bbc: added preliminary slots for expansion

2025-10-05 16:50:57 +03:00 · 2016-07-17 02:48:09 +01:00 · 2016-07-17 02:48:09 +01:00 · 91fa0d4397
commit 91fa0d4397
parent 41d6025365
12 changed files with 987 additions and 4 deletions
--- a/scripts/src/bus.lua
+++ b/scripts/src/bus.lua
@ -202,6 +202,58 @@ if (BUSES["ASTROCADE"]~=null) then
 end


+---------------------------------------------------
+--
+--@src/devices/bus/bbc/analogue/analogue.h,BUSES["BBC_ANALOGUE"] = true
+---------------------------------------------------
+
+if (BUSES["BBC_ANALOGUE"]~=null) then
+	files {
+		MAME_DIR .. "src/devices/bus/bbc/analogue/analogue.cpp",
+		MAME_DIR .. "src/devices/bus/bbc/analogue/analogue.h",
+	}
+end
+
+
+---------------------------------------------------
+--
+--@src/devices/bus/bbc/1mhzbus/1mhzbus.h,BUSES["BBC_1MHZBUS"] = true
+---------------------------------------------------
+
+if (BUSES["BBC_1MHZBUS"]~=null) then
+	files {
+		MAME_DIR .. "src/devices/bus/bbc/1mhzbus/1mhzbus.cpp",
+		MAME_DIR .. "src/devices/bus/bbc/1mhzbus/1mhzbus.h",
+	}
+end
+
+
+---------------------------------------------------
+--
+--@src/devices/bus/bbc/tube/tube.h,BUSES["BBC_TUBE"] = true
+---------------------------------------------------
+
+if (BUSES["BBC_TUBE"]~=null) then
+	files {
+		MAME_DIR .. "src/devices/bus/bbc/tube/tube.cpp",
+		MAME_DIR .. "src/devices/bus/bbc/tube/tube.h",
+	}
+end
+
+
+---------------------------------------------------
+--
+--@src/devices/bus/bbc/userport/userport.h,BUSES["BBC_USERPORT"] = true
+---------------------------------------------------
+
+if (BUSES["BBC_USERPORT"]~=null) then
+	files {
+		MAME_DIR .. "src/devices/bus/bbc/userport/userport.cpp",
+		MAME_DIR .. "src/devices/bus/bbc/userport/userport.h",
+	}
+end
+
+
 ---------------------------------------------------
 --
 --@src/devices/bus/bw2/exp.h,BUSES["BW2"] = true
--- a/scripts/target/mame/mess.lua
+++ b/scripts/target/mame/mess.lua
@ -603,6 +603,10 @@ BUSES["APF"] = true
 BUSES["APRICOT_EXPANSION"] = true
 BUSES["ARCADIA"] = true
 BUSES["ASTROCADE"] = true
+BUSES["BBC_ANALOGUE"] = true
+BUSES["BBC_1MHZBUS"] = true
+BUSES["BBC_TUBE"] = true
+BUSES["BBC_USERPORT"] = true
 BUSES["BML3"] = true
 BUSES["BW2"] = true
 BUSES["C64"] = true
--- a/src/devices/bus/bbc/1mhzbus/1mhzbus.cpp
+++ b/src/devices/bus/bbc/1mhzbus/1mhzbus.cpp
@ -0,0 +1,112 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+    BBC 1MHz Bus emulation
+
+**********************************************************************/
+
+#include "1mhzbus.h"
+
+
+//**************************************************************************
+//  DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type BBC_1MHZBUS_SLOT = &device_creator<bbc_1mhzbus_slot_device>;
+
+
+
+//**************************************************************************
+//  DEVICE BBC_1MHZBUS PORT INTERFACE
+//**************************************************************************
+
+//-------------------------------------------------
+//  device_bbc_1mhzbus_interface - constructor
+//-------------------------------------------------
+
+device_bbc_1mhzbus_interface::device_bbc_1mhzbus_interface(const machine_config &mconfig, device_t &device)
+	: device_slot_card_interface(mconfig, device)
+{
+	m_slot = dynamic_cast<bbc_1mhzbus_slot_device *>(device.owner());
+}
+
+
+//-------------------------------------------------
+//  ~device_bbc_1mhzbus_interface - destructor
+//-------------------------------------------------
+
+device_bbc_1mhzbus_interface::~device_bbc_1mhzbus_interface()
+{
+}
+
+
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+//  bbc_1mhzbus_slot_device - constructor
+//-------------------------------------------------
+
+bbc_1mhzbus_slot_device::bbc_1mhzbus_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+		device_t(mconfig, BBC_1MHZBUS_SLOT, "BBC Micro 1MHz Bus port", tag, owner, clock, "bbc_1mhzbus_slot", __FILE__),
