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-rw-r--r--src/devices/machine/mos6530n.cpp877
1 files changed, 877 insertions, 0 deletions
diff --git a/src/devices/machine/mos6530n.cpp b/src/devices/machine/mos6530n.cpp
new file mode 100644
index 00000000000..2f1b2258555
--- /dev/null
+++ b/src/devices/machine/mos6530n.cpp
@@ -0,0 +1,877 @@
+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ MOS Technology 6530 Memory, I/O, Timer Array emulation
+ MOS Technology 6532 RAM, I/O, Timer Array emulation
+
+**********************************************************************/
+
+#include "mos6530n.h"
+
+
+
+//**************************************************************************
+// MACROS / CONSTANTS
+//**************************************************************************
+
+#define LOG 0
+#define LOG_TIMER 0
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type MOS6530n = &device_creator<mos6530_t>;
+const device_type MOS6532n = &device_creator<mos6532_t>;
+
+
+DEVICE_ADDRESS_MAP_START( rom_map, 8, mos6530_t )
+ ADDRESS_MAP_GLOBAL_MASK(0x3ff)
+ AM_RANGE(0x000, 0x3ff) AM_READ(rom_r)
+ADDRESS_MAP_END
+
+DEVICE_ADDRESS_MAP_START( ram_map, 8, mos6530_t )
+ ADDRESS_MAP_GLOBAL_MASK(0x3f)
+ AM_RANGE(0x00, 0x3f) AM_READWRITE(ram_r, ram_w)
+ADDRESS_MAP_END
+
+DEVICE_ADDRESS_MAP_START( io_map, 8, mos6530_t )
+ ADDRESS_MAP_GLOBAL_MASK(0xf)
+ AM_RANGE(0x00, 0x00) AM_MIRROR(0x8) AM_READWRITE(pa_data_r, pa_data_w)
+ AM_RANGE(0x01, 0x01) AM_MIRROR(0x8) AM_READWRITE(pa_ddr_r, pa_ddr_w)
+ AM_RANGE(0x02, 0x02) AM_MIRROR(0x8) AM_READWRITE(pb_data_r, pb_data_w)
+ AM_RANGE(0x03, 0x03) AM_MIRROR(0x8) AM_READWRITE(pb_ddr_r, pb_ddr_w)
+ AM_RANGE(0x04, 0x07) AM_WRITE(timer_off_w)
+ AM_RANGE(0x0c, 0x0f) AM_WRITE(timer_on_w)
+ AM_RANGE(0x04, 0x04) AM_MIRROR(0x2) AM_READ(timer_off_r)
+ AM_RANGE(0x0c, 0x0c) AM_MIRROR(0x2) AM_READ(timer_on_r)
+ AM_RANGE(0x05, 0x05) AM_MIRROR(0xa) AM_READ(irq_r)
+ADDRESS_MAP_END
+
+DEVICE_ADDRESS_MAP_START( ram_map, 8, mos6532_t )
+ ADDRESS_MAP_GLOBAL_MASK(0x7f)
+ AM_RANGE(0x00, 0x7f) AM_READWRITE(ram_r, ram_w)
+ADDRESS_MAP_END
+
+DEVICE_ADDRESS_MAP_START( io_map, 8, mos6532_t )
+ ADDRESS_MAP_GLOBAL_MASK(0x1f)
+ AM_RANGE(0x00, 0x00) AM_MIRROR(0x18) AM_READWRITE(pa_data_r, pa_data_w) // SWCHA
+ AM_RANGE(0x01, 0x01) AM_MIRROR(0x18) AM_READWRITE(pa_ddr_r, pa_ddr_w) // SWACNT
+ AM_RANGE(0x02, 0x02) AM_MIRROR(0x18) AM_READWRITE(pb_data_r, pb_data_w) // SWCHB
+ AM_RANGE(0x03, 0x03) AM_MIRROR(0x18) AM_READWRITE(pb_ddr_r, pb_ddr_w) // SWBCNT
+ AM_RANGE(0x14, 0x17) AM_WRITE(timer_off_w)
+ AM_RANGE(0x1c, 0x1f) AM_WRITE(timer_on_w)
+ AM_RANGE(0x04, 0x04) AM_MIRROR(0x12) AM_READ(timer_off_r)
+ AM_RANGE(0x0c, 0x0c) AM_MIRROR(0x12) AM_READ(timer_on_r)
+ AM_RANGE(0x05, 0x05) AM_MIRROR(0x1a) AM_READ(irq_r)
