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diff --git a/src/devices/bus/ti99/peb/forti.cpp b/src/devices/bus/ti99/peb/forti.cpp
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+// 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 \ No newline at end of file