+		device_slot_interface(mconfig, *this)
+{
+}
+
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void bbc_1mhzbus_slot_device::device_start()
+{
+	m_card = dynamic_cast<device_bbc_1mhzbus_interface *>(get_card_device());
+}
+
+
+//-------------------------------------------------
+//  device_reset - device-specific reset
+//-------------------------------------------------
+
+void bbc_1mhzbus_slot_device::device_reset()
+{
+	if (get_card_device())
+	{
+		get_card_device()->reset();
+	}
+}
+
+
+//-------------------------------------------------
+//  SLOT_INTERFACE( bbc_1mhzbus_devices )
+//-------------------------------------------------
+
+
+// slot devices
+//#include "teletext.h"
+//#include "ieee488.h"
+//#include "music500.h"
+//#include "music5000.h"
+//#include "opus3.h"
+//#include "torchg400.h"
+//#include "torchg800.h"
+//#include "beebsid.h"
+//#include "prisma3.h"
+
+
+SLOT_INTERFACE_START( bbc_1mhzbus_devices )
+//	SLOT_INTERFACE("teletext",  BBC_TELETEXT)        /* Acorn ANE01 Teletext Adapter */
+//	SLOT_INTERFACE("ieee488",   BBC_IEEE488)         /* Acorn ANK01 IEEE488 Interface */
+//	SLOT_INTERFACE("music500",  BBC_MUSIC500)        /* Acorn ANV02 Music500 */
+//	SLOT_INTERFACE("music2000", BBC_MUSIC2000)       /* Hybrid Music 2000 MIDI Interface */
+//	SLOT_INTERFACE("music3000", BBC_MUSIC3000)       /* Hybrid Music 3000 Expander */
+//	SLOT_INTERFACE("music5000", BBC_MUSIC5000)       /* Hybrid Music 5000 Synthesiser */
+//	SLOT_INTERFACE("opus3",     BBC_OPUS3)           /* Opus Challenger 3 */
+//	SLOT_INTERFACE("torchg400", BBC_TORCHG400)       /* Torch Graduate G400 */
+//	SLOT_INTERFACE("torchg800", BBC_TORCHG800)       /* Torch Graduate G800 */
+//	SLOT_INTERFACE("beebsid",   BBC_BEEBSID)         /* BeebSID */
+//	SLOT_INTERFACE("prisma3",   BBC_PRISMA3)         /* Prisma 3 - Millipede 1989 */
+SLOT_INTERFACE_END
--- a/src/devices/bus/bbc/1mhzbus/1mhzbus.h
+++ b/src/devices/bus/bbc/1mhzbus/1mhzbus.h
@ -0,0 +1,148 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+    BBC 1MHz Bus emulation
+
+**********************************************************************
+
+  Pinout:
+
+             0V   1   2  R/W
+             0V   3   4  1MHzE
+             0V   5   6  NNMI
+             0V   7   8  NIRQ
+             0V   9  10  NPGFC
+             0V  11  12  NPGFD
+             0V  13  14  RST
+             0V  15  16  Analog In
+             0V  17  18  D0
+             D1  19  20  D2
+             D3  21  22  D4
+             D5  23  24  D6
+             D7  25  26  0V
+             A0  27  28  A1
+             A2  29  30  A3
+             A4  31  32  A5
+             A6  33  34  A7
+
+  Signal Definitions:
+
+              0 volts - This is connected to the main system 0 volts line. The reason for putting
+                        0V lines between the active signal lines is to reduce the interference
+                        between different signals.
+          R/W (pin 2) - This is the read-not-write signal from the 6502 CPU, buffered by two
+                        74LS04 inverters.
+        1MHzE (pin 4) - This is the 1MHz system timing clock. It is a 50% duty-cycle square wave.
+                        The 6502 CPU is operating at 2MHz, so the main processor clock is stretched
+                        whenever 1MHz bus peripherals are being accessed. The trailing edges of the
+                        1MHz and 2MHz processor clock are then coincidental. The processor clock
+                        is only ever truly 2MHz when accessing main memory.
+         NNMI (pin 6) - Not Non-Maskable Interrupt. This is connected directly to the 6502 NMI input.
+                        It is pulled up to +5 volts with a 3K3 resistor. Both Disc and Econet systems
+                        rely heavily upon NMIs for their operation so take care. Note that NMIs are
+                        triggered on negative going edges of NMI signals.
