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Diffstat (limited to 'src/mame/machine/chaknpop.c')
-rw-r--r--src/mame/machine/chaknpop.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/src/mame/machine/chaknpop.c b/src/mame/machine/chaknpop.c
new file mode 100644
index 00000000000..21eb9edefde
--- /dev/null
+++ b/src/mame/machine/chaknpop.c
@@ -0,0 +1,166 @@
+/*
+ * Chack'n Pop (C) 1983 TAITO Corp.
+ * simulate 68705 MCU
+ */
+
+#include "driver.h"
+#include "cpu/z80/z80.h"
+
+#define MCU_INITIAL_SEED 0x81
+
+UINT8 *chaknpop_ram;
+
+
+static UINT8 mcu_seed;
+static UINT8 mcu_select;
+static UINT8 mcu_result;
+
+/* mcu data that is extracted from the real board! */
+/* updated on 2st Jun 2003 */
+static UINT8 mcu_data[256] = {
+ 0x3a, 0xe6, 0x80, 0xc6, 0x0e, 0xdd, 0x77, 0xfd,
+ 0x7e, 0xfe, 0x10, 0x38, 0x10, 0xdd, 0x7e, 0x03,
+ 0xc6, 0x08, 0xdd, 0x77, 0x03, 0xdd, 0x7e, 0xff,
+ 0xc6, 0x08, 0xdd, 0x77, 0xff, 0x34, 0x23, 0xc9,
+ 0x06, 0x10, 0xdd, 0xe5, 0xe1, 0x23, 0x23, 0x23,
+ 0x4e, 0x23, 0x5e, 0x23, 0x56, 0x23, 0x23, 0x7b,
+ 0xb2, 0x28, 0x02, 0x79, 0x12, 0x10, 0xf1, 0xc9,
+ 0xe6, 0x03, 0x87, 0x87, 0x6f, 0x26, 0x00, 0x29,
+ 0x29, 0x29, 0xe5, 0x29, 0x29, 0x29, 0xc1, 0x09,
+ 0x01, 0xc3, 0x81, 0x09, 0xe5, 0xdd, 0xe1, 0xc9,
+ 0x10, 0x00, 0x08, 0x10, 0x20, 0x64, 0x50, 0x00,
+ 0x08, 0x50, 0xb0, 0x01, 0x34, 0xa0, 0x13, 0x34,
+ 0xb0, 0x05, 0x34, 0xc0, 0x04, 0x34, 0xd0, 0x02,
+ 0x34, 0xf0, 0x02, 0x34, 0x00, 0x60, 0x00, 0x00,
+ 0x3f, 0x00, 0x0c, 0x1f, 0xa0, 0x3f, 0x1e, 0xa2,
+ 0x01, 0x1e, 0xa1, 0x0a, 0x1e, 0xa2, 0x07, 0x1e,
+ 0x92, 0x05, 0x1e, 0x02, 0x04, 0x1e, 0x12, 0x09,
+ 0x3f, 0x22, 0x06, 0x3f, 0x21, 0x03, 0x3f, 0x20,
+ 0x02, 0x00, 0x00, 0x3f, 0x00, 0x04, 0x02, 0xa0,
+ 0x40, 0x12, 0xa1, 0x06, 0x12, 0xa2, 0x02, 0x12,
+ 0xa1, 0x0a, 0x12, 0xa2, 0x07, 0x10, 0x92, 0x05,
+ 0x10, 0x02, 0x04, 0x12, 0x12, 0x09, 0x12, 0x22,
+ 0x06, 0x12, 0x21, 0x03, 0x12, 0x20, 0x02, 0x26,
+ 0x00, 0x14, 0x12, 0x00, 0x00, 0x00, 0x3f, 0x00,
+ 0x04, 0x1a, 0xa0, 0x40, 0x3f, 0x00, 0x00, 0x00,
+ 0x3e, 0x3a, 0x87, 0x83, 0x3c, 0x32, 0x87, 0x83,
+ 0x0f, 0x0f, 0xe6, 0x07, 0xfe, 0x02, 0x20, 0x01,
+ 0xaf, 0x11, 0x40, 0x98, 0x1d, 0x12, 0x1d, 0x20,
+ 0xfb, 0x2a, 0x89, 0x83, 0x2b, 0x22, 0x89, 0x83,
+ 0xc9, 0x3a, 0x5b, 0x81, 0xa7, 0xc0, 0x21, 0x80,
+ 0x81, 0x11, 0x04, 0x00, 0x06, 0x09, 0x34, 0x19,
+ 0x10, 0xfc, 0x3e, 0x01, 0x32, 0x5b, 0x81, 0xc9
+};
+
+static void mcu_update_seed(UINT8 data)
+{
+ if (!(data & 0x80))
+ {
+ mcu_seed += 0x83;
