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-rw-r--r--src/devices/bus/vic20/vic1112.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/src/devices/bus/vic20/vic1112.c b/src/devices/bus/vic20/vic1112.c
new file mode 100644
index 00000000000..482f7f01b03
--- /dev/null
+++ b/src/devices/bus/vic20/vic1112.c
@@ -0,0 +1,216 @@
+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Commodore VIC-1112 IEEE-488 Interface Cartridge emulation
+
+**********************************************************************/
+
+#include "vic1112.h"
+
+
+
+//**************************************************************************
+// MACROS / CONSTANTS
+//**************************************************************************
+
+#define M6522_0_TAG "u4"
+#define M6522_1_TAG "u5"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type VIC1112 = &device_creator<vic1112_device>;
+
+
+WRITE_LINE_MEMBER( vic1112_device::via0_irq_w )
+{
+ m_via0_irq = state;
+
+ m_slot->irq_w(m_via0_irq | m_via1_irq);
+}
+
+READ8_MEMBER( vic1112_device::via0_pb_r )
+{
+ /*
+
+ bit description
+
+ PB0
+ PB1
+ PB2
+ PB3 _EOI
+ PB4 _DAV IN
+ PB5 _NRFD IN
+ PB6 _NDAC IN
+ PB7 _ATN IN
+
+ */
+
+ UINT8 data = 0;
+
+ data |= m_bus->eoi_r() << 3;
+ data |= m_bus->dav_r() << 4;
+ data |= m_bus->nrfd_r() << 5;
+ data |= m_bus->ndac_r() << 6;
+ data |= m_bus->atn_r() << 7;
+
+ return data;
+}
+
+WRITE8_MEMBER( vic1112_device::via0_pb_w )
+{
+ /*
+
+ bit description
+
+ PB0 _DAV OUT
+ PB1 _NRFD OUT
+ PB2 _NDAC OUT
+ PB3
+ PB4
+ PB5
+ PB6
+ PB7
+
+ */
+
+ m_bus->dav_w(BIT(data, 0));
+ m_bus->nrfd_w(BIT(data, 1));
+ m_bus->ndac_w(BIT(data, 2));
+}
+
+
+WRITE_LINE_MEMBER( vic1112_device::via1_irq_w )
+{
+ m_via1_irq = state;
+
+ m_slot->irq_w(m_via0_irq | m_via1_irq);
+}
+
+
+//-------------------------------------------------
+// MACHINE_DRIVER( vic1112 )
+//-------------------------------------------------
+
+static MACHINE_CONFIG_FRAGMENT( vic1112 )
+ MCFG_DEVICE_ADD(M6522_0_TAG, VIA6522, 0)
+ MCFG_VIA6522_READPB_HANDLER(READ8(vic1112_device, via0_pb_r))
+ MCFG_VIA6522_WRITEPB_HANDLER(WRITE8(vic1112_device, via0_pb_w))
+ MCFG_VIA6522_IRQ_HANDLER(WRITELINE(vic1112_device, via0_irq_w))
+
+ MCFG_DEVICE_ADD(M6522_1_TAG, VIA6522, 0)
+ MCFG_VIA6522_READPB_HANDLER(DEVREAD8(IEEE488_TAG, ieee488_device, dio_r))
+ MCFG_VIA6522_WRITEPA_HANDLER(DEVWRITE8(IEEE488_TAG, ieee488_device, dio_w))
+ MCFG_VIA6522_CA2_HANDLER(DEVWRITELINE(IEEE488_TAG, ieee488_device, atn_w))
+ MCFG_VIA6522_CB2_HANDLER(DEVWRITELINE(IEEE488_TAG, ieee488_device, eoi_w))
+ MCFG_VIA6522_IRQ_HANDLER(WRITELINE(vic1112_device, via1_irq_w))
+
+ MCFG_CBM_IEEE488_ADD(NULL)
+ MCFG_IEEE488_SRQ_CALLBACK(DEVWRITELINE(M6522_1_TAG, via6522_device, write_cb1))
+MACHINE_CONFIG_END
+
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+machine_config_constructor vic1112_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( vic1112 );
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// vic1112_device - constructor
+//-------------------------------------------------
+
+vic1112_device::vic1112_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, VIC1112, "VIC1112", tag, owner, clock, "vic1112", __FILE__),
+ device_vic20_expansion_card_interface(mconfig, *this),
+ m_via0(*this, M6522_0_TAG),
+ m_via1(*this, M6522_1_TAG),
+ m_bus(*this, IEEE488_TAG)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void vic1112_device::device_start()
+{
+ // state saving
+ save_item(NAME(m_via0_irq));
+ save_item(NAME(m_via1_irq));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void vic1112_device::device_reset()
+{
+ m_bus->ifc_w(0);
+ m_bus->ifc_w(1);
+}
+
+
+//-------------------------------------------------
+// vic20_cd_r - cartridge data read
+//-------------------------------------------------
+
+UINT8 vic1112_device::vic20_cd_r(address_space &space, offs_t offset, UINT8 data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3)
+{
+ if (!io2)
+ {
+ if (offset & 0x10)
+ {
+ data = m_via1->read(space, offset & 0x0f);
+ }
+ else
+ {
+ data = m_via0->read(space, offset & 0x0f);
+ }
+ }
+ else if (!blk5)
+ {
+ if (offset & 0x1000)
+ {
+ data = m_blk5[offset & 0x17ff];
+ }
+ }
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// vic20_cd_w - cartridge data write
+//-------------------------------------------------
+
+void vic1112_device::vic20_cd_w(address_space &space, offs_t offset, UINT8 data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3)
+{
+ if (!io2)
+ {
+ if (offset & 0x10)
+ {
+ m_via1->write(space, offset & 0x0f, data);
+ }
+ else
+ {
+ m_via0->write(space, offset & 0x0f, data);
+ }
+ }
+}