+         NIRQ (pin 8) - Not Interrupt Request. This is connected directly to the 6502 IRQ input. Any
+                        devices connected to this input should have open collector outputs. The line
+                        is pulled up to +5 volts with a 3K3 resistor. Interrupts from the 1MHz bus
+                        must not occur until the software on the main system is able to cope with
+                        them. All interrupts must therefore be disabled after a reset. Note that the
+                        main system software may operate very slowly if considerable use is made of
+                        interrupts. Certain functions such as the real time clock which is
+                        incremented every 10 mS will be affected if interrupts are masked for more
+                        than this period.
+       NPGFC (pin 10) - Not page &FC. This signal is derived from the 6502 address bus. It goes low
+                        whenever page &FC is written to or read from. FRED is the name given to this
+                        page in memory.
+      NPGGFD (pin 12) - Not page &FD. This signal is derived from the 6502 address bus. It goes low
+                        whenever page &FD is accessed. JIM is the name given to this page in memory.
+        NRST (pin 14) - Not RESET. This is an active low output from the system reset line. It may
+                        be used to initialise peripherals whenever a power up or a BREAK causes a
+                        reset.
+   Analog In (pin 16) - This is an input to the audio amplifier on the main computer. The amplified
+                        signal is produced over the speaker on the keyboard. Its input impedance is
+                        9K Ohms and a 3 volt RMS signal will produce maximum volume on the speaker.
+                        Note however that signals as large as this will cause distortion if the sound
+                        or speech is used at the same time.
+   D0-D7 (pins 18-24) - This is a bi-directional 8 bit data bus which is connected via a 74LS245
+                        buffer (IC72) to the CPU. The direction of data transfer is determined by
+                        the R/W line signal. The buffer is enabled whenever FRED or JIM are accessed.
+   A0-A7 (pins 27-34) - These are connected directly to the lower 8 CPU address lines via a 74LS244
+                        buffer (IC71) which is always enabled.
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __BBC_1MHZBUS_SLOT__
+#define __BBC_1MHZBUS_SLOT__
+
+#include "emu.h"
+
+
+//**************************************************************************
+//  CONSTANTS
+//**************************************************************************
+
+#define BBC_1MHZBUS_SLOT_TAG      "1mhzbus"
+
+
+//**************************************************************************
+//  INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_BBC_1MHZBUS_SLOT_ADD(_tag, _slot_intf, _def_slot) \
+	MCFG_DEVICE_ADD(_tag, BBC_1MHZBUS_SLOT, 0) \
+	MCFG_DEVICE_SLOT_INTERFACE(_slot_intf, _def_slot, false)
+
+#define MCFG_BBC1MHZ_PASSTHRU_1MHZBUS_SLOT_ADD() \
+	MCFG_BBC_1MHZBUS_SLOT_ADD(BBC_1MHZBUS_SLOT_TAG, 0, bbc_1mhzbus_devices, nullptr)
+
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> bbc_1mhzbus_slot_device
+
+class device_bbc_1mhzbus_interface;
+
+class bbc_1mhzbus_slot_device : public device_t,
+												public device_slot_interface
+{
+public:
+	// construction/destruction
+	bbc_1mhzbus_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+	virtual ~bbc_1mhzbus_slot_device() {}
+
+
+protected:
+	// device-level overrides
+	virtual void device_start() override;
+	virtual void device_reset() override;
+
+	device_bbc_1mhzbus_interface *m_card;
+};
+
+
+// ======================> device_bbc_1mhzbus_interface
+
+class device_bbc_1mhzbus_interface : public device_slot_card_interface
+{
+public:
+	// construction/destruction
+	device_bbc_1mhzbus_interface(const machine_config &mconfig, device_t &device);
+	virtual ~device_bbc_1mhzbus_interface();
+
+protected:
+	bbc_1mhzbus_slot_device *m_slot;
+};
+
+
+// device type definition
+extern const device_type BBC_1MHZBUS_SLOT;
+
+SLOT_INTERFACE_EXTERN( bbc_1mhzbus_devices );
+
+
+#endif
--- a/src/devices/bus/bbc/analogue/analogue.cpp
+++ b/src/devices/bus/bbc/analogue/analogue.cpp
@ -0,0 +1,96 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+    BBC analogue port emulation
+
+**********************************************************************/
+
+#include "analogue.h"
+
+
+//**************************************************************************
+//  DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type BBC_ANALOGUE_SLOT = &device_creator<bbc_analogue_slot_device>;
+
+
+
+//**************************************************************************
