saitek_osa: add skeleton device for Sparc module [hap, Berger]

scripts/src/bus.lua

@@ -4455,6 +4455,8 @@ if (BUSES["SAITEK_OSA"]~=null) then
 		MAME_DIR .. "src/devices/bus/saitek_osa/modules.h",
 		MAME_DIR .. "src/devices/bus/saitek_osa/maestroa.cpp",
 		MAME_DIR .. "src/devices/bus/saitek_osa/maestroa.h",
+		MAME_DIR .. "src/devices/bus/saitek_osa/sparc.cpp",
+		MAME_DIR .. "src/devices/bus/saitek_osa/sparc.h",
 	}
 end
 

src/devices/bus/saitek_osa/maestroa.cpp

@@ -3,7 +3,18 @@
 // thanks-to:Berger
 /***************************************************************************
 
-Saitek OSA Module: Maestro A
+Saitek OSA Module: Kasparov Maestro A (SciSys, 1986)
+
+The chess engine revision is in-between Kaplan's Stratos and Turbostar.
+
+Hardware notes:
+- PCB label: M6L-PE-012 REV.2
+- R65C02P4 @ 4MHz / 5.67MHz / 6MHz
+- 32KB ROM (D27C256)
+- 8KB RAM (HM6264LP-15)
+- 3 more sockets, one for KSO expansion ROM, 2 unused
+
+The PCB is not compatible for upgrading to newer Maestro versions.
 
 TODO:
 - does not work if cpu speed is 4MHz

src/devices/bus/saitek_osa/maestroa.h

@@ -2,7 +2,7 @@
 // copyright-holders:hap
 /***************************************************************************
 
-    Saitek OSA Module: Maestro A
+    Saitek OSA Module: Kasparov Maestro A
 
 ***************************************************************************/
 

src/devices/bus/saitek_osa/modules.cpp

@@ -10,8 +10,10 @@
 #include "modules.h"
 
 #include "maestroa.h"
+#include "sparc.h"
 
 void saitekosa_expansion_modules(device_slot_interface &device)
 {
 	device.option_add("maestroa", OSA_MAESTROA);
+	device.option_add("sparc", OSA_SPARC);
 }

src/devices/bus/saitek_osa/sparc.cpp

@@ -0,0 +1,99 @@
+// license:BSD-3-Clause
+// copyright-holders:hap
+// thanks-to:Berger
+/***************************************************************************
+
+Saitek OSA Module: Kasparov Sparc (1993)
+
+The chess engine is by the Spracklen's. Their last, and also their strongest.
+
+Hardware notes:
+- Fujitsu MB86930 SPARClite @ 20MHz (fan cooled)
+- 256KB ROM (4*AMD AM27C512)
+- 1MB DRAM (8*NEC 424256-60), expandable to 4MB
+
+TODO:
+- skeleton device, missing SPARClite emulation, maybe only needs the MMU?
+
+***************************************************************************/
+
+#include "emu.h"
+#include "sparc.h"
+
+
+DEFINE_DEVICE_TYPE(OSA_SPARC, saitekosa_sparc_device, "osa_sparc", "Sparc")
+
+
+//-------------------------------------------------
+//  initialization
+//-------------------------------------------------
+
+saitekosa_sparc_device::saitekosa_sparc_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) :
+	device_t(mconfig, OSA_SPARC, tag, owner, clock),
+	device_saitekosa_expansion_interface(mconfig, *this),
+	m_maincpu(*this, "maincpu")
+{ }
+
+void saitekosa_sparc_device::device_start()
+{
+}
+
+void saitekosa_sparc_device::device_reset()
+{
+}
+
+
+//-------------------------------------------------
+//  rom_region - device-specific ROM region
+//-------------------------------------------------
+
+ROM_START( sparc )
+	ROM_REGION32_BE(0x40000, "maincpu", 0)
+	ROM_LOAD32_BYTE("sm16b_512.u5",  0x000000, 0x10000, CRC(96bca59d) SHA1(2c7e693d0cdf69b6e566c6dd03bd24d39e32aa82) )
+	ROM_LOAD32_BYTE("sm16b_512.u4",  0x000001, 0x10000, CRC(15dd621d) SHA1(e8f7404e84fe027b086fcb918fbcaf2ce4203567) )
+	ROM_LOAD32_BYTE("sm16b_512.u3",  0x000002, 0x10000, CRC(3201c6e4) SHA1(9a209219a0ab4b4f874381a16773bf33f8f7ba25) )
+	ROM_LOAD32_BYTE("sm16b_512a.u2", 0x000003, 0x10000, CRC(56dedec7) SHA1(4f9d37e0ca639f892a574aa10a3fb42bba9b82c6) )
+
+	ROM_REGION(0x1000, "pals", 0)
+	ROM_LOAD("palce16v8h.u23.jed", 0x0000, 0x0c25, CRC(de79fabc) SHA1(27e01ec405e261109dbe10c254b7127eda0f1886) )
+	ROM_LOAD("palce16v8h.u32.jed", 0x0000, 0x0c25, CRC(422b66c8) SHA1(44b3394e0586c126ee95129c65e6692ffc01fa8e) )
+ROM_END
+
+const tiny_rom_entry *saitekosa_sparc_device::device_rom_region() const
+{
+	return ROM_NAME(sparc);
+}
+
+
+//-------------------------------------------------
+//  device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void saitekosa_sparc_device::device_add_mconfig(machine_config &config)
+{
+	// basic machine hardware
+#if 0
+	SPARCV8(config, m_maincpu, 20_MHz_XTAL);
+	m_maincpu->set_addrmap(0, &saitekosa_sparc_device::main_map);
+	m_maincpu->set_mmu(nullptr);
+#endif
+}
+
+
+//-------------------------------------------------
+//  internal i/o
+//-------------------------------------------------
+
+void saitekosa_sparc_device::main_map(address_map &map)
+{
+}
+
+
+//-------------------------------------------------
+//  host i/o
+//-------------------------------------------------
+
+u8 saitekosa_sparc_device::data_r()
+{
+	return 0xff;
+}

