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author Wilbert Pol <wilbert@jdg.info>2013-01-13 13:40:46 +0000
committer Wilbert Pol <wilbert@jdg.info>2013-01-13 13:40:46 +0000
commit2838333f3333820b95fba463ddd254d0ae273230 (patch)
tree4ecd1406bb5ced2e9207ed376960c7cb16807f56 /src
parent0e08e2d700c7f06b2250cb8666c6f389802ad260 (diff)
(MESS)sms.c: Mark-III does not have I/O port E and F. (nw)
Diffstat (limited to 'src')
-rw-r--r--src/mess/drivers/sms.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/src/mess/drivers/sms.c b/src/mess/drivers/sms.c
index 245f3edbb8b..54d44ec6f23 100644
--- a/src/mess/drivers/sms.c
+++ b/src/mess/drivers/sms.c
@@ -133,6 +133,30 @@ static ADDRESS_MAP_START( sms_io, AS_IO, 8, sms_state )
AM_RANGE(0xf9, 0xf9) AM_MIRROR(0x06) AM_READ(sms_input_port_1_r)
ADDRESS_MAP_END
+
+// I/O ports $3E and $3F do not exist o Mark-III
+static ADDRESS_MAP_START( sms_no3e3f_io, AS_IO, 8, sms_state )
+ ADDRESS_MAP_GLOBAL_MASK(0xff)
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0x40, 0x7f) AM_READ(sms_count_r)
+ AM_RANGE(0x40, 0x7f) AM_DEVWRITE("segapsg", segapsg_device, write)
+ AM_RANGE(0x80, 0x80) AM_MIRROR(0x3e) AM_DEVREADWRITE("sms_vdp", sega315_5124_device, vram_read, vram_write)
+ AM_RANGE(0x81, 0x81) AM_MIRROR(0x3e) AM_DEVREADWRITE("sms_vdp", sega315_5124_device, register_read, register_write)
+ AM_RANGE(0xc0, 0xc0) AM_MIRROR(0x1e) AM_READ(sms_input_port_0_r)
+ AM_RANGE(0xc1, 0xc1) AM_MIRROR(0x1e) AM_READ(sms_input_port_1_r)
+ AM_RANGE(0xe0, 0xe0) AM_MIRROR(0x0e) AM_READ(sms_input_port_0_r)
+ AM_RANGE(0xe1, 0xe1) AM_MIRROR(0x0e) AM_READ(sms_input_port_1_r)
+ AM_RANGE(0xf0, 0xf0) AM_READWRITE(sms_input_port_0_r, sms_ym2413_register_port_0_w)
+ AM_RANGE(0xf1, 0xf1) AM_READWRITE(sms_input_port_1_r, sms_ym2413_data_port_0_w)
+ AM_RANGE(0xf2, 0xf2) AM_READWRITE(sms_fm_detect_r, sms_fm_detect_w)
+ AM_RANGE(0xf3, 0xf3) AM_READ(sms_input_port_1_r)
+ AM_RANGE(0xf4, 0xf4) AM_MIRROR(0x02) AM_READ(sms_input_port_0_r)
+ AM_RANGE(0xf5, 0xf5) AM_MIRROR(0x02) AM_READ(sms_input_port_1_r)
+ AM_RANGE(0xf8, 0xf8) AM_MIRROR(0x06) AM_READ(sms_input_port_0_r)
+ AM_RANGE(0xf9, 0xf9) AM_MIRROR(0x06) AM_READ(sms_input_port_1_r)
+ADDRESS_MAP_END
+
+
// It seems the Korean version does some more strict decoding on the I/O
// addresses.
// At least the mirrors for I/O ports $3E/$3F don't seem to exist there.
@@ -587,6 +611,8 @@ static MACHINE_CONFIG_DERIVED( sms_fm, sms1_ntsc )
MACHINE_CONFIG_END
static MACHINE_CONFIG_DERIVED( sg1000m3, sms_fm )
+ MCFG_CPU_MODIFY("maincpu")
+ MCFG_CPU_IO_MAP(sms_no3e3f_io)
MCFG_CARTSLOT_MODIFY("cart1")
MCFG_CARTSLOT_EXTENSION_LIST("sms,bin,sg")