add new i2c eeprom (e2prom) device, hook it up in d_coleco and megadrive

makefile.burn_rules

@@ -104,7 +104,7 @@ drvsrc	= 	d_akkaarrh.o d_arcadecl.o d_atarig1.o d_badlands.o d_batman.o d_blstro
 depobj	= 	burn.o burn_bitmap.o burn_gun.o burn_led.o burn_shift.o burn_memory.o burn_pal.o burn_sound.o burn_sound_c.o cheat.o debug_track.o hiscore.o \
 			load.o burn_sha1.o tilemap_generic.o tiles_generic.o timer.o vector.o \
 			\
-			6821pia.o 6840ptm.o 8255ppi.o 8257dma.o c169.o atariic.o atarijsa.o atarimo.o atarirle.o atarivad.o avgdvg.o bsmt2000.o decobsmt.o ds2404.o dtimer.o earom.o eeprom.o epic12.o gaelco_crypt.o i4x00.o intelfsh.o \
+			6821pia.o 6840ptm.o 8255ppi.o 8257dma.o c169.o atariic.o atarijsa.o atarimo.o atarirle.o atarivad.o avgdvg.o bsmt2000.o decobsmt.o ds2404.o dtimer.o earom.o eeprom.o epic12.o gaelco_crypt.o i2ceeprom.o i4x00.o intelfsh.o \
 			joyprocess.o nb1414m4.o nb1414m4_8bit.o nmk004.o nmk112.o k1ge.o kaneko_hit.o kaneko_tmap.o mathbox.o mb87078.o mermaid.o midcsd.o midsat.o midsg.o midcvsd.o midssio.o midtcs.o \
 			namco_c45.o namcoio.o pandora.o pic8259.o pit8253.o poly.o qs1000.o resnet.o rtc9701.o seibucop.o seibusnd.o serflash.o sknsspr.o slapstic.o st0020.o t5182.o timekpr.o tlc34076.o tms34061.o v3021.o vdc.o \
 			tms9928a.o watchdog.o x2212.o \

src/burn/drv/coleco/d_coleco.cpp

@@ -9,6 +9,7 @@
 #include "ay8910.h" // sgm
 #include "tms9928a.h"
 #include "burn_gun.h" // trackball (Roller & Super Action controllers)
+#include "i2ceeprom.h"
 
 static UINT8 *AllMem;
 static UINT8 *MemEnd;
@@ -42,7 +43,11 @@ static UINT32 MegaCartBank; // current Bank
 static UINT32 MegaCartBanks; // total banks
 static INT32 OCMBanks[4];
 
-static INT32 use_EEPROM = 0;
+// for use_I2C (i2c 2-wire 24c02, +)
+static INT32 d_sda;
+static INT32 d_scl;
+
+static INT32 use_I2C = 0; // i2c eeprom
 static INT32 use_SGM = 0;
 static INT32 use_SAC = 0; // 1 = SuperAction, 2 = ROLLER
 static INT32 use_OCM = 0;
@@ -472,6 +477,12 @@ static INT32 DrvDoReset()
 
 	TMS9928AReset();
 
+	if (use_I2C) {
+		i2c_reset();
+		d_sda = 1;
+		d_scl = 1;
+	}
+
 	memset (DrvZ80RAM, 0xff, 0x400); // ram initialized to 0xff
 	if (!strncmp(BurnDrvGetTextA(DRV_NAME), "cv_heist", 8)) {
 		bprintf(0, _T("*** The Heist kludge..\n"));
@@ -528,15 +539,31 @@ static void O_EepScan()
 static void __fastcall main_write(UINT16 address, UINT8 data)
 {
 	// maybe we should support bankswitching on writes too?
-	//	  bprintf(0, _T("%x  %x\t\tfr %d  cyc %d\n"), address, data, nCurrentFrame, ZetTotalCycles());
-    if (use_EEPROM) { // for boxxle
+	//bprintf(0, _T("%x  %x\t\tfr %d  cyc %d\n"), address, data, nCurrentFrame, ZetTotalCycles());
+    if (use_I2C) { // for boxxle, black onyx, space shuttle, etc..
         switch (address)
         {
             case 0xff90:
             case 0xffa0:
             case 0xffb0:
                 MegaCartBank = (address >> 4) & 3;
 				return;
+			case 0xffc0:
+				d_scl = 0;
+				i2c_write_bit(d_sda, d_scl);
+				return;
+            case 0xffd0:
+				d_scl = 1;
+				i2c_write_bit(d_sda, d_scl);
+				return;
+            case 0xffe0:
+				d_sda = 0;
+				i2c_write_bit(d_sda, d_scl);
+				return;
+            case 0xfff0:
+				d_sda = 1;
+				i2c_write_bit(d_sda, d_scl);
+				return;
         }
 	}
 
