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// license:BSD-3-Clause
// copyright-holders:Juergen Buchmueller
/**********************************************************************
Rockwell 10788 General Purpose Keyboard and Display circuit
Juergen Buchmueller <pullmoll@t-online.de>
The device decodes reads/write to a 16 byte I/O range defined
by three wired inputs SC5, SC6 and SC7. The range is one of
80-8f, 90-9f, ..., f0-ff depending on the wiring.
**********************************************************************/
#ifndef MAME_MACHINE_R10788_H
#define MAME_MACHINE_R10788_H
#pragma once
class r10788_device : public device_t
{
public:
r10788_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
enum {
KTR = 0xc, //!< Transfer Keyboard Return
KTS = 0xa, //!< Transfer Keyboard Strobe
KLA = 0xe, //!< Load Display Register A
KLB = 0xd, //!< Load Display Register B
KDN = 0x3, //!< Turn On Display
KAF = 0xb, //!< Turn Off A
KBF = 0x7, //!< Turn Off B
KER = 0x6 //!< Reset Keyboard Error
};
uint8_t io_r(offs_t offset);
void io_w(offs_t offset, uint8_t data);
auto update_cb() { return m_display.bind(); } /* Set the writer used to update a display digit */
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
TIMER_CALLBACK_MEMBER(display_update);
private:
uint8_t m_reg[2][16]; //!< display registers
uint8_t m_ktr; //!< transfer keyboard return value
uint8_t m_kts; //!< transfer keyboard strobe value
uint8_t m_kla; //!< display register A value
uint8_t m_klb; //!< display register B value
uint8_t m_mask_a; //!< display enable bits for A
uint8_t m_mask_b; //!< display enable bits for B
uint8_t m_ker; //!< keyboard error value
int m_io_counter; //!< current I/O register index
int m_scan_counter; //!< current display scan
devcb_write8 m_display; //!< display updater
emu_timer* m_timer; //!< timer running at clock / 18 / 36
};
DECLARE_DEVICE_TYPE(R10788, r10788_device)
#endif // MAME_MACHINE_R10788_H
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