBM 620 (Hungary)
+//cbm620_hu  // Commodore CBM 620 (Hungary)
-b128hp  // Commodore B128HP
+//b128hp  // Commodore B128HP
-b256hp  // Commodore B256HP
+//b256hp  // Commodore B256HP
-bx256hp   // Commodore BX256HP
+//bx256hp   // Commodore BX256HP
-cbm710  // Commodore CBM 710
+//cbm710  // Commodore CBM 710
-cbm720  // Commodore CBM 720
+//cbm720  // Commodore CBM 720
-cbm720_de
+//cbm720_de
-cbm720_se  // Commodore CBM 720 (Sweden / Finland)
+//cbm720_se  // Commodore CBM 720 (Sweden / Finland)
-cbm730
+//cbm730
-p500      // Commodore P500 (proto, a.k.a. C128-40, PET-II)
+//p500      // Commodore P500 (proto, a.k.a. C128-40, PET-II)
-p500p
+//p500p
 
 c264
 plus4
@@ -732,8 +732,8 @@ a4000tn
 c65    // 1991 C65 / C64DX (Prototype, NTSC)
 c64dx    // 1991 C65 / C64DX (Prototype, German PAL)
 
-mps1000 // 1986 Commodore MPS-1000 (dot matrix printer)
+//mps1000 // 1986 Commodore MPS-1000 (dot matrix printer)
-mps1230 // 1988 Commodore MPS-1230 near-letter-quality dot matrix printer
+//mps1230 // 1988 Commodore MPS-1230 near-letter-quality dot matrix printer
 
 // Epson
 px4    // 1985 Epson PX-4
@@ -1785,8 +1785,8 @@ abc806
 abc1600
 
 // Be Incorporated
-bebox    // BeBox Dual603-66
+//bebox    // BeBox Dual603-66
-bebox2  // BeBox Dual603-133
+//bebox2  // BeBox Dual603-133
 
 // Tiger Electronics
 gamecom   // Tiger Game.com
@@ -1866,8 +1866,8 @@ bk0010fd
 bk0011m
 
 // Bashkiria-2M
-b2m
+//b2m
-b2mrom
+//b2mrom
 
 // Radio-86RK
 radio86
@@ -1897,10 +1897,10 @@ braiplus
 irisha
 
 // PK-8020
-korvet
+//korvet
-kontur
+//kontur
-neiva
+//neiva
-bk8t
+//bk8t
 
 // Vector-06c
 vector06
@@ -2522,7 +2522,7 @@ uvc
 bridgec3
 vbrc
 vsc
-victor9k
+//victor9k
 phc25
 phc25j
 pv9234