summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/tti.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/mame/drivers/tti.cpp')
-rw-r--r--src/mame/drivers/tti.cpp64
1 files changed, 63 insertions, 1 deletions
diff --git a/src/mame/drivers/tti.cpp b/src/mame/drivers/tti.cpp
index 54077ada8a2..0e0c3642858 100644
--- a/src/mame/drivers/tti.cpp
+++ b/src/mame/drivers/tti.cpp
@@ -32,11 +32,22 @@ public:
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_mfp(*this, "mfp")
+ , m_asc(*this, "scsibus:7:asc")
+ , m_dma_address(0)
{ }
void tti(machine_config &config);
+protected:
+ virtual void machine_start() override;
+
private:
+ u8 asc_r(offs_t offset);
+ void asc_w(offs_t offset, u8 data);
+ void dma_address_w(offs_t offset, u8 data);
+ u8 io_status_r();
+ void channel_w(u8 data);
+
void asc_config(device_t *device);
IRQ_CALLBACK_MEMBER(intack);
@@ -45,8 +56,16 @@ private:
required_device<cpu_device> m_maincpu;
required_device<mc68901_device> m_mfp;
+ required_device<ncr53c90a_device> m_asc;
+
+ u32 m_dma_address;
};
+void tti_state::machine_start()
+{
+ save_item(NAME(m_dma_address));
+}
+
IRQ_CALLBACK_MEMBER(tti_state::intack)
{
return m_mfp->get_vector();
@@ -55,13 +74,56 @@ IRQ_CALLBACK_MEMBER(tti_state::intack)
static INPUT_PORTS_START( tti )
INPUT_PORTS_END
+u8 tti_state::asc_r(offs_t offset)
+{
+ return m_asc->read(offset ^ 1);
+}
+
+void tti_state::asc_w(offs_t offset, u8 data)
+{
+ m_asc->write(offset ^ 1, data);
+}
+
+void tti_state::dma_address_w(offs_t offset, u8 data)
+{
+ m_dma_address &= ~(0xff000000 >> (offset * 8));
+ m_dma_address |= u32(data) << (24 - offset * 8);
+}
+
+u8 tti_state::io_status_r()
+{
+ return 0;
+}
+
+void tti_state::channel_w(u8 data)
+{
+ switch (data & 0x03)
+ {
+ case 0:
+ m_mfp->i4_w(0);
+ break;
+
+ case 1:
+ m_mfp->i3_w(0);
+ break;
+
+ case 3:
+ m_mfp->i5_w(0);
+ break;
+ }
+}
+
void tti_state::prg_map(address_map &map)
{
map(0x00000, 0x07fff).rom().region("maincpu", 0);
map(0x7e000, 0x7ffff).ram();
map(0x80000, 0x80017).rw(m_mfp, FUNC(mc68901_device::read), FUNC(mc68901_device::write));
- map(0x80020, 0x8002b).m("scsibus:7:asc", FUNC(ncr53c90a_device::map));
+ map(0x80018, 0x8001f).ram();
+ map(0x80020, 0x8002b).rw(FUNC(tti_state::asc_r), FUNC(tti_state::asc_w));
map(0x80070, 0x80077).w("bitlatch", FUNC(ls259_device::write_d0));
+ map(0x80078, 0x8007b).w(FUNC(tti_state::dma_address_w));
+ map(0x8007c, 0x8007c).r(FUNC(tti_state::io_status_r));
+ map(0x8007d, 0x8007d).w(FUNC(tti_state::channel_w));
}
static void tti_scsi_devices(device_slot_interface &device)