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Diffstat (limited to 'src/devices/bus/ti99/peb/forti.cpp')
-rw-r--r-- | src/devices/bus/ti99/peb/forti.cpp | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/devices/bus/ti99/peb/forti.cpp b/src/devices/bus/ti99/peb/forti.cpp new file mode 100644 index 00000000000..b4a3836bc0d --- /dev/null +++ b/src/devices/bus/ti99/peb/forti.cpp @@ -0,0 +1,133 @@ +// license:LGPL-2.1+ +// copyright-holders:Michael Zapf +/******************************************************************************* + FORTi Sound card + + 4 x TMS9919 sound generators + 4 sound outputs; may be coupled to two stereo outputs + + Mapping: + + 1000 01xx xxxD CBA0 + + 8402: Sound chip 1 (A) + 8404: Sound chip 2 (B) + 8408: Sound chip 3 (C) + 8410: Sound chip 4 (D) + + Sound chips may be addressed in parallel: + 8406: Sound chips 1+2 + 841a: Sound chips 1+3+4 + + All sound READY lines are combined by a wired-AND as the common + READY line to the CPU. + + Michael Zapf + March 2020 + +*******************************************************************************/ + +#include "emu.h" +#include "forti.h" + +#define LOG_READY (1U<<1) + +#define VERBOSE ( LOG_GENERAL ) + +#include "logmacro.h" + +#define FORTI_GEN1_TAG "soundchip1" +#define FORTI_GEN2_TAG "soundchip2" +#define FORTI_GEN3_TAG "soundchip3" +#define FORTI_GEN4_TAG "soundchip4" + +DEFINE_DEVICE_TYPE_NS(TI99_FORTI, bus::ti99::peb, forti_device, "ti99_forti", "FORTi Sound Card") + +namespace bus { namespace ti99 { namespace peb { + +forti_device::forti_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock): + device_t(mconfig, TI99_FORTI, tag, owner, clock), + device_ti99_peribox_card_interface(mconfig, *this), + m_generator1(*this, FORTI_GEN1_TAG), + m_generator2(*this, FORTI_GEN2_TAG), + m_generator3(*this, FORTI_GEN3_TAG), + m_generator4(*this, FORTI_GEN4_TAG) +{ +} + +/* + No read access. The FORTi card does not support any reading. +*/ +READ8Z_MEMBER(forti_device::readz) +{ + return; +} + +/* + READY callbacks from the sound chips. +*/ +WRITE_LINE_MEMBER( forti_device::ready_sound ) +{ + LOGMASKED(LOG_READY, "READY (%d, %d, %d, %d)\n", m_generator1->ready_r(), + m_generator2->ready_r(), m_generator3->ready_r(), m_generator4->ready_r()); + + line_state ready = (m_generator1->ready_r() && m_generator2->ready_r() + && m_generator3->ready_r() && m_generator4->ready_r())? ASSERT_LINE : CLEAR_LINE; + + m_slot->set_ready(ready); +} + +void forti_device::write(offs_t offset, uint8_t data) +{ + // Decode for 8400-87ff + if ((offset & 0xfc01) == 0x8400) + { + // The generators can be accessed in parallel + if ((offset & 0x2)!=0) + m_generator1->write(data); + + if ((offset & 0x4)!=0) + m_generator2->write(data); + + if ((offset & 0x8)!=0) + m_generator3->write(data); + + if ((offset & 0x10)!=0) + m_generator4->write(data); + } +} + +void forti_device::device_add_mconfig(machine_config& config) +{ + // 1 and 3 are mixed to left channel + // 2 and 4 are moxed to right channel + + SPEAKER(config, "forti_left").front_left(); + SPEAKER(config, "forti_right").front_right(); + + SN94624(config, m_generator1, XTAL(3'579'545)/8); + m_generator1->ready_cb().set(FUNC(forti_device::ready_sound)); + m_generator1->add_route(ALL_OUTPUTS, "forti_left", 0.75); + + SN94624(config, m_generator2, XTAL(3'579'545)/8); + m_generator2->ready_cb().set(FUNC(forti_device::ready_sound)); + m_generator2->add_route(ALL_OUTPUTS, "forti_right", 0.75); + + SN94624(config, m_generator3, XTAL(3'579'545)/8); + m_generator3->ready_cb().set(FUNC(forti_device::ready_sound)); + m_generator3->add_route(ALL_OUTPUTS, "forti_left", 0.75); + + SN94624(config, m_generator4, XTAL(3'579'545)/8); + m_generator4->ready_cb().set(FUNC(forti_device::ready_sound)); + m_generator4->add_route(ALL_OUTPUTS, "forti_right", 0.75); +} + +void forti_device::device_start() +{ +} + +void forti_device::device_reset() +{ +} + +} } } // end namespace bus::ti99::peb
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