From fd98f4512bba0c7f92dbf45244c6720a8268e295 Mon Sep 17 00:00:00 2001
From: arcadez2003 <51386955+arcadez2003@users.noreply.github.com>
Date: Tue, 6 Feb 2024 22:16:36 +0000
Subject: [PATCH] Alcon / Slap Fight MCU hookup

---
 src/machine/slapfght.c | 119 ++++++++++++++++++++++++++++++++++++++---
 1 file changed, 111 insertions(+), 8 deletions(-)

diff --git a/src/machine/slapfght.c b/src/machine/slapfght.c
index d1c1b6264..4e7957b1e 100644
--- a/src/machine/slapfght.c
+++ b/src/machine/slapfght.c
@@ -21,6 +21,16 @@ static int slapfight_status_state;
 extern unsigned char *getstar_e803;
 
 static unsigned char mcu_val;
+extern unsigned char *slapfight_scrollx_lo,*slapfight_scrollx_hi,*slapfight_scrolly;
+
+static unsigned char from_main,from_mcu;
+static int mcu_sent = 0,main_sent = 0;
+static unsigned char portA_in,portA_out,ddrA;
+static unsigned char portB_in,portB_out,ddrB;
+static unsigned char portC_in,portC_out,ddrC;
+
+
+
 
 /* Perform basic machine initialisation */
 MACHINE_RESET( slapfight )
@@ -113,6 +123,107 @@ READ8_HANDLER( slapfight_port_00_r )
 	return slapfight_status;
 }
 
+READ8_HANDLER( slapfight_68705_portA_r )
+{
+	return (portA_out & ddrA) | (portA_in & ~ddrA);
+}
+
+WRITE8_HANDLER( slapfight_68705_portA_w )
+{
+	portA_out = data;
+}
+
+WRITE8_HANDLER( slapfight_68705_ddrA_w )
+{
+	ddrA = data;
+}
+
+READ8_HANDLER( slapfight_68705_portB_r )
+{
+	return (portB_out & ddrB) | (portB_in & ~ddrB);
+}
+
+WRITE8_HANDLER( slapfight_68705_portB_w )
+{
+	if ((ddrB & 0x02) && (~data & 0x02) && (portB_out & 0x02))
+	{
+		portA_in = from_main;
+
+		if (main_sent)
+			//cputag_set_input_line(space->machine, "mcu", 0, CLEAR_LINE);
+			cpunum_set_input_line(2,0,CLEAR_LINE);
+
+		main_sent = 0;
+	}
+	if ((ddrB & 0x04) && (data & 0x04) && (~portB_out & 0x04))
+	{
+		from_mcu = portA_out;
+		mcu_sent = 1;
+	}
+	if ((ddrB & 0x08) && (~data & 0x08) && (portB_out & 0x08))
+	{
+		*slapfight_scrollx_lo = portA_out;
+	}
+	if ((ddrB & 0x10) && (~data & 0x10) && (portB_out & 0x10))
+	{
+		*slapfight_scrollx_hi = portA_out;
+	}
+
+	portB_out = data;
+}
+
+WRITE8_HANDLER( slapfight_68705_ddrB_w )
+{
+	ddrB = data;
+}
+
+READ8_HANDLER( slapfight_68705_portC_r )
+{
+	portC_in = 0;
+
+	if (main_sent)
+		portC_in |= 0x01;
+	if (!mcu_sent)
+		portC_in |= 0x02;
+
+	return (portC_out & ddrC) | (portC_in & ~ddrC);
+}
+
+WRITE8_HANDLER( slapfight_68705_portC_w )
+{
+	portC_out = data;
+}
+
+WRITE8_HANDLER( slapfight_68705_ddrC_w )
+{
+	ddrC = data;
+}
+
+WRITE8_HANDLER( slapfight_mcu_w )
+{
+	from_main = data;
+	main_sent = 1;
+	//cputag_set_input_line(space->machine, "mcu", 0, ASSERT_LINE);
+    cpunum_set_input_line(2,0,ASSERT_LINE);
+}
+
+READ8_HANDLER( slapfight_mcu_r )
+{
+	mcu_sent = 0;
+	return from_mcu;
+}
+
+READ8_HANDLER( slapfight_mcu_status_r )
+{
+	int res = 0;
+
+	if (!main_sent)
+		res |= 0x02;
+	if (!mcu_sent)
+		res |= 0x04;
+
+	return res;
+}
 
 
 /*
@@ -153,14 +264,6 @@ WRITE8_HANDLER( getstar_port_04_w )
 }
 
 
-/* Tiger Heli MCU */
-
-static unsigned char from_main,from_mcu;
-static int mcu_sent = 0,main_sent = 0;
-static unsigned char portA_in,portA_out,ddrA;
-static unsigned char portB_in,portB_out,ddrB;
-static unsigned char portC_in,portC_out,ddrC;
-
 READ8_HANDLER( tigerh_68705_portA_r )
 {
 	return (portA_out & ddrA) | (portA_in & ~ddrA);