+ mcu_seed = (mcu_seed & 0x80) | (mcu_seed >> 1);
+ }
+
+ mcu_seed += 0x19;
+
+ //logerror("New seed: 0x%02x\n", mcu_seed);
+}
+
+
+/***************************************************************************
+ Memory handlers
+***************************************************************************/
+
+READ8_HANDLER( chaknpop_mcu_portA_r )
+{
+ //logerror("%04x: MCU portA read\n", activecpu_get_pc());
+ return mcu_result;
+}
+
+
+READ8_HANDLER( chaknpop_mcu_portB_r )
+{
+ //logerror("%04x: MCU portB read\n", activecpu_get_pc());
+
+ return 0xff;
+}
+
+READ8_HANDLER( chaknpop_mcu_portC_r )
+{
+ //logerror("%04x: MCU portC read\n", activecpu_get_pc());
+ return 0x00;
+}
+
+WRITE8_HANDLER( chaknpop_mcu_portA_w )
+{
+ UINT8 mcu_command;
+
+ mcu_command = data + mcu_seed;
+ mcu_result = 0;
+
+ if (mcu_command < 0x08)
+ {
+ mcu_update_seed(data);
+
+ mcu_result = mcu_data[mcu_select * 8 + mcu_command];
+ mcu_result -= mcu_seed;
+
+ mcu_update_seed(mcu_result);
+
+ logerror("%04x: MCU command 0x%02x, result 0x%02x\n", activecpu_get_pc(), mcu_command, mcu_result);
+ }
+ else if (mcu_command >= 0x28 && mcu_command <= 0x2a)
+ {
+ mcu_update_seed(data);
+
+ mcu_result = chaknpop_ram[0x380 + mcu_command];
+ mcu_result -= mcu_seed;
+
+ mcu_update_seed(mcu_result);
+
+ logerror("%04x: MCU command 0x%02x, result 0x%02x\n", activecpu_get_pc(), mcu_command, mcu_result);
+ }
+ else if (mcu_command < 0x80)
+ {
+ mcu_update_seed(data);
+
+ if (mcu_command >= 0x40 && mcu_command < 0x60)
+ {
+ mcu_select = mcu_command - 0x40;
+
+ logerror("%04x: MCU select 0x%02x\n", activecpu_get_pc(), mcu_select);
+ }
+ }
+ else if (mcu_command == 0x9c|| mcu_command == 0xde)
+ {
+ mcu_update_seed(data);
+
+ logerror("%04x: MCU command 0x%02x\n", activecpu_get_pc(), mcu_command);
+ }
+}
+
+WRITE8_HANDLER( chaknpop_mcu_portB_w )
+{
+ //logerror("%04x: MCU portB write 0x%02x\n", activecpu_get_pc(), data);
+}
+
+WRITE8_HANDLER( chaknpop_mcu_portC_w )
+{
+ //logerror("%04x: MCU portC write 0x%02x\n", activecpu_get_pc(), data);
+}
+
+
+/***************************************************************************
+ Initialize mcu emulation
+***************************************************************************/
+
+DRIVER_INIT( chaknpop )
+{
+ state_save_register_global(mcu_seed);
+ state_save_register_global(mcu_result);
+ state_save_register_global(mcu_select);
+}
+
+MACHINE_RESET( chaknpop )
+{
+ mcu_seed = MCU_INITIAL_SEED;
+}