+ AM_RANGE(0x04, 0x07) AM_MIRROR(0x8) AM_WRITE(edge_w)
+ADDRESS_MAP_END
+
+READ8_MEMBER(mos6532_t::io_r)
+{
+ offset &= 0x1f;
+ UINT8 ret = 0;
+
+ if (offset == 0x00 || offset == 0x08 || offset == 0x10 || offset == 0x18) ret = pa_data_r(space, 0);
+ if (offset == 0x01 || offset == 0x09 || offset == 0x11 || offset == 0x19) ret = pa_ddr_r(space, 0);
+ if (offset == 0x02 || offset == 0x0a || offset == 0x12 || offset == 0x1a) ret = pb_data_r(space, 0);
+ if (offset == 0x03 || offset == 0x0b || offset == 0x13 || offset == 0x1b) ret = pb_ddr_r(space, 0);
+
+ if (offset == 0x04 || offset == 0x06 || offset == 0x14 || offset == 0x16) ret = timer_off_r(space, 0);
+ if (offset == 0x0c || offset == 0x0e || offset == 0x1c || offset == 0x1e) ret = timer_on_r(space, 0);
+
+ if (offset == 0x05 || offset == 0x07 || offset == 0x0d || offset == 0x0f) ret = irq_r(space, 0);
+ if (offset == 0x15 || offset == 0x17 || offset == 0x1d || offset == 0x1f) ret = irq_r(space, 0);
+
+ return ret;
+}
+
+WRITE8_MEMBER(mos6532_t::io_w)
+{
+ offset &= 0x1f;
+
+ if (offset == 0x00 || offset == 0x08 || offset == 0x10 || offset == 0x18) pa_data_w(space, 0, data);
+ if (offset == 0x01 || offset == 0x09 || offset == 0x11 || offset == 0x19) pa_ddr_w(space, 0, data);
+ if (offset == 0x02 || offset == 0x0a || offset == 0x12 || offset == 0x1a) pb_data_w(space, 0, data);
+ if (offset == 0x03 || offset == 0x0b || offset == 0x13 || offset == 0x1b) pb_ddr_w(space, 0, data);
+ if (offset == 0x14 || offset == 0x15 || offset == 0x16 || offset == 0x17) timer_off_w(space, offset&3, data);
+ if (offset == 0x1c || offset == 0x1d || offset == 0x1e || offset == 0x1f) timer_on_w(space, offset&3, data);
+
+ if (offset == 0x04 || offset == 0x05 || offset == 0x06 || offset == 0x07) edge_w(space, offset&3, data);
+ if (offset == 0x0c || offset == 0x0d || offset == 0xea || offset == 0x0f) edge_w(space, offset&3, data);
+}
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// mos6530_base_t - constructor
+//-------------------------------------------------
+
+mos6530_base_t::mos6530_base_t(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) :
+ device_t(mconfig, type, name, tag, owner, clock, shortname, source),
+ m_ram(*this),
+ m_irq_cb(*this),
+ m_in_pa_cb(*this),
+ m_out_pa_cb(*this),
+ m_in_pb_cb(*this),
+ m_out_pb_cb(*this),
+ m_in_pa0_cb(*this),
+ m_in_pa1_cb(*this),
+ m_in_pa2_cb(*this),
+ m_in_pa3_cb(*this),
+ m_in_pa4_cb(*this),
+ m_in_pa5_cb(*this),
+ m_in_pa6_cb(*this),
+ m_in_pa7_cb(*this),
+ m_out_pa0_cb(*this),
+ m_out_pa1_cb(*this),
+ m_out_pa2_cb(*this),
+ m_out_pa3_cb(*this),
+ m_out_pa4_cb(*this),
+ m_out_pa5_cb(*this),
+ m_out_pa6_cb(*this),
+ m_out_pa7_cb(*this),
+ m_in_pb0_cb(*this),
+ m_in_pb1_cb(*this),
+ m_in_pb2_cb(*this),