+//  DEVICE BBC_ANALOGUE PORT INTERFACE
+//**************************************************************************
+
+//-------------------------------------------------
+//  device_bbc_analogue_interface - constructor
+//-------------------------------------------------
+
+device_bbc_analogue_interface::device_bbc_analogue_interface(const machine_config &mconfig, device_t &device)
+	: device_slot_card_interface(mconfig, device)
+{
+	m_slot = dynamic_cast<bbc_analogue_slot_device *>(device.owner());
+}
+
+
+//-------------------------------------------------
+//  ~device_bbc_analogue_interface - destructor
+//-------------------------------------------------
+
+device_bbc_analogue_interface::~device_bbc_analogue_interface()
+{
+}
+
+
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+//  bbc_analogue_slot_device - constructor
+//-------------------------------------------------
+
+bbc_analogue_slot_device::bbc_analogue_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+		device_t(mconfig, BBC_ANALOGUE_SLOT, "BBC Micro Analogue port", tag, owner, clock, "bbc_analogue_slot", __FILE__),
+		device_slot_interface(mconfig, *this)
+{
+}
+
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void bbc_analogue_slot_device::device_start()
+{
+	m_card = dynamic_cast<device_bbc_analogue_interface *>(get_card_device());
+}
+
+
+//-------------------------------------------------
+//  device_reset - device-specific reset
+//-------------------------------------------------
+
+void bbc_analogue_slot_device::device_reset()
+{
+	if (get_card_device())
+	{
+		get_card_device()->reset();
+	}
+}
+
+
+//-------------------------------------------------
+//  SLOT_INTERFACE( bbc_analogue_devices )
+//-------------------------------------------------
+
+
+// slot devices
+//#include "joystick.h"
+//#include "quinkey.h"
+
+
+SLOT_INTERFACE_START( bbc_analogue_devices )
+//	SLOT_INTERFACE("joystick",  BBC_JOYSTICKS)        /* Acorn ANH01 BBC Micro Joysticks */
+//	SLOT_INTERFACE("quinkey",   BBC_QUINKEY)          /* Microwriter Quinkey */
+SLOT_INTERFACE_END
--- a/src/devices/bus/bbc/analogue/analogue.h
+++ b/src/devices/bus/bbc/analogue/analogue.h
@ -0,0 +1,98 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+    BBC analogue port emulation
+
+**********************************************************************
+
+  Pinout:
+
+            +5V   1
+                      9  LPSTB
+             0V   2
+                     10  PB1
+             0V   3
+                     11  VREF
+            CH3   4
+                     12  CH2
+   Analogue GND   5
+                     13  PB0
+             0V   6
+                     14  VREF
+            CH1   7
+                     15  CH0
+   Analogue GND   8
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __BBC_ANALOGUE_SLOT__
+#define __BBC_ANALOGUE_SLOT__
+
+#include "emu.h"
+
+
+//**************************************************************************
+//  CONSTANTS
+//**************************************************************************
+
+#define BBC_ANALOGUE_SLOT_TAG      "analogue"
+
+
+//**************************************************************************
+//  INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_BBC_ANALOGUE_SLOT_ADD(_tag, _slot_intf, _def_slot) \
+	MCFG_DEVICE_ADD(_tag, BBC_ANALOGUE_SLOT, 0) \
+	MCFG_DEVICE_SLOT_INTERFACE(_slot_intf, _def_slot, false)
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> bbc_analogue_slot_device
+
+class device_bbc_analogue_interface;
+
+class bbc_analogue_slot_device : public device_t,
+												public device_slot_interface
+{
+public:
+	// construction/destruction
+	bbc_analogue_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+	virtual ~bbc_analogue_slot_device() {}
+
+
+protected:
+	// device-level overrides
+	virtual void device_start() override;
+	virtual void device_reset() override;
+
+	device_bbc_analogue_interface *m_card;
+};
+
+
+// ======================> device_bbc_analogue_interface
+
+class device_bbc_analogue_interface : public device_slot_card_interface
+{
+public:
+	// construction/destruction
+	device_bbc_analogue_interface(const machine_config &mconfig, device_t &device);
+	virtual ~device_bbc_analogue_interface();
+
+protected:
+	bbc_analogue_slot_device *m_slot;
+};
+
+
+// device type definition
+extern const device_type BBC_ANALOGUE_SLOT;
+
+SLOT_INTERFACE_EXTERN( bbc_analogue_devices );
+
+
+#endif
--- a/src/devices/bus/bbc/tube/tube.cpp
+++ b/src/devices/bus/bbc/tube/tube.cpp
@ -0,0 +1,125 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+    BBC Tube emulation
+
+**********************************************************************/
+
+#include "tube.h"
+
+
+
+//**************************************************************************
