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// 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
**********************************************************************/
#ifndef MAME_BUS_BBC_ANALOGUE_ANALOGUE_H
#define MAME_BUS_BBC_ANALOGUE_ANALOGUE_H
#pragma once
//**************************************************************************
// 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_t clock);
uint8_t ch_r(int channel);
uint8_t pb_r();
protected:
// device-level overrides
virtual void device_validity_check(validity_checker &valid) const override;
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
virtual ~device_bbc_analogue_interface();
virtual uint8_t ch_r(int channel) { return 0x00; };
virtual uint8_t pb_r() { return 0x30; };
protected:
device_bbc_analogue_interface(const machine_config &mconfig, device_t &device);
bbc_analogue_slot_device *m_slot;
};
// device type definition
DECLARE_DEVICE_TYPE(BBC_ANALOGUE_SLOT, bbc_analogue_slot_device)
SLOT_INTERFACE_EXTERN( bbc_analogue_devices );
#endif // MAME_BUS_BBC_ANALOGUE_ANALOGUE_H
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