+ m_in_pb3_cb(*this),
+ m_in_pb4_cb(*this),
+ m_in_pb5_cb(*this),
+ m_in_pb6_cb(*this),
+ m_in_pb7_cb(*this),
+ m_out_pb0_cb(*this),
+ m_out_pb1_cb(*this),
+ m_out_pb2_cb(*this),
+ m_out_pb3_cb(*this),
+ m_out_pb4_cb(*this),
+ m_out_pb5_cb(*this),
+ m_out_pb6_cb(*this),
+ m_out_pb7_cb(*this),
+ m_pa_in(0xff),
+ m_pa_out(0),
+ m_pa_ddr(0),
+ m_pa7(0),
+ m_pa7_dir(0),
+ m_pb_in(0xff),
+ m_pb_out(0),
+ m_pb_ddr(0),
+ m_ie_timer(false),
+ m_irq_timer(true),
+ m_ie_edge(false),
+ m_irq_edge(false)
+{
+ cur_live.tm = attotime::never;
+ cur_live.state = IDLE;
+ cur_live.next_state = -1;
+}
+
+
+//-------------------------------------------------
+// mos6530_t - constructor
+//-------------------------------------------------
+
+mos6530_t::mos6530_t(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : mos6530_base_t(mconfig, MOS6530n, "MOS6530n", tag, owner, clock, "mos6530n", __FILE__) { }
+
+
+//-------------------------------------------------
+// mos6532_t - constructor
+//-------------------------------------------------
+
+mos6532_t::mos6532_t(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : mos6530_base_t(mconfig, MOS6532n, "MOS6532n", tag, owner, clock, "mos6532n", __FILE__) { }
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void mos6530_base_t::device_start()
+{
+ // resolve callbacks
+ m_irq_cb.resolve_safe();
+ m_in_pa_cb.resolve();
+ m_out_pa_cb.resolve();
+ m_in_pb_cb.resolve();
+ m_out_pb_cb.resolve();
+ m_in_pa0_cb.resolve();
+ m_in_pa1_cb.resolve();
+ m_in_pa2_cb.resolve();
+ m_in_pa3_cb.resolve();
+ m_in_pa4_cb.resolve();
+ m_in_pa5_cb.resolve();
+ m_in_pa6_cb.resolve();
+ m_in_pa7_cb.resolve();
+ m_out_pa0_cb.resolve_safe();
+ m_out_pa1_cb.resolve_safe();
+ m_out_pa2_cb.resolve_safe();
+ m_out_pa3_cb.resolve_safe();
+ m_out_pa4_cb.resolve_safe();
+ m_out_pa5_cb.resolve_safe();
+ m_out_pa6_cb.resolve_safe();
+ m_out_pa7_cb.resolve_safe();
+ m_in_pb0_cb.resolve();
+ m_in_pb1_cb.resolve();
+ m_in_pb2_cb.resolve();
+ m_in_pb3_cb.resolve();
+ m_in_pb4_cb.resolve();
+ m_in_pb5_cb.resolve();
+ m_in_pb6_cb.resolve();
+ m_in_pb7_cb.resolve();
+ m_out_pb0_cb.resolve_safe();
+ m_out_pb1_cb.resolve_safe();
+ m_out_pb2_cb.resolve_safe();
+ m_out_pb3_cb.resolve_safe();
+ m_out_pb4_cb.resolve_safe();
+ m_out_pb5_cb.resolve_safe();
+ m_out_pb6_cb.resolve_safe();
+ m_out_pb7_cb.resolve_safe();
+
+ // allocate timer
+ t_gen = timer_alloc(0);
+
+ // state saving
+ save_item(NAME(m_pa_in));
+ save_item(NAME(m_pa_out));
+ save_item(NAME(m_pa_ddr));
+ save_item(NAME(m_pa7));
+ save_item(NAME(m_pa7_dir));
+ save_item(NAME(m_pb_in));
+ save_item(NAME(m_pb_out));
+ save_item(NAME(m_pb_ddr));
+ save_item(NAME(m_ie_timer));
+ save_item(NAME(m_irq_timer));
+ save_item(NAME(m_ie_edge));