+//  DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type BBC_TUBE_SLOT = &device_creator<bbc_tube_slot_device>;
+
+
+
+//**************************************************************************
+//  DEVICE BBC_TUBE PORT INTERFACE
+//**************************************************************************
+
+//-------------------------------------------------
+//  device_bbc_tube_interface - constructor
+//-------------------------------------------------
+
+device_bbc_tube_interface::device_bbc_tube_interface(const machine_config &mconfig, device_t &device)
+	: device_slot_card_interface(mconfig, device)
+{
+	m_slot = dynamic_cast<bbc_tube_slot_device *>(device.owner());
+}
+
+
+//-------------------------------------------------
+//  ~device_bbc_tube_interface - destructor
+//-------------------------------------------------
+
+device_bbc_tube_interface::~device_bbc_tube_interface()
+{
+}
+
+
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+//  bbc_tube_slot_device - constructor
+//-------------------------------------------------
+
+bbc_tube_slot_device::bbc_tube_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+		device_t(mconfig, BBC_TUBE_SLOT, "BBC Micro Tube port", tag, owner, clock, "bbc_tube_slot", __FILE__),
+		device_slot_interface(mconfig, *this)
+{
+}
+
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void bbc_tube_slot_device::device_start()
+{
+	m_card = dynamic_cast<device_bbc_tube_interface *>(get_card_device());
+}
+
+
+//-------------------------------------------------
+//  device_reset - device-specific reset
+//-------------------------------------------------
+
+void bbc_tube_slot_device::device_reset()
+{
+	if (get_card_device())
+	{
+		get_card_device()->reset();
+	}
+}
+
+
+//-------------------------------------------------
+//  SLOT_INTERFACE( bbc_tube_ext_devices )
+//-------------------------------------------------
+
+
+// slot devices
+//#include "6502copro.h"
+//#include "z80copro.h"
+//#include "32016copro.h"
+//#include "cambcopro.h"
+//#include "armcopro.h"
+//#include "unicopro.h"
+
+
+SLOT_INTERFACE_START( bbc_tube_ext_devices )
+//	SLOT_INTERFACE("6502copro",  BBC_6502_COPRO)     /* Acorn ANC01 6502 2nd processor */
+//	SLOT_INTERFACE("z80copro",   BBC_Z80_COPRO)      /* Acorn ANC04 Z80 2nd processor */
+//	SLOT_INTERFACE("32016copro", BBC_32016_COPRO)    /* Acorn ANC05 32016 2nd processor */
+//	SLOT_INTERFACE("cambcopro",  BBC_CAMB_COPRO)     /* Acorn ANC06 Cambridge Co-Processor */
+//	SLOT_INTERFACE("armcopro",   BBC_ARM_COPRO)      /* Acorn ANC13 ARM Evaluation System */
+//	SLOT_INTERFACE("unicopro",   BBC_UNIVERSAL)      /* Acorn ANC21 Universal 2nd Processor Unit */
+//	SLOT_INTERFACE("a500copro",  BBC_A500_COPRO)     /* Acorn A500 2nd Processor */
+SLOT_INTERFACE_END
+
+
+//-------------------------------------------------
+//  SLOT_INTERFACE( bbc_tube_int_devices )
+//-------------------------------------------------
+
+
+// slot devices
+//#include "65c102copro.h"
+//#include "80186copro.h"
+//#include "arm7copro.h"
+
+
+SLOT_INTERFACE_START( bbc_tube_int_devices )
+//	SLOT_INTERFACE("65c102copro", BBC_65C102_COPRO)  /* Acorn ADC06 6502 co-processor */
+//	SLOT_INTERFACE("80186copro",  BBC_80186_COPRO)   /* Acorn ADC08 80186 co-processor */
+//	SLOT_INTERFACE("80286copro",  BBC_80286_COPRO)   /* Acorn ADC08 80286 co-processor */
+//	SLOT_INTERFACE("arm7copro",   BBC_ARM7_COPRO)    /* Sprow ARM7 co-processor */
+SLOT_INTERFACE_END
--- a/src/devices/bus/bbc/tube/tube.h
+++ b/src/devices/bus/bbc/tube/tube.h
@ -0,0 +1,110 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+    BBC Tube emulation
+
+**********************************************************************
+
+  Pinout:
+
+             0V   1   2  R/NW (read/not-write)
+             0V   3   4  2MHzE
+             0V   5   6  NIRQ (not-interrupt request)
+             0V   7   8  NTUBE
+             0V   9  10  NRST (not-reset)
+             0V  11  12  D0
+             0V  13  14  D1
+             0V  15  16  D2
+             0V  17  18  D3
+             0V  19  20  D4
+             0V  21  22  D5
+             0V  23  24  D6
+             0V  25  26  D7
+             0V  27  28  A0
+             0V  29  30  A1
+            +5V  31  32  A2
+            +5V  33  34  A3
+            +5V  35  36  A4
+            +5V  37  38  A5
+            +5V  39  40  A6
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __BBC_TUBE_SLOT__
+#define __BBC_TUBE_SLOT__
+
+#include "emu.h"
+
+
+//**************************************************************************
+//  CONSTANTS
+//**************************************************************************
+
+#define BBC_TUBE_SLOT_TAG      "tube"
+
+
+//**************************************************************************
