// license:BSD-3-Clause
// copyright-holders:Roberto Lavarone
/**********************************************************************
SMC KR2376 Keyboard Encoder emulation
**********************************************************************/
#include "emu.h"
#include "kr2376.h"
DEFINE_DEVICE_TYPE(KR2376_ST, kr2376_st_device, "kr2376_st", "SMC KR2376-ST Keyboard Encoder")
DEFINE_DEVICE_TYPE(KR2376_12, kr2376_12_device, "kr2376_12", "SMC KR2376-12 Keyboