a2bus: Add emulation of ADS Noisemaker II board

scripts/src/bus.lua

@@ -2873,6 +2873,8 @@ if (BUSES["A2BUS"]~=null) then
 		MAME_DIR .. "src/devices/bus/a2bus/mouse.h",
 		MAME_DIR .. "src/devices/bus/a2bus/nippelclock.cpp",
 		MAME_DIR .. "src/devices/bus/a2bus/nippelclock.h",
+		MAME_DIR .. "src/devices/bus/a2bus/noisemaker.cpp",
+		MAME_DIR .. "src/devices/bus/a2bus/noisemaker.h",
 		MAME_DIR .. "src/devices/bus/a2bus/pc_xporter.cpp",
 		MAME_DIR .. "src/devices/bus/a2bus/pc_xporter.h",
 		MAME_DIR .. "src/devices/bus/a2bus/prodosromdrive.cpp",

src/devices/bus/a2bus/cards.cpp

@@ -54,6 +54,7 @@
 #include "lancegs.h"
 #include "laser128.h"
 #include "mouse.h"
+#include "noisemaker.h"
 #include "pc_xporter.h"
 #include "prodosromdrive.h"
 #include "q68.h"
@@ -138,6 +139,7 @@ void apple2_cards(device_slot_interface &device)
 	device.option_add("applesurance", A2BUS_APPLESURANCE);     // Applesurance Diagnostic Controller
 //  device.option_add("magicmusician", A2BUS_MAGICMUSICIAN);   // Magic Musician Card
 	device.option_add("byte8251", A2BUS_BYTE8251);             // BYTE Magazine 8251 serial card
+	device.option_add("noisemaker", A2BUS_NOISEMAKER);         // ADS Noisemaker II
 	device.option_add("suprterm", A2BUS_SUPRTERMINAL);         // M&R Enterprises SUP'R'TERMINAL 80-column card
 	device.option_add("uniprint", A2BUS_UNIPRINT);             // Videx Uniprint parallel printer card
 	device.option_add("ccs7710", A2BUS_CCS7710);               // California Computer Systems Model 7710 Asynchronous Serial Interface
@@ -209,6 +211,7 @@ void apple2e_cards(device_slot_interface &device)
 	device.option_add("ceyes2", A2BUS_COMPUTEREYES2);          // ComputerEyes/2 Video Digitizer
 	device.option_add("applesurance", A2BUS_APPLESURANCE);     // Applesurance Diagnostic Controller
 	device.option_add("byte8251", A2BUS_BYTE8251);             // BYTE Magazine 8251 serial card
+	device.option_add("noisemaker", A2BUS_NOISEMAKER);         // ADS Noisemaker II
 	device.option_add("cmsscsi", A2BUS_CMSSCSI);               // CMS Apple II SCSI Card
 	device.option_add("uthernet", A2BUS_UTHERNET);             // A2RetroSystems Uthernet card
 	device.option_add("sider2", A2BUS_SIDER2);                 // Advanced Tech Systems / First Class Peripherals Sider 2 SASI card
@@ -280,6 +283,7 @@ void apple2gs_cards(device_slot_interface &device)
 //  device.option_add("magicmusician", A2BUS_MAGICMUSICIAN);   // Magic Musician Card
 //  device.option_add("pcxport", A2BUS_PCXPORTER);             // Applied Engineering PC Transporter
 	device.option_add("byte8251", A2BUS_BYTE8251);             // BYTE Magazine 8251 serial card
+	device.option_add("noisemaker", A2BUS_NOISEMAKER);         // ADS Noisemaker II
 //  device.option_add("hostram", A2BUS_HOSTRAM);               // Slot 7 RAM for GS Plus host protocol
 //  device.option_add("ramfast", A2BUS_RAMFAST);               // C.V. Technologies RAMFast SCSI card
 	device.option_add("cmsscsi", A2BUS_CMSSCSI);               // CMS Apple II SCSI Card

src/devices/bus/a2bus/noisemaker.cpp

@@ -0,0 +1,86 @@
+// license:BSD-3-Clause
+// copyright-holders:AJR
+/**********************************************************************
+
+    ADS (Ackerman Digital Systems) Noisemaker II
+
+    This board provides a very simple interface to a AY-3-8910
+    Programmable Sound Generator through two I/O addresses, and has
+    a dedicated audio amplifier and speaker connector for the combined
+    output of its three channels. The manual gives the option of using
+    8T26 inverting buffers instead of 8T28 noninverting buffers, which 
+    changes the programming interface somewhat, though both schematics
+    and actual boards have 8T28s.
+
+    The PSG's two 8-bit parallel ports are not emulated here, though
+    the actual PCB brings all 16 signals out to a generic DIP socket.
+
+**********************************************************************/
+
+#include "emu.h"
+#include "noisemaker.h"
+
+#include "sound/ay8910.h"
+#include "speaker.h"
+
+
+namespace {
+
+class a2bus_noisemaker_device : public device_t, public device_a2bus_card_interface
+{
+public:
+	// construction/destruction
+	a2bus_noisemaker_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+protected:
+	// device-level overrides
+	virtual void device_start() override;
+	virtual void device_add_mconfig(machine_config &config) override;
+
+	// device_a2bus_card_interface overrides
+	virtual u8 read_c0nx(u8 offset) override;
+	virtual void write_c0nx(u8 offset, u8 data) override;
+	virtual bool take_c800() override { return false; }
+
+private:
+	// object finders
+	required_device<ay8910_device> m_psg;
+};
+
+a2bus_noisemaker_device::a2bus_noisemaker_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+	: device_t(mconfig, A2BUS_NOISEMAKER, tag, owner, clock)
+	, device_a2bus_card_interface(mconfig, *this)
+	, m_psg(*this, "psg")
+{
+}
+
+void a2bus_noisemaker_device::device_start()
+{
+}
+
+u8 a2bus_noisemaker_device::read_c0nx(u8 offset)
+{
+	if (BIT(offset, 0))
+		return m_psg->data_r();
+	else
+		return 0xff; // BDIR1 = BC1 = 0, so this should be open bus
+}
+
+void a2bus_noisemaker_device::write_c0nx(u8 offset, u8 data)
+{
+	m_psg->address_data_w(offset & 1, data);
+}
+
+void a2bus_noisemaker_device::device_add_mconfig(machine_config &config)
+{
+	AY8910(config, m_psg, 1021800); // CLK tied to ϕ1 signal from bus pin 38
+	m_psg->add_route(ALL_OUTPUTS, "speaker", 0.5);
+
+	SPEAKER(config, "speaker").front_center();
+}
+
+} // aonymous namespace
+
+
+// device type definition
+DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_NOISEMAKER, device_a2bus_card_interface, a2bus_noisemaker_device, "a2bus_noisemaker", "ADS Noisemaker II")

src/devices/bus/a2bus/noisemaker.h

@@ -0,0 +1,14 @@
+// license:BSD-3-Clause
+// copyright-holders:AJR
+
+#ifndef MAME_BUS_A2BUS_NOISEMAKER_H
+#define MAME_BUS_A2BUS_NOISEMAKER_H
+
+#pragma once
+
+#include "a2bus.h"
+
+// device type declaration
+DECLARE_DEVICE_TYPE(A2BUS_NOISEMAKER, device_a2bus_card_interface)
+
+#endif // MAME_BUS_A2BUS_NOISEMAKER_H