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/**********************************************************************
SMC KR2376 Keyboard Encoder emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************
_____ _____
Vcc 1 |* \_/ | 40 Frequency Control A
Frequency Control B 2 | | 39 X0
Frequency Control C 3 | | 38 X1
Shift Input 4 | | 37 X2
Control Input 5 | | 36 X3
Parity Invert Input 6 | | 35 X4
Parity Output 7 | | 34 X5
Data Output B8 8 | | 33 X6
Data Output B7 9 | | 32 X7
Data Output B6 10 | KR2376 | 31 Y0
Data Output B5 11 | | 30 Y1
Data Output B4 12 | | 29 Y2
Data Output B3 13 | | 28 Y3
Data Output B2 14 | | 27 Y4
Data Output B1 15 | | 26 Y5
Strobe Output 16 | | 25 Y6
Ground 17 | | 24 Y7
Vgg 18 | | 23 Y8
Strobe Control Input 19 | | 22 Y9
Invert Input 20 |_____________| 21 Y10
**********************************************************************/
#ifndef __KR2376__
#define __KR2376__
#define MCFG_KR2376_STROBE_CALLBACK(_write) \
devcb = &kr2376_device::set_strobe_wr_callback(*device, DEVCB_##_write);
/*
* Input pins
*/
enum kr2376_input_pin_t
{
KR2376_DSII=20, /* DSII - Pin 20 - Data & Strobe Invert Input */
KR2376_PII=6 /* PII - Pin 6 - Parity Invert Input */
};
enum kr2376_output_pin_t
{
KR2376_SO=16, /* SO - Pin 16 - Strobe Output */
KR2376_PO=7 /* PO - Pin 7 - Parity Output */
};
class kr2376_device : public device_t
{
public:
kr2376_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
~kr2376_device() {}
template<class _Object> static devcb_base &set_strobe_wr_callback(device_t &device, _Object object) { return downcast<kr2376_device &>(device).m_write_strobe.set_callback(object); }
/* keyboard data */
DECLARE_READ8_MEMBER( data_r );
/* Set an input pin */
void set_input_pin( kr2376_input_pin_t pin, int data );
/* Get an output pin */
int get_output_pin( kr2376_output_pin_t pin );
protected:
// device-level overrides
virtual void device_start();
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
virtual ioport_constructor device_input_ports() const;
private:
// internal state
int m_pins[41];
int m_ring11; /* sense input scan counter */
int m_ring8; /* drive output scan counter */
int m_modifiers; /* modifier inputs */
int m_strobe; /* strobe output */
int m_strobe_old;
int m_parity;
int m_data;
/* timers */
emu_timer *m_scan_timer; /* keyboard scan timer */
devcb_write_line m_write_strobe;
enum
{
TIMER_SCAN_TICK
};
void change_output_lines();
void clock_scan_counters();
void detect_keypress();
};
extern const device_type KR2376;
#endif
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