+//  INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_BBC_TUBE_SLOT_ADD(_tag, _slot_intf, _def_slot) \
+	MCFG_DEVICE_ADD(_tag, BBC_TUBE_SLOT, 0) \
+	MCFG_DEVICE_SLOT_INTERFACE(_slot_intf, _def_slot, false)
+
+#define MCFG_BBC_PASSTHRU_TUBE_SLOT_ADD() \
+	MCFG_BBC_TUBE_SLOT_ADD(BBC_TUBE_SLOT_TAG, 0, bbc_tube_devices, nullptr)
+
+
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> bbc_tube_slot_device
+
+class device_bbc_tube_interface;
+
+class bbc_tube_slot_device : public device_t,
+												public device_slot_interface
+{
+public:
+	// construction/destruction
+	bbc_tube_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+	virtual ~bbc_tube_slot_device() {}
+
+
+protected:
+	// device-level overrides
+	virtual void device_start() override;
+	virtual void device_reset() override;
+
+
+	device_bbc_tube_interface *m_card;
+};
+
+
+// ======================> device_bbc_tube_interface
+
+class device_bbc_tube_interface : public device_slot_card_interface
+{
+public:
+	// construction/destruction
+	device_bbc_tube_interface(const machine_config &mconfig, device_t &device);
+	virtual ~device_bbc_tube_interface();
+
+protected:
+	bbc_tube_slot_device *m_slot;
+};
+
+
+// device type definition
+extern const device_type BBC_TUBE_SLOT;
+
+SLOT_INTERFACE_EXTERN( bbc_tube_ext_devices );
+SLOT_INTERFACE_EXTERN( bbc_tube_int_devices );
+
+
+#endif
--- a/src/devices/bus/bbc/userport/userport.cpp
+++ b/src/devices/bus/bbc/userport/userport.cpp
@ -0,0 +1,102 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+    BBC User Port emulation
+
+**********************************************************************/
+
+#include "userport.h"
+
+
+//**************************************************************************
+//  GLOBAL VARIABLES
+//**************************************************************************
+
+const device_type BBC_USERPORT_SLOT = &device_creator<bbc_userport_device>;
+
+
+
+//**************************************************************************
+//  DEVICE BBC_USERPORT INTERFACE
+//**************************************************************************
+
+//-------------------------------------------------
+//  device_bbc_userport_interface - constructor
+//-------------------------------------------------
+
+device_bbc_userport_interface::device_bbc_userport_interface(const machine_config &mconfig, device_t &device)
+	: device_slot_card_interface(mconfig, device)
+{
+	m_slot = dynamic_cast<bbc_userport_device *>(device.owner());
+}
+
+
+//-------------------------------------------------
+//  ~device_bbc_userport_interface - destructor
+//-------------------------------------------------
+
+device_bbc_userport_interface::~device_bbc_userport_interface()
+{
+}
+
+
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+//  bbc_userport_slot_device - constructor
+//-------------------------------------------------
+
+bbc_userport_device::bbc_userport_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+		device_t(mconfig, BBC_USERPORT_SLOT, "BBC Micro User port", tag, owner, clock, "bbc_userport_slot", __FILE__),
+		device_slot_interface(mconfig, *this), m_device(nullptr)
+{
+}
+
+
+//-------------------------------------------------
+//  ~bbc_userport_slot_device - destructor
+//-------------------------------------------------
+
+//bbc_userport_device::~bbc_userport_device()
+//{
+//}
+
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void bbc_userport_device::device_start()
+{
+	m_device = dynamic_cast<device_bbc_userport_interface *>(get_card_device());
+}
+
+
+UINT8 bbc_userport_device::read_portb()
+{
+	UINT8 data = 0xff;
+	if (m_device)
+		data |= m_device->read_portb();
+	return data;
+}
+
+
+//-------------------------------------------------
+//  SLOT_INTERFACE( bbc_userport_devices )
+//-------------------------------------------------
+
+
+// slot devices
+//#include "amxmouse.h"
+//#include "tracker.h"
+
+
+SLOT_INTERFACE_START( bbc_userport_devices )
+//	SLOT_INTERFACE("amxmouse",  BBC_AMXMOUSE)       /* AMX Mouse */
+//	SLOT_INTERFACE("tracker",   BBC_TRACKER)         /* Acorn Tracker Ball */
+//	SLOT_INTERFACE("music4000", BBC_MUSIC4000)       /* Hybrid Music 4000 Keyboard */
+SLOT_INTERFACE_END
--- a/src/devices/bus/bbc/userport/userport.h
+++ b/src/devices/bus/bbc/userport/userport.h
@ -0,0 +1,104 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+    BBC User Port emulation
+
+**********************************************************************
+
+  Pinout:
+
+            +5V   1   2  CB1
+            +5V   3   4  CB2
+             0V   5   6  PB0
+             0V   7   8  PB1
+             0V   9  10  PB2
+             0V  11  12  PB3
+             0V  13  14  PB4
+             0V  15  16  PB5
+             0V  17  18  PB6
+             0V  19  20  PB7
+
+  Signal Definitions:
+
+  Connected directly to the 6522 User VIA.