src/devices/bus/saitek_osa/sparc.h

@@ -0,0 +1,43 @@
+// license:BSD-3-Clause
+// copyright-holders:hap
+/***************************************************************************
+
+    Saitek OSA Module: Kasparov Sparc
+
+***************************************************************************/
+
+#ifndef MAME_BUS_SAITEKOSA_SPARC_H
+#define MAME_BUS_SAITEKOSA_SPARC_H
+
+#pragma once
+
+#include "expansion.h"
+
+#include "cpu/sparc/sparc.h"
+
+
+class saitekosa_sparc_device : public device_t, public device_saitekosa_expansion_interface
+{
+public:
+	// construction/destruction
+	saitekosa_sparc_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+	// from host
+	virtual u8 data_r() override;
+
+protected:
+	virtual const tiny_rom_entry *device_rom_region() const override;
+	virtual void device_add_mconfig(machine_config &config) override;
+	virtual void device_start() override;
+	virtual void device_reset() override;
+
+private:
+	optional_device<sparcv8_device> m_maincpu;
+
+	void main_map(address_map &map);
+};
+
+
+DECLARE_DEVICE_TYPE(OSA_SPARC, saitekosa_sparc_device)
+
+#endif // MAME_BUS_SAITEKOSA_SPARC_H

src/mame/drivers/saitek_leonardo.cpp

@@ -42,8 +42,10 @@ Expansion modules released:
 - Sparc (SPARClite, Spracklen's)
 
 TODO:
+- OSA module comms is not completely understood
 - OSA PC link (probably uses MCU serial interface)
-- add nvram
+- add power-off
+- add nvram (MCU port $14?)
 - finish internal artwork
 
 ******************************************************************************/
@@ -110,14 +112,12 @@ private:
 
 	u8 m_inp_mux = 0;
 	u8 m_led_data[2] = { 0, 0 };
-	bool m_stb_enable = false;
 };
 
 void leo_state::machine_start()
 {
 	save_item(NAME(m_inp_mux));
 	save_item(NAME(m_led_data));
-	save_item(NAME(m_stb_enable));
 }
 
 
@@ -167,7 +167,7 @@ void leo_state::unk_w(u8 data)
 void leo_state::exp_stb_w(int state)
 {
 	// STB-P to P5 IS
-	m_maincpu->set_input_line(M6801_IS_LINE, (state && m_stb_enable) ? CLEAR_LINE : ASSERT_LINE);
+	m_maincpu->set_input_line(M6801_IS_LINE, state ? CLEAR_LINE : ASSERT_LINE);
 }
 
 
@@ -206,11 +206,8 @@ void leo_state::p5_w(u8 data)
 	// d2: expansion NMI-P
 	m_expansion->nmi_w(BIT(data, 2));
 
-	// d3: enable expansion STB signal
-	m_stb_enable = bool(data & 8);
-
-	// d5: expansion ACK-P
-	m_expansion->ack_w(BIT(data, 5));
+	// d3,d5: expansion ACK-P?
+	m_expansion->ack_w(BIT(data, 3) & BIT(data, 5));
 
 	// d6,d7: chessboard led row data
 	m_led_data[0] = (m_led_data[0] & 3) | (~data >> 4 & 0xc);

src/mame/drivers/saitek_renaissance.cpp

@@ -22,7 +22,7 @@ The LCD screen is fairly large, it's the same one as in Saitek Simultano,
 so a chessboard display + 7seg info.
 
 TODO:
-- not sure about comm/module leds
+- not sure about comm/module leds, where is the module led?
 - fart noise at boot if osa module is inserted
 - finish internal artwork
 - make it a subdriver of saitek_leonardo.cpp? or too many differences
@@ -222,8 +222,8 @@ void ren_state::p5_w(u8 data)
 	// d1: expansion NMI-P
 	m_expansion->nmi_w(BIT(data, 1));
 
-	// d5: expansion ACK-P
-	m_expansion->ack_w(BIT(data, 5));
+	// d3,d5: expansion ACK-P?
+	m_expansion->ack_w(BIT(data, 3) & BIT(data, 5));
 
 	// other: ?
 }