+ save_item(NAME(m_irq_edge));
+ save_item(NAME(m_prescale));
+ save_item(NAME(m_timer));
+}
+
+void mos6530_t::device_start()
+{
+ mos6530_base_t::device_start();
+
+ // allocate RAM
+ m_ram.allocate(0x40);
+}
+
+void mos6532_t::device_start()
+{
+ mos6530_base_t::device_start();
+
+ // allocate RAM
+ m_ram.allocate(0x80);
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void mos6530_base_t::device_reset()
+{
+ m_pa_out = 0xff;
+ m_pa_ddr = 0;
+ m_pb_out = 0xff; // a7800 One-On-One Basketball (1on1u) needs this or you can't start a game, it doesn't initialize it. (see MT6060)
+ m_pb_ddr = 0;
+
+ m_ie_timer = false;
+ m_irq_timer = false;
+ m_ie_edge = false;
+ m_irq_edge = false;
+ m_pa7_dir = 0;
+
+ update_pa();
+ update_pb();
+ update_irq();
+ edge_detect();
+
+ m_timer = 0xff;
+ m_prescale = 1024;
+
+ if (cur_live.state != IDLE) {
+ live_abort();
+ }
+
+ live_start();
+ live_run();
+}
+
+
+//-------------------------------------------------
+// device_timer - handler timer events
+//-------------------------------------------------
+
+void mos6530_base_t::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+ live_sync();
+ live_run();
+}
+
+
+//-------------------------------------------------
+// update_pa -
+//-------------------------------------------------
+
+void mos6530_base_t::update_pa()
+{
+ UINT8 out = m_pa_out;
+ UINT8 ddr = m_pa_ddr;
+ UINT8 data = (out & ddr) | (ddr ^ 0xff);
+
+ if (m_out_pa_cb.isnull())
+ {
+ m_out_pa0_cb(BIT(data, 0));
+ m_out_pa1_cb(BIT(data, 1));
+ m_out_pa2_cb(BIT(data, 2));
+ m_out_pa3_cb(BIT(data, 3));
+ m_out_pa4_cb(BIT(data, 4));
+ m_out_pa5_cb(BIT(data, 5));
+ m_out_pa6_cb(BIT(data, 6));
+ m_out_pa7_cb(BIT(data, 7));
+ }
+ else
+ {
+ m_out_pa_cb(data);
+ }
+}
+
+
+//-------------------------------------------------
+// update_pb -
+//-------------------------------------------------
+
+void mos6530_base_t::update_pb()
+{
+ UINT8 out = m_pb_out;
+ UINT8 ddr = m_pb_ddr;
+ UINT8 data = (out & ddr) | (ddr ^ 0xff);
+
+ if (m_out_pb_cb.isnull())
+ {
+ m_out_pb0_cb(BIT(data, 0));
+ m_out_pb1_cb(BIT(data, 1));
+ m_out_pb2_cb(BIT(data, 2));
+ m_out_pb3_cb(BIT(data, 3));
+ m_out_pb4_cb(BIT(data, 4));
+ m_out_pb5_cb(BIT(data, 5));
+ m_out_pb6_cb(BIT(data, 6));
+ m_out_pb7_cb(BIT(data, 7));
+ }
+ else
+ {
+ m_out_pb_cb(data);
+ }
+}
+
+void mos6530_t::update_pb()
+{
+ UINT8 out = m_pb_out;
+ UINT8 ddr = m_pb_ddr;
+ UINT8 data = (out & ddr) | (ddr ^ 0xff);
+
+ if (m_ie_timer)
+ {
+ if (m_irq_timer) {
+ data |= IRQ_TIMER;
+ } else {
+ data &= ~IRQ_TIMER;
+ }
+ }
+
+ if (m_out_pb_cb.isnull())
+ {
+ m_out_pb0_cb(BIT(data, 0));
+ m_out_pb1_cb(BIT(data, 1));
+ m_out_pb2_cb(BIT(data, 2));
+ m_out_pb3_cb(BIT(data, 3));
+ m_out_pb4_cb(BIT(data, 4));
+ m_out_pb5_cb(BIT(data, 5));
+ m_out_pb6_cb(BIT(data, 6));
+ m_out_pb7_cb(BIT(data, 7));
+ }
+ else
+ {
+ m_out_pb_cb(data);
+ }
+}
+
+
+//-------------------------------------------------
+// update_irq -
+//-------------------------------------------------
+
+void mos6530_base_t::update_irq()
+{
+ int state = CLEAR_LINE;
+
+ if (m_ie_timer && m_irq_timer) state = ASSERT_LINE;
+ if (m_ie_edge && m_irq_edge) state = ASSERT_LINE;
+
+ m_irq_cb(state);
+}
+
+void mos6530_t::update_irq()
+{
+ update_pb();
+}
+
+
+//-------------------------------------------------
+// get_irq_flags -
+//-------------------------------------------------
+
+UINT8 mos6530_base_t::get_irq_flags()
+{
+ UINT8 data = 0;
+
+ if (m_irq_timer) data |= IRQ_TIMER;
+ if (m_irq_edge) data |= IRQ_EDGE;
+
+ return data;
+}
+
+UINT8 mos6530_t::get_irq_flags()
+{
+ UINT8 data = 0;
+
+ if (m_irq_timer) data |= IRQ_TIMER;
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// edge_detect -
+//-------------------------------------------------
+
+void mos6530_base_t::edge_detect()
+{
+ UINT8 ddr_out = m_pa_ddr;
+ UINT8 ddr_in = m_pa_ddr ^ 0xff;
+ UINT8 data = (m_pa_out & ddr_out) | (m_pa_in & ddr_in);
+ int state = BIT(data, 7);
+
+ if ((m_pa7 ^ state) && (m_pa7_dir ^ state) == 0)
+ {
+ if (LOG) logerror("%s %s '%s' edge-detect IRQ\n", machine().time().as_string(), name(), tag());
+
+ m_irq_edge = true;
+ update_irq();
+ }
+
+ m_pa7 = state;
+}
+
+
+//-------------------------------------------------
+// pa_w -
+//-------------------------------------------------
+
+void mos6530_base_t::pa_w(int bit, int state)
+{
+ if (LOG) logerror("%s %s %s '%s' Port A Data Bit %u State %u\n", machine().time().as_string(), machine().describe_context(), name(), tag(), bit, state);
+
+ m_pa_in &= ~(1 << bit);
+ m_pa_in |= (state << bit);
+
+ edge_detect();
+}
+
+
+//-------------------------------------------------
+// pb_w -
+//-------------------------------------------------
+
+void mos6530_base_t::pb_w(int bit, int state)
+{
+ if (LOG) logerror("%s %s %s '%s' Port B Data Bit %u State %u\n", machine().time().as_string(), machine().describe_context(), name(), tag(), bit, state);
+
+ m_pb_in &= ~(1 << bit);
+ m_pb_in |= (state << bit);
+}
+
+
+//-------------------------------------------------
+// pa_data_r -
+//-------------------------------------------------
+
+READ8_MEMBER( mos6530_base_t::pa_data_r )
+{
+ UINT8 in = 0;
+
+ if (m_in_pa_cb.isnull())
+ {
+ in |= (m_in_pa0_cb.isnull() ? BIT(m_pa_in, 0) : m_in_pa0_cb());
+ in |= (m_in_pa1_cb.isnull() ? BIT(m_pa_in, 1) : m_in_pa1_cb()) << 1;
+ in |= (m_in_pa2_cb.isnull() ? BIT(m_pa_in, 2) : m_in_pa2_cb()) << 2;
+ in |= (m_in_pa3_cb.isnull() ? BIT(m_pa_in, 3) : m_in_pa3_cb()) << 3;
+ in |= (m_in_pa4_cb.isnull() ? BIT(m_pa_in, 4) : m_in_pa4_cb()) << 4;
