diff options
Diffstat (limited to 'src/devices/machine/tube.cpp')
-rw-r--r-- | src/devices/machine/tube.cpp | 92 |
1 files changed, 60 insertions, 32 deletions
diff --git a/src/devices/machine/tube.cpp b/src/devices/machine/tube.cpp index b1490283fd9..74093398c33 100644 --- a/src/devices/machine/tube.cpp +++ b/src/devices/machine/tube.cpp @@ -13,7 +13,7 @@ **********************************************************************/ #include "emu.h" -#include "machine/tube.h" +#include "tube.h" @@ -29,12 +29,13 @@ DEFINE_DEVICE_TYPE(TUBE, tube_device, "tube", "Acorn Tube ULA") // bbc_tube_slot_device - constructor //------------------------------------------------- -tube_device::tube_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : - device_t(mconfig, TUBE, tag, owner, clock), - m_hirq_handler(*this), - m_pnmi_handler(*this), - m_pirq_handler(*this), - m_drq_handler(*this) +tube_device::tube_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, TUBE, tag, owner, clock) + , m_hirq_handler(*this) + , m_pnmi_handler(*this) + , m_pirq_handler(*this) + , m_prst_handler(*this) + , m_drq_handler(*this) { } @@ -45,11 +46,21 @@ tube_device::tube_device(const machine_config &mconfig, const char *tag, device_ void tube_device::device_start() { - // resolve callbacks - m_hirq_handler.resolve_safe(); - m_pnmi_handler.resolve_safe(); - m_pirq_handler.resolve_safe(); - m_drq_handler.resolve_safe(); + // register for state saving + save_item(NAME(m_ph1)); + save_item(NAME(m_ph2)); + save_item(NAME(m_ph3)); + save_item(NAME(m_ph4)); + save_item(NAME(m_hp1)); + save_item(NAME(m_hp2)); + save_item(NAME(m_hp3)); + save_item(NAME(m_hp4)); + save_item(NAME(m_hstat)); + save_item(NAME(m_pstat)); + save_item(NAME(m_r1stat)); + save_item(NAME(m_ph1pos)); + save_item(NAME(m_ph3pos)); + save_item(NAME(m_hp3pos)); } @@ -59,9 +70,14 @@ void tube_device::device_start() void tube_device::device_reset() { + m_r1stat = 0; + soft_reset(); +} + +void tube_device::soft_reset() +{ m_ph1pos = m_hp3pos = 0; m_ph3pos = 1; - m_r1stat = 0; m_hstat[0] = m_hstat[1] = m_hstat[3] = 0x40; m_hstat[2] = 0xc0; m_pstat[0] = m_pstat[1] = m_pstat[2] = m_pstat[3] = 0x40; @@ -89,7 +105,7 @@ uint8_t tube_device::host_r(offs_t offset) data = (m_hstat[0] & 0xc0) | m_r1stat; break; - case 1: /* Register 1 */ + case 1: /* Register 1 (24 byte FIFO read only) */ data = m_ph1[0]; if (!machine().side_effects_disabled()) { @@ -104,7 +120,7 @@ uint8_t tube_device::host_r(offs_t offset) data = m_hstat[1]; break; - case 3: /* Register 2 */ + case 3: /* Register 2 (1 byte read only) */ data = m_ph2; if (BIT(m_hstat[1], 7) && !machine().side_effects_disabled()) { @@ -117,7 +133,7 @@ uint8_t tube_device::host_r(offs_t offset) data = m_hstat[2]; break; - case 5: /* Register 3 */ + case 5: /* Register 3 (2 byte FIFO only) */ data = m_ph3[0]; if ((m_ph3pos > 0) && !machine().side_effects_disabled()) { @@ -132,7 +148,7 @@ uint8_t tube_device::host_r(offs_t offset) data = m_hstat[3]; break; - case 7: /* Register 4 */ + case 7: /* Register 4 (1 byte read only) */ data = m_ph4; if (BIT(m_hstat[3], 7) && !machine().side_effects_disabled()) { @@ -151,26 +167,38 @@ void tube_device::host_w(offs_t offset, uint8_t data) switch (offset & 0x07) { case 0: /* Status flags */ + m_hstat[0] = (m_hstat[0] & 0xc0) | (data & 0x3f); if (BIT(data, 7)) + { m_r1stat |= (data & 0x3f); + if (BIT(data, 6)) + { + soft_reset(); + } + } else + { m_r1stat &= ~(data & 0x3f); - m_hstat[0] = (m_hstat[0] & 0xc0) | (data & 0x3f); + } + if (BIT(data, 5)) + { + m_prst_handler(BIT(data, 7) ? ASSERT_LINE : CLEAR_LINE); + } break; - case 1: /* Register 1 */ + case 1: /* Register 1 (1 byte write only) */ m_hp1 = data; m_pstat[0] |= 0x80; m_hstat[0] &= ~0x40; break; - case 3: /* Register 2 */ + case 3: /* Register 2 (1 byte write only) */ m_hp2 = data; m_pstat[1] |= 0x80; m_hstat[1] &= ~0x40; break; - case 5: /* Register 3 */ + case 5: /* Register 3 (2 byte FIFO write only) */ if (BIT(m_r1stat, 4)) { if (m_hp3pos < 2) @@ -190,27 +218,27 @@ void tube_device::host_w(offs_t offset, uint8_t data) } break; - case 7: /* Register 4 */ + case 7: /* Register 4 (1 byte write only) */ m_hp4 = data; m_pstat[3] |= 0x80; m_hstat[3] &= ~0x40; break; } - update_interrupts(); } + uint8_t tube_device::parasite_r(offs_t offset) { uint8_t data = 0x00; switch (offset & 0x07) { - case 0: /*Register 1 flags */ + case 0: /* Status and Register 1 flags */ data = m_pstat[0] | m_r1stat; break; - case 1: /* Register 1 */ + case 1: /* Register 1 (1 byte read only) */ data = m_hp1; if (BIT(m_pstat[0], 7) && !machine().side_effects_disabled()) { @@ -223,7 +251,7 @@ uint8_t tube_device::parasite_r(offs_t offset) data = m_pstat[1]; break; - case 3: /* Register 2 */ + case 3: /* Register 2 (1 byte read only) */ data = m_hp2; if (BIT(m_pstat[1], 7) && !machine().side_effects_disabled()) { @@ -236,7 +264,7 @@ uint8_t tube_device::parasite_r(offs_t offset) data = m_pstat[2]; break; - case 5: /* Register 3 */ + case 5: /* Register 3 (2 byte FIFO read only) */ data = m_hp3[0]; if ((m_hp3pos > 0) && !machine().side_effects_disabled()) { @@ -254,7 +282,7 @@ uint8_t tube_device::parasite_r(offs_t offset) data = m_pstat[3]; break; - case 7: /* Register 4 */ + case 7: /* Register 4 (1 byte read only) */ data = m_hp4; if (BIT(m_pstat[3], 7) && !machine().side_effects_disabled()) { @@ -272,7 +300,7 @@ void tube_device::parasite_w(offs_t offset, uint8_t data) { switch (offset & 0x07) { - case 1: /* Register 1 */ + case 1: /* Register 1 (24 byte FIFO write only) */ if (m_ph1pos < 24) { m_ph1[m_ph1pos++] = data; @@ -282,13 +310,13 @@ void tube_device::parasite_w(offs_t offset, uint8_t data) } break; - case 3: /* Register 2 */ + case 3: /* Register 2 (1 byte write only) */ m_ph2 = data; m_hstat[1] |= 0x80; m_pstat[1] &= ~0x40; break; - case 5: /* Register 3 */ + case 5: /* Register 3 (2 byte FIFO write only) */ if (BIT(m_r1stat, 4)) { if (m_ph3pos < 2) @@ -308,7 +336,7 @@ void tube_device::parasite_w(offs_t offset, uint8_t data) } break; - case 7: /* Register 4 */ + case 7: /* Register 4 (1 byte write only) */ m_ph4 = data; m_hstat[3] |= 0x80; m_pstat[3] &= ~0x40; |