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/***************************************************************************
Midway 8080-based black and white hardware
****************************************************************************/
#include "emu.h"
#include "machine/mb14241.h"
typedef struct _mb14241_state mb14241_state;
struct _mb14241_state
{
UINT16 shift_data; /* 15 bits only */
UINT8 shift_count; /* 3 bits */
};
/*****************************************************************************
INLINE FUNCTIONS
*****************************************************************************/
INLINE mb14241_state *get_safe_token( device_t *device )
{
assert(device != NULL);
assert(device->type() == MB14241);
return (mb14241_state *)downcast<legacy_device_base *>(device)->token();
}
/*****************************************************************************
IMPLEMENTATION
*****************************************************************************/
WRITE8_DEVICE_HANDLER( mb14241_shift_count_w )
{
mb14241_state *mb14241 = get_safe_token(device);
mb14241->shift_count = ~data & 0x07;
}
WRITE8_DEVICE_HANDLER( mb14241_shift_data_w )
{
mb14241_state *mb14241 = get_safe_token(device);
mb14241->shift_data = (mb14241->shift_data >> 8) | ((UINT16)data << 7);
}
READ8_DEVICE_HANDLER( mb14241_shift_result_r )
{
mb14241_state *mb14241 = get_safe_token(device);
return mb14241->shift_data >> mb14241->shift_count;
}
/*****************************************************************************
DEVICE INTERFACE
*****************************************************************************/
static DEVICE_START( mb14241 )
{
mb14241_state *mb14241 = get_safe_token(device);
device->save_item(NAME(mb14241->shift_data));
device->save_item(NAME(mb14241->shift_count));
}
static DEVICE_RESET( mb14241 )
{
mb14241_state *mb14241 = get_safe_token(device);
mb14241->shift_data = 0;
mb14241->shift_count = 0;
}
static const char DEVTEMPLATE_SOURCE[] = __FILE__;
#define DEVTEMPLATE_ID( p, s ) p##mb14241##s
#define DEVTEMPLATE_FEATURES DT_HAS_START | DT_HAS_RESET
#define DEVTEMPLATE_NAME "MB14241"
#define DEVTEMPLATE_FAMILY "MB14241 Shifter IC"
#include "devtempl.h"
DEFINE_LEGACY_DEVICE(MB14241, mb14241);
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