diff --git a/src/mame/drivers/jupace.cpp b/src/mame/drivers/jupace.cpp
index 5bb5768521f..0ce284a9a44 100644
--- a/src/mame/drivers/jupace.cpp
+++ b/src/mame/drivers/jupace.cpp
@@ -170,11 +170,12 @@ private:
 
 SNAPSHOT_LOAD_MEMBER(ace_state::snapshot_cb)
 {
+	std::vector<uint8_t> RAM(0x10000);
 	cpu_device *cpu = m_maincpu;
-	uint8_t *RAM = memregion(cpu->tag())->base();
 	address_space &space = cpu->space(AS_PROGRAM);
-	unsigned char ace_repeat, ace_byte, loop;
-	int done=0, ace_index=0x2000;
+	unsigned char ace_repeat, ace_byte;
+	u16 ace_index=0x2000;
+	bool done = false;
 
 	if (m_ram->size() < 16*1024)
 	{
@@ -194,7 +195,7 @@ SNAPSHOT_LOAD_MEMBER(ace_state::snapshot_cb)
 			{
 			case 0x00:
 					logerror("File loaded!\r\n");
-					done = 1;
+					done = true;
 					break;
 			case 0x01:
 					image.fread(&ace_byte, 1);
@@ -202,7 +203,7 @@ SNAPSHOT_LOAD_MEMBER(ace_state::snapshot_cb)
 					break;
 			default:
 					image.fread(&ace_repeat, 1);
-					for (loop = 0; loop < ace_byte; loop++)
+					for (u8 loop = 0; loop < ace_byte; loop++)
 						RAM[ace_index++] = ace_repeat;
 					break;
 			}