+ in |= (m_in_pa5_cb.isnull() ? BIT(m_pa_in, 5) : m_in_pa5_cb()) << 5;
+ in |= (m_in_pa6_cb.isnull() ? BIT(m_pa_in, 6) : m_in_pa6_cb()) << 6;
+ in |= (m_in_pa7_cb.isnull() ? BIT(m_pa_in, 7) : m_in_pa7_cb()) << 7;
+ }
+ else
+ {
+ in = m_in_pa_cb();
+ }
+
+ UINT8 out = m_pa_out;
+ UINT8 ddr_out = m_pa_ddr;
+ UINT8 ddr_in = m_pa_ddr ^ 0xff;
+ UINT8 data = (out & ddr_out) | (in & ddr_in);
+
+ if (LOG) logerror("%s %s %s '%s' Port A Data In %02x\n", machine().time().as_string(), machine().describe_context(), name(), tag(), data);
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// pa_data_w -
+//-------------------------------------------------
+
+WRITE8_MEMBER( mos6530_base_t::pa_data_w )
+{
+ m_pa_out = data;
+
+ if (LOG) logerror("%s %s %s '%s' Port A Data Out %02x\n", machine().time().as_string(), machine().describe_context(), name(), tag(), data);
+
+ update_pa();
+ edge_detect();
+}
+
+
+//-------------------------------------------------
+// pa_ddr_w -
+//-------------------------------------------------
+
+WRITE8_MEMBER( mos6530_base_t::pa_ddr_w )
+{
+ m_pa_ddr = data;
+
+ if (LOG) logerror("%s %s %s '%s' Port A DDR %02x\n", machine().time().as_string(), machine().describe_context(), name(), tag(), data);
+
+ update_pa();
+ edge_detect();
+}
+
+
+//-------------------------------------------------
+// pb_data_r -
+//-------------------------------------------------
+
+READ8_MEMBER( mos6530_base_t::pb_data_r )
+{
+ UINT8 in = 0;
+
+ if (m_in_pb_cb.isnull())
+ {
+ in |= (m_in_pb0_cb.isnull() ? BIT(m_pb_in, 0) : m_in_pb0_cb());
+ in |= (m_in_pb1_cb.isnull() ? BIT(m_pb_in, 1) : m_in_pb1_cb()) << 1;
+ in |= (m_in_pb2_cb.isnull() ? BIT(m_pb_in, 2) : m_in_pb2_cb()) << 2;
+ in |= (m_in_pb3_cb.isnull() ? BIT(m_pb_in, 3) : m_in_pb3_cb()) << 3;
+ in |= (m_in_pb4_cb.isnull() ? BIT(m_pb_in, 4) : m_in_pb4_cb()) << 4;
+ in |= (m_in_pb5_cb.isnull() ? BIT(m_pb_in, 5) : m_in_pb5_cb()) << 5;
+ in |= (m_in_pb6_cb.isnull() ? BIT(m_pb_in, 6) : m_in_pb6_cb()) << 6;
+ in |= (m_in_pb7_cb.isnull() ? BIT(m_pb_in, 7) : m_in_pb7_cb()) << 7;
+ }
+ else
+ {
+ in = m_in_pb_cb();
+ }
+
+ UINT8 out = m_pb_out;
+ UINT8 ddr_out = m_pb_ddr;
+ UINT8 ddr_in = m_pb_ddr ^ 0xff;
+ UINT8 data = (out & ddr_out) | (in & ddr_in);
+
+ if (LOG) logerror("%s %s %s '%s' Port B Data In %02x\n", machine().time().as_string(), machine().describe_context(), name(), tag(), data);
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// pb_data_w -
+//-------------------------------------------------
+
+WRITE8_MEMBER( mos6530_base_t::pb_data_w )
+{
+ m_pb_out = data;
+
+ if (LOG) logerror("%s %s %s '%s' Port B Data Out %02x\n", machine().time().as_string(), machine().describe_context(), name(), tag(), data);
+
+ update_pb();
+}
+
+