@@ -621,6 +648,10 @@ static UINT8 __fastcall main_read(UINT16 address)
 		}
 	}
 
+	if (use_I2C && address == 0xff80) {
+		return DrvCartROM[i2c_read() ? 0xff80 : 0xbf80];
+	}
+
 	if (address >= 0xffc0/* && address <= 0xffff*/) {
 		MegaCartBank = (0xffff - address) & (MegaCartBanks - 1);
 
@@ -694,10 +725,11 @@ static INT32 DrvInit()
 		ZetMapMemory(DrvZ80RAM, i + 0x0000, i + 0x03ff, MAP_RAM);
 	}
 
-    if (use_EEPROM) {  // similar to MegaCart but with diff. mapper addresses
+    if (use_I2C) {  // similar to MegaCart but with diff. mapper addresses
 		// Boxxle
 		MegaCartBanks = MegaCart / 0x4000;
 		bprintf(0, _T("ColecoVision BoxxleCart mapping.\n"));
+		i2c_init((use_I2C == 1) ? I2C_24C02 : I2C_24C256);
 		ZetMapMemory(DrvCartROM, 0x8000, 0xbfff, MAP_ROM);
 		ZetSetReadHandler(main_read);
         ZetSetWriteHandler(main_write);
@@ -775,10 +807,16 @@ static INT32 DrvInitSGM() // w/SGM
     return DrvInit();
 }
 
-static INT32 DrvInitEEPROM() // w/EEPROM (boxxle)
+static INT32 DrvInitI2CBoxxle() // w/EEPROM (boxxle)
 {
-    // 24cXX e2prom isn't actually supported, but the game works fine (minus highscore saving)
-    use_EEPROM = 1;
+    use_I2C = 2;
+
+    return DrvInit();
+}
+
+static INT32 DrvInitI2C() // w/EEPROM (boxxle)
+{
+    use_I2C = 1;
 
     return DrvInit();
 }
@@ -802,8 +840,12 @@ static INT32 DrvExit()
 
 	BurnTrackballExit();
 
+	if (use_I2C) {
+		i2c_exit();
+	}
+
     use_SGM = 0;
-    use_EEPROM = 0;
+    use_I2C = 0;
 	use_SAC = 0;
 	use_OCM = 0;
 
@@ -960,13 +1002,21 @@ static INT32 DrvScan(INT32 nAction, INT32 *pnMin)
 		SCAN_VAR(last_state);
         SCAN_VAR(MegaCartBank);
         SCAN_VAR(SGM_map_24k);
-        SCAN_VAR(SGM_map_8k);
+		SCAN_VAR(SGM_map_8k);
+		if (use_I2C) {
+			SCAN_VAR(d_scl);
+			SCAN_VAR(d_sda);
+		}
 	}
 
 	if (nAction & ACB_NVRAM && use_OCM) {
 		ScanVar(DrvEEPROM, 0x400, "NV RAM");
 	}
 
+	if (use_I2C) {
+		i2c_scan(nAction, pnMin);
+	}
+
 	if (nAction & ACB_WRITE) {
 		if (use_SGM) {
 			ZetOpen(0);
@@ -5903,7 +5953,7 @@ struct BurnDriver BurnDrvcv_blackonyx = {
     NULL, NULL, NULL, NULL,
     BDF_GAME_WORKING | BDF_HOMEBREW, 1, HARDWARE_COLECO, GBF_RPG | GBF_MAZE, 0,
     CVGetZipName, cv_blackonyxRomInfo, cv_blackonyxRomName, NULL, NULL, NULL, NULL, ColecoInputInfo, ColecoDIPInfo,
-    DrvInitEEPROM, DrvExit, DrvFrame, TMS9928ADraw, DrvScan, NULL, TMS9928A_PALETTE_SIZE,
+    DrvInitI2C, DrvExit, DrvFrame, TMS9928ADraw, DrvScan, NULL, TMS9928A_PALETTE_SIZE,
     272, 228, 4, 3
 };
 
@@ -6055,7 +6105,7 @@ struct BurnDriver BurnDrvcv_boxxle = {
 	NULL, NULL, NULL, NULL,
 	BDF_GAME_WORKING | BDF_HOMEBREW, 1, HARDWARE_COLECO, GBF_PUZZLE, 0,
 	CVGetZipName, cv_boxxleRomInfo, cv_boxxleRomName, NULL, NULL, NULL, NULL, ColecoInputInfo, ColecoDIPInfo,
-	DrvInitEEPROM, DrvExit, DrvFrame, TMS9928ADraw, DrvScan, NULL, TMS9928A_PALETTE_SIZE,
+	DrvInitI2CBoxxle, DrvExit, DrvFrame, TMS9928ADraw, DrvScan, NULL, TMS9928A_PALETTE_SIZE,
 	272, 228, 4, 3
 };
 
@@ -10003,7 +10053,7 @@ STD_ROM_FN(cv_spaceshuttle)
 
 static INT32 DrvInitSGMEEPROM() // Space Shuttle
 {
-    use_EEPROM = 1;
+    use_I2C = 1;
     use_SGM = 1;
     return DrvInit();
 }