diff options
Diffstat (limited to 'src/mess/machine/isa_mpu401.c')
-rw-r--r-- | src/mess/machine/isa_mpu401.c | 105 |
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() +{ +} |