+//-------------------------------------------------
+// pb_ddr_w -
+//-------------------------------------------------
+
+WRITE8_MEMBER( mos6530_base_t::pb_ddr_w )
+{
+ m_pb_ddr = data;
+
+ if (LOG) logerror("%s %s %s '%s' Port B DDR %02x\n", machine().time().as_string(), machine().describe_context(), name(), tag(), data);
+
+ update_pb();
+}
+
+
+//-------------------------------------------------
+// timer_r -
+//-------------------------------------------------
+
+READ8_MEMBER( mos6530_base_t::timer_off_r )
+{
+ if (space.debugger_access())
+ return 0;
+
+ return timer_r(false);
+}
+
+READ8_MEMBER( mos6530_base_t::timer_on_r )
+{
+ if (space.debugger_access())
+ return 0;
+
+ return timer_r(true);
+}
+
+UINT8 mos6530_base_t::timer_r(bool ie)
+{
+ UINT8 data = 0;
+
+ live_sync();
+
+ m_ie_timer = ie;
+ if (cur_live.tm_irq != machine().time()) {
+ m_irq_timer = false;
+ }
+ update_irq();
+
+ data = cur_live.value;
+
+ if (LOG_TIMER) logerror("%s %s %s '%s' Timer read %02x IE %u\n", machine().time().as_string(), machine().describe_context(), name(), tag(), data, m_ie_timer ? 1 : 0);
+
+ checkpoint();
+ live_run();
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// irq_r -
+//-------------------------------------------------
+
+READ8_MEMBER( mos6530_base_t::irq_r )
+{
+ UINT8 data = get_irq_flags();
+
+ if (!space.debugger_access()) {
+ if (m_irq_edge) {
+ m_irq_edge = false;
+ update_irq();
+ }
+ }
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// timer_w -
+//-------------------------------------------------
+
+WRITE8_MEMBER( mos6530_base_t::timer_off_w )
+{
+ timer_w(offset, data, false);
+}
+
+WRITE8_MEMBER( mos6530_base_t::timer_on_w )
+{
+ timer_w(offset, data, true);
+}
+
+void mos6530_base_t::timer_w(offs_t offset, UINT8 data, bool ie)
+{
+ live_sync();
+
+ m_timer = data;
+
+ switch (offset & 0x03) {
+ case 0: m_prescale = 1; break;
+ case 1: m_prescale = 8; break;
+ case 2: m_prescale = 64; break;
+ case 3: m_prescale = 1024; break;
+ }
+
+ m_ie_timer = ie;
+ if (cur_live.tm_irq != machine().time()) {
+ m_irq_timer = false;
+ }
+ update_irq();
+
+ if (LOG_TIMER) logerror("%s %s %s '%s' Timer value %02x prescale %u IE %u\n", machine().time().as_string(), machine().describe_context(), name(), tag(), data, m_prescale, m_ie_timer ? 1 : 0);
+
+ checkpoint();
+
+ if (cur_live.state != IDLE) {
+ live_abort();
+ }
+
+ live_start();
+ live_run();
+}
+
+
+//-------------------------------------------------
+// edge_w -
+//-------------------------------------------------
+
+WRITE8_MEMBER( mos6530_base_t::edge_w )
+{
+ m_pa7_dir = BIT(data, 0);
+ m_ie_edge = BIT(data, 1) ? false : true;
+