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __BBC_USERPORT_SLOT__
+#define __BBC_USERPORT_SLOT__
+
+#include "emu.h"
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+class bbc_userport_device;
+
+// ======================> device_bbc_userport_interface
+
+class device_bbc_userport_interface : public device_slot_card_interface
+{
+public:
+	// construction/destruction
+	device_bbc_userport_interface(const machine_config &mconfig, device_t &device);
+	virtual ~device_bbc_userport_interface();
+
+	virtual UINT8 read_portb() { return 0xff; };
+	virtual UINT8 read_cb1() { return 0xff; };
+	virtual UINT8 read_cb2() { return 0xff; };
+
+protected:
+	bbc_userport_device *m_slot;
+};
+
+// ======================> bbc_userport_device
+
+class bbc_userport_device : public device_t,
+	public device_slot_interface
+{
+public:
+	// construction/destruction
+	bbc_userport_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+	virtual ~bbc_userport_device() {}
+
+	UINT8 read_portb();
+	UINT8 read_cb1();
+	UINT8 read_cb2();
+
+	// device-level overrides
+	virtual void device_start() override;
+
+protected:
+	device_bbc_userport_interface *m_device;
+};
+
+// device type definition
+extern const device_type BBC_USERPORT_SLOT;
+
+
+//**************************************************************************
+//  INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_BBC_USERPORT_SLOT_ADD(_tag, _slot_intf, _def_slot) \
+	MCFG_DEVICE_ADD(_tag, BBC_USERPORT_SLOT, 0) \
+	MCFG_DEVICE_SLOT_INTERFACE(_slot_intf, _def_slot, false)
+
+#define MCFG_BBC_USERPORT_PB_HANDLER(_devcb) \
+	devcb = &bbc_userport_device::set_pb_handler(*device, DEVCB_##_devcb);
+
+#define MCFG_BBC_USERPORT_CB1_HANDLER(_devcb) \
+	devcb = &bbc_userport_device::set_cb1_handler(*device, DEVCB_##_devcb);
+
+#define MCFG_BBC_USERPORT_CB2_HANDLER(_devcb) \
+	devcb = &bbc_userport_device::set_cb2_handler(*device, DEVCB_##_devcb);
+
+
+SLOT_INTERFACE_EXTERN( bbc_userport_devices );
+
+
+#endif
--- a/src/mame/drivers/bbc.cpp
+++ b/src/mame/drivers/bbc.cpp
@ -899,10 +899,10 @@ static MACHINE_CONFIG_DERIVED( bbcb, bbca )

 	/* user via */
 	MCFG_DEVICE_ADD("via6522_1", VIA6522, XTAL_16MHz / 16)
-		MCFG_VIA6522_READPB_HANDLER(READ8(bbc_state, bbcb_via_user_read_portb))
-		MCFG_VIA6522_WRITEPA_HANDLER(DEVWRITE8("cent_data_out", output_latch_device, write))
-		MCFG_VIA6522_WRITEPB_HANDLER(WRITE8(bbc_state, bbcb_via_user_write_portb))
-		MCFG_VIA6522_CA2_HANDLER(DEVWRITELINE("centronics", centronics_device, write_strobe))
+	MCFG_VIA6522_READPB_HANDLER(READ8(bbc_state, bbcb_via_user_read_portb))
+	MCFG_VIA6522_WRITEPA_HANDLER(DEVWRITE8("cent_data_out", output_latch_device, write))
+	MCFG_VIA6522_WRITEPB_HANDLER(WRITE8(bbc_state, bbcb_via_user_write_portb))
+	MCFG_VIA6522_CA2_HANDLER(DEVWRITELINE("centronics", centronics_device, write_strobe))
