summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/machine/r10788.h
blob: 51eb25777106ec38f3d59b611912082d46ee92ec (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
/**********************************************************************

    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 __R10788_H__
#define __R10788_H__

#include "device.h"

/*************************************
 *
 *  Device configuration macros
 *
 *************************************/

/* Set the writer used to update a display digit */
#define MCFG_R10788_UPDATE(_devcb) \
    r10788_device::set_update(*device, DEVCB_##_devcb);

class r10788_device : public device_t
{
public:
    r10788_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
    ~r10788_device() {}

    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
    };

    DECLARE_READ8_MEMBER ( io_r );
    DECLARE_WRITE8_MEMBER( io_w );

    template<class _Object> static devcb_base &set_update(device_t &device, _Object object) { return downcast<r10788_device &>(device).m_display.set_callback(object); }
protected:
    // device-level overrides
    virtual void device_start();
    virtual void device_reset();
    virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);

private:
    static const device_timer_id TIMER_DISPLAY = 0;

    UINT8        m_reg[2][16];          //!< display registers
    UINT8        m_ktr;                 //!< transfer keyboard return value
    UINT8        m_kts;                 //!< transfer keyboard strobe value
    UINT8        m_kla;                 //!< display register A value
    UINT8        m_klb;                 //!< display register B value
    UINT8        m_mask_a;              //!< display enable bits for A
    UINT8        m_mask_b;              //!< display enable bits for B
    UINT8        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
};

extern const device_type R10788;

#endif /* __R10788_H__ */