+ if (LOG) logerror("%s %s %s '%s' %s edge-detect, %s interrupt\n", machine().time().as_string(), machine().describe_context(), name(), tag(), m_pa7_dir ? "positive" : "negative", m_ie_edge ? "enable" : "disable");
+}
+
+
+//-------------------------------------------------
+// live_start -
+//-------------------------------------------------
+
+void mos6530_base_t::live_start()
+{
+ cur_live.period = attotime::from_ticks(m_prescale, clock());
+ cur_live.tm = machine().time() + attotime::from_hz(clock());
+ cur_live.state = RUNNING;
+ cur_live.next_state = -1;
+
+ cur_live.value = m_timer;
+
+ checkpoint();
+
+ live_run();
+}
+
+void mos6530_base_t::checkpoint()
+{
+ checkpoint_live = cur_live;
+}
+
+void mos6530_base_t::rollback()
+{
+ cur_live = checkpoint_live;
+}
+
+void mos6530_base_t::live_delay(int state)
+{
+ cur_live.next_state = state;
+ if(cur_live.tm != machine().time())
+ t_gen->adjust(cur_live.tm - machine().time());
+ else
+ live_sync();
+}
+
+void mos6530_base_t::live_sync()
+{
+ if(!cur_live.tm.is_never()) {
+ if(cur_live.tm > machine().time()) {
+ rollback();
+ live_run(machine().time());
+ } else {
+ if(cur_live.next_state != -1) {
+ cur_live.state = cur_live.next_state;
+ cur_live.next_state = -1;
+ }
+ if(cur_live.state == IDLE) {
+ cur_live.tm = attotime::never;
+ }
+ }
+ cur_live.next_state = -1;
+ checkpoint();
+ }
+}
+
+void mos6530_base_t::live_abort()
+{
+ if(!cur_live.tm.is_never() && cur_live.tm > machine().time()) {
+ rollback();
+ live_run(machine().time());
+ }
+
+ cur_live.tm = attotime::never;
+ cur_live.state = IDLE;
+ cur_live.next_state = -1;
+ cur_live.tm_irq = attotime::never;
+}
+
+void mos6530_base_t::live_run(const attotime &limit)
+{
+ if(cur_live.state == IDLE || cur_live.next_state != -1)
+ return;
+
+ for(;;) {
+ switch(cur_live.state) {
+ case RUNNING: {
+ if (cur_live.tm > limit)
+ return;
+
+ cur_live.value--;
+
+ if (cur_live.value == 0xff) {
+ live_delay(RUNNING_SYNCPOINT);
+ return;
+ } else {
+ if (LOG_TIMER) logerror("%s %s '%s' timer %02x\n", cur_live.tm.as_string(), name(), tag(), cur_live.value);
+
+ cur_live.tm += cur_live.period;
+ }
+ break;
+ }
+
+ case RUNNING_SYNCPOINT: {
+ if (LOG_TIMER) logerror("%s %s '%s' timer %02x interrupt\n", cur_live.tm.as_string(), name(), tag(), cur_live.value);
+
+ cur_live.tm_irq = cur_live.tm;
+ m_irq_timer = true;
+ update_irq();
+
+ checkpoint();
+
+ cur_live.state = RUNNING_AFTER_INTERRUPT;
+ cur_live.period = attotime::from_hz(clock());
+ cur_live.tm += cur_live.period;
+ break;
+ }
+
+ case RUNNING_AFTER_INTERRUPT: {
+ if (cur_live.tm > limit)
+ return;
+
+ cur_live.value--;
+
+ if (LOG_TIMER) logerror("%s %s '%s' timer %02x\n", cur_live.tm.as_string(), name(), tag(), cur_live.value);
+
+ if (!cur_live.value) {
+ cur_live.state = IDLE;
+ return;
+ }
+
+ cur_live.tm += cur_live.period;
+ break;
+ }
+ }
+ }
+}