From 3d9aae8d72388a1ba9583510b793e92ba5d371c0 Mon Sep 17 00:00:00 2001
From: dinkc64 <12570148+dinkc64@users.noreply.github.com>
Date: Sat, 11 Aug 2018 23:02:09 +0000
Subject: [PATCH] add device for Atari EA ROM

---
 makefile.burn_rules        |  2 +-
 src/burn/devices/earom.cpp | 64 ++++++++++++++++++++++++++++++++++++++
 src/burn/devices/earom.h   |  9 ++++++
 3 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 src/burn/devices/earom.cpp
 create mode 100644 src/burn/devices/earom.h

diff --git a/makefile.burn_rules b/makefile.burn_rules
index a1c530334..5ca45bcec 100644
--- a/makefile.burn_rules
+++ b/makefile.burn_rules
@@ -91,7 +91,7 @@ endif
 depobj	= 	burn.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 \
 			tilemap_generic.o tiles_generic.o timer.o vector.o \
 			\
-			6821pia.o 8255ppi.o 8257dma.o c169.o avgdvg.o bsmt2000.o decobsmt.o eeprom.o gaelco_crypt.o joyprocess.o nb1414m4.o nb1414m4_8bit.o nmk004.o nmk112.o kaneko_tmap.o mathbox.o mb87078.o \
+			6821pia.o 8255ppi.o 8257dma.o c169.o avgdvg.o bsmt2000.o decobsmt.o earom.o eeprom.o gaelco_crypt.o joyprocess.o nb1414m4.o nb1414m4_8bit.o nmk004.o nmk112.o kaneko_tmap.o mathbox.o mb87078.o \
 			mermaid.o namco_c45.o namcoio.o pandora.o resnet.o seibusnd.o sknsspr.o slapstic.o st0020.o t5182.o timekpr.o tms34061.o v3021.o vdc.o tms9928a.o \
 			watchdog.o \
 			\
diff --git a/src/burn/devices/earom.cpp b/src/burn/devices/earom.cpp
new file mode 100644
index 000000000..734512022
--- /dev/null
+++ b/src/burn/devices/earom.cpp
@@ -0,0 +1,64 @@
+// Atari EA-ROM, impl. by dink
+
+#include "burnint.h"
+#include "earom.h"
+
+#define EAROM_SIZE	0x40
+static UINT8 earom_offset;
+static UINT8 earom_data;
+static UINT8 earom[EAROM_SIZE];
+
+UINT8 earom_read(UINT16 /*address*/)
+{
+	return (earom_data);
+}
+
+void earom_write(UINT16 offset, UINT8 data)
+{
+	earom_offset = offset;
+	earom_data = data;
+}
+
+void earom_ctrl_write(UINT16 /*offset*/, UINT8 data)
+{
+	if (data & 0x01)
+		earom_data = earom[earom_offset];
+	if ((data & 0x0c) == 0x0c) {
+		earom[earom_offset] = earom_data;
+	}
+}
+
+void earom_reset()
+{
+	earom_offset = 0;
+	earom_data = 0;
+}
+
+void earom_init()
+{
+	memset(&earom, 0, sizeof(earom));
+	earom_reset();
+}
+
+void earom_exit()
+{
+	// N/A
+}
+
+void earom_scan(INT32 nAction, INT32 *pnMin)
+{
+	if (nAction & ACB_VOLATILE) {
+		SCAN_VAR(earom_offset);
+		SCAN_VAR(earom_data);
+	}
+
+	if (nAction & ACB_NVRAM) {
+		struct BurnArea ba;
+
+		memset(&ba, 0, sizeof(ba));
+		ba.Data		= earom;
+		ba.nLen		= sizeof(earom);
+		ba.szName	= "NV RAM";
+		BurnAcb(&ba);
+	}
+}
diff --git a/src/burn/devices/earom.h b/src/burn/devices/earom.h
new file mode 100644
index 000000000..b7e99814c
--- /dev/null
+++ b/src/burn/devices/earom.h
@@ -0,0 +1,9 @@
+// Atari EA-ROM, impl. by dink
+
+UINT8 earom_read(UINT16 /*address*/);
+void earom_write(UINT16 offset, UINT8 data);
+void earom_ctrl_write(UINT16 /*offset*/, UINT8 data);
+void earom_reset();
+void earom_init();
+void earom_exit();
+void earom_scan(INT32 nAction, INT32 *pnMin);