 	MCFG_VIA6522_IRQ_HANDLER(INPUTLINE("maincpu", M6502_IRQ_LINE))

 	/* adc */
@ -934,6 +934,12 @@ static MACHINE_CONFIG_DERIVED( bbcb, bbca )
 	MCFG_ECONET_DATA_CALLBACK(DEVWRITELINE("mc6854", mc6854_device, set_rx))
 	MCFG_ECONET_SLOT_ADD("econet254", 254, econet_devices, nullptr)

+	/* expansion ports */
+	MCFG_BBC_ANALOGUE_SLOT_ADD("analogue", bbc_analogue_devices, nullptr)
+	MCFG_BBC_1MHZBUS_SLOT_ADD("1mhzbus", bbc_1mhzbus_devices, nullptr)
+	MCFG_BBC_TUBE_SLOT_ADD("tube", bbc_tube_ext_devices, nullptr)
+	MCFG_BBC_USERPORT_SLOT_ADD("userport", bbc_userport_devices, nullptr)
+
 	/* software lists */
 	MCFG_SOFTWARE_LIST_ADD("cass_ls_b",      "bbcb_cass")
 	MCFG_SOFTWARE_LIST_ADD("flop_ls_b",      "bbcb_flop")
@ -1067,9 +1073,23 @@ static MACHINE_CONFIG_DERIVED( abc110, bbcbp )
 	MCFG_DEVICE_REMOVE("wd1770:1")

 	/* Add Z80 co-processor */
+	//MCFG_DEVICE_MODIFY("tube")
+	//MCFG_SLOT_DEFAULT_OPTION("z80copro")
+	//MCFG_SLOT_FIXED(true)

 	/* Add ADAPTEC ACB-4000 Winchester Disc Controller */
+	//MCFG_DEVICE_ADD(SCSIBUS_TAG, SCSI_PORT, 0)
+	//MCFG_SCSI_DATA_INPUT_BUFFER("scsi_data_in")
+	//MCFG_SCSI_MSG_HANDLER(DEVWRITELINE("scsi_ctrl_in", input_buffer_device, write_bit0))
+	//MCFG_SCSI_BSY_HANDLER(WRITELINE(bbc_state, scsi_bsy_w))
+	//MCFG_SCSI_REQ_HANDLER(WRITELINE(bbc_state, scsi_req_w))
+	//MCFG_SCSI_IO_HANDLER(DEVWRITELINE("scsi_ctrl_in", input_buffer_device, write_bit6))
+	//MCFG_SCSI_CD_HANDLER(DEVWRITELINE("scsi_ctrl_in", input_buffer_device, write_bit7))
+	//MCFG_SCSIDEV_ADD(SCSIBUS_TAG ":" SCSI_PORT_DEVICE1, "harddisk", ACB4070, SCSI_ID_0)

+	//MCFG_SCSI_OUTPUT_LATCH_ADD("scsi_data_out", SCSIBUS_TAG)
+	//MCFG_DEVICE_ADD("scsi_data_in", INPUT_BUFFER, 0)
+	//MCFG_DEVICE_ADD("scsi_ctrl_in", INPUT_BUFFER, 0)
 	/* Add 10MB ST-412 Winchester */

 	/* software lists */
@ -1308,6 +1328,13 @@ static MACHINE_CONFIG_START( bbcm, bbc_state )
 	MCFG_ECONET_CLK_CALLBACK(WRITELINE(bbc_state, econet_clk_w))
 	MCFG_ECONET_DATA_CALLBACK(DEVWRITELINE("mc6854", mc6854_device, set_rx))
 	MCFG_ECONET_SLOT_ADD("econet254", 254, econet_devices, nullptr)
+
+	/* expansion ports */
+	MCFG_BBC_ANALOGUE_SLOT_ADD("analogue", bbc_analogue_devices, nullptr)
+	MCFG_BBC_1MHZBUS_SLOT_ADD("1mhzbus", bbc_1mhzbus_devices, nullptr)
+	MCFG_BBC_TUBE_SLOT_ADD("tube_ext", bbc_tube_ext_devices, nullptr)
+	MCFG_BBC_TUBE_SLOT_ADD("tube_int", bbc_tube_int_devices, nullptr)
+	MCFG_BBC_USERPORT_SLOT_ADD("userport", bbc_userport_devices, nullptr)
 MACHINE_CONFIG_END


--- a/src/mame/includes/bbc.h
+++ b/src/mame/includes/bbc.h
@ -29,6 +29,11 @@
 #include "sound/tms5220.h"
 #include "imagedev/cassette.h"

+#include "bus/bbc/analogue/analogue.h"
+#include "bus/bbc/1mhzbus/1mhzbus.h"
+#include "bus/bbc/tube/tube.h"
+#include "bus/bbc/userport/userport.h"
+
 #include "bus/generic/slot.h"
 #include "bus/generic/carts.h"