From 9e08b5cb4fceb8824a6973da93132175900ee9a6 Mon Sep 17 00:00:00 2001
From: dinkc64 <12570148+dinkc64@users.noreply.github.com>
Date: Fri, 20 Feb 2015 16:26:29 +0000
Subject: [PATCH] ..trying out CPU_IRQSTATUS_HOLD

---
 src/burn/drv/pre90s/d_1942.cpp   |  4 +---
 src/burn/drv/pre90s/d_jack.cpp   |  4 +---
 src/burn/drv/pre90s/d_suna8.cpp  | 20 +++++---------------
 src/burn/drv/pre90s/d_vulgus.cpp | 12 +++---------
 4 files changed, 10 insertions(+), 30 deletions(-)

diff --git a/src/burn/drv/pre90s/d_1942.cpp b/src/burn/drv/pre90s/d_1942.cpp
index 23ab954bc..367ae97f3 100644
--- a/src/burn/drv/pre90s/d_1942.cpp
+++ b/src/burn/drv/pre90s/d_1942.cpp
@@ -977,9 +977,7 @@ static INT32 DrvFrame()
 		nCyclesSegment = ZetRun(nCyclesSegment);
 		nCyclesDone[nCurrentCPU] += nCyclesSegment;
 		if (i & 1) { // 4 times per frame
-			ZetSetIRQLine(0, CPU_IRQSTATUS_ACK);
-			ZetRun(100); // needs long ack
-			ZetSetIRQLine(0, CPU_IRQSTATUS_NONE);
+			ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
 		}
 		ZetClose();
 		
diff --git a/src/burn/drv/pre90s/d_jack.cpp b/src/burn/drv/pre90s/d_jack.cpp
index 731b78ce7..827c6f8b4 100644
--- a/src/burn/drv/pre90s/d_jack.cpp
+++ b/src/burn/drv/pre90s/d_jack.cpp
@@ -857,9 +857,7 @@ void __fastcall jack_cpu0_write(UINT16 address, UINT8 data)
 			soundlatch = data;
 			ZetClose();
 			ZetOpen(1);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_ACK);
-			ZetRun(100);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_NONE);
+			ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
 			ZetClose();
 			ZetOpen(0);
 		break;
diff --git a/src/burn/drv/pre90s/d_suna8.cpp b/src/burn/drv/pre90s/d_suna8.cpp
index c49c53a33..b9d504e32 100644
--- a/src/burn/drv/pre90s/d_suna8.cpp
+++ b/src/burn/drv/pre90s/d_suna8.cpp
@@ -2159,9 +2159,7 @@ static INT32 HardheadFrame()
 		nCyclesSegment = (nCyclesTotal[1] / nInterleave) * (i + 1);
 		BurnTimerUpdateYM3812(nCyclesSegment);
 		if ((i % (nInterleave/4)) == ((nInterleave / 4) - 1)) {
-			ZetSetIRQLine(0, CPU_IRQSTATUS_ACK);
-			ZetRun(100);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_NONE);
+			ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
 		}
 		ZetClose();
 	}
@@ -2222,9 +2220,7 @@ static INT32 RrangerFrame()
 		nCyclesSegment = (nCyclesTotal[1] / nInterleave) * (i + 1);
 		BurnTimerUpdate(nCyclesSegment);
 		if ((i % (nInterleave/4)) == ((nInterleave / 4) - 1)) {
-			ZetSetIRQLine(0, CPU_IRQSTATUS_ACK);
-			ZetRun(100);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_NONE);
+			ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
 		}
 		ZetClose();
 	}
@@ -2282,9 +2278,7 @@ static INT32 Hardhea2Frame()
 		nCyclesSegment = (nCyclesTotal[1] / nInterleave) * (i + 1);
 		BurnTimerUpdateYM3812(nCyclesSegment);
 		if ((i % (nInterleave/4)) == ((nInterleave / 4) - 1)) {
-			ZetSetIRQLine(0, CPU_IRQSTATUS_ACK);
-			ZetRun(100);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_NONE);
+			ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
 		}
 		ZetClose();
 
@@ -2350,9 +2344,7 @@ static INT32 SparkmanFrame() // & starfigh
 		if (i == 112 && *nmi_enable) ZetNmi();
 		if (i == (Sparkman ? 250 : 255)) { // any other value and the sprites glitch (MAME uses 240 here, hmmm)
 			vblank = 1;
-			ZetSetIRQLine(0, CPU_IRQSTATUS_ACK);
-			ZetRun(100);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_NONE);
+			ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
 		}
 		ZetClose();
 
@@ -2360,9 +2352,7 @@ static INT32 SparkmanFrame() // & starfigh
 		nCyclesSegment = (nCyclesTotal[1] / nInterleave) * (i + 1);
 		BurnTimerUpdateYM3812(nCyclesSegment);
 		if ((i % (nInterleave/4)) == ((nInterleave / 4) - 1)) {
-			ZetSetIRQLine(0, CPU_IRQSTATUS_ACK);
-			ZetRun(100);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_NONE);
+			ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
 		}
 		ZetClose();
 	}
diff --git a/src/burn/drv/pre90s/d_vulgus.cpp b/src/burn/drv/pre90s/d_vulgus.cpp
index 6ae79f353..60a753d6c 100644
--- a/src/burn/drv/pre90s/d_vulgus.cpp
+++ b/src/burn/drv/pre90s/d_vulgus.cpp
@@ -570,23 +570,17 @@ static INT32 DrvFrame()
 		nCycles[0] -= ZetRun(nCycles[0] / (nInterleave - i));
 		if (i == ((nInterleave / 2) - 1)) {
 			ZetSetVector(0xd7);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_ACK);
-			ZetRun(100);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_NONE);
+			ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
 		}
 		if (i == ( nInterleave      - 1)) {
 			ZetSetVector(0xcf);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_ACK);
-			ZetRun(100);
-			ZetSetIRQLine(0, CPU_IRQSTATUS_NONE);
+			ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
 		}
 		ZetClose();
 
 		ZetOpen(1);
 		nCycles[1] -= ZetRun(nCycles[1] / (nInterleave - i));
-		ZetSetIRQLine(0, CPU_IRQSTATUS_ACK);
-		ZetRun(100);
-		ZetSetIRQLine(0, CPU_IRQSTATUS_NONE);
+		ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
 		ZetClose();
 
 		if (pBurnSoundOut) {