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-rw-r--r--src/mess/machine/isa_mpu401.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/src/mess/machine/isa_mpu401.c b/src/mess/machine/isa_mpu401.c
new file mode 100644
index 00000000000..4b60e12166f
--- /dev/null
+++ b/src/mess/machine/isa_mpu401.c
@@ -0,0 +1,105 @@
+/***************************************************************************
+
+ MPU-401 MIDI device interface
+
+ TODO:
+ - skeleton, doesn't do anything
+
+***************************************************************************/
+
+#include "emu.h"
+#include "isa_mpu401.h"
+#include "machine/pic8259.h"
+
+/*
+DIP-SWs
+1-2-3-4
+ 0x200
+ 1 0x210
+ 1 0x220
+...
+1 1 1 0x330 (default)
+...
+1 1 1 1 0x370
+
+5-6-7-8
+1 irq2 (default)
+ 1 irq3
+ 1 irq5
+ 1 irq7
+*/
+
+READ8_MEMBER( isa8_mpu401_device::mpu401_r )
+{
+ UINT8 res;
+
+ if(offset == 0) // data
+ {
+ res = 0xff;
+ }
+ else // status
+ {
+ res = 0x3f | 0x80; // bit 7 queue empty (DSR), bit 6 DRR (Data Receive Ready?)
+ }
+
+ return res;
+}
+
+WRITE8_MEMBER( isa8_mpu401_device::mpu401_w )
+{
+ if(offset == 0) // data
+ {
+ printf("%02x %02x\n",offset,data);
+ }
+ else // command
+ {
+ printf("%02x %02x\n",offset,data);
+
+ switch(data)
+ {
+ case 0xff: // reset
+ //m_isa->irq2_w(1);
+ break;
+ }
+ }
+
+}
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+const device_type ISA8_MPU401 = &device_creator<isa8_mpu401_device>;
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// isa8_adlib_device - constructor
+//-------------------------------------------------
+
+isa8_mpu401_device::isa8_mpu401_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, ISA8_MPU401, "Roland MPU-401 Sound Card", tag, owner, clock),
+ device_isa8_card_interface( mconfig, *this )
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void isa8_mpu401_device::device_start()
+{
+ set_isa_device();
+ m_isa->install_device(0x330, 0x0331, 0, 0, read8_delegate(FUNC(isa8_mpu401_device::mpu401_r), this), write8_delegate(FUNC(isa8_mpu401_device::mpu401_w), this));
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void isa8_mpu401_device::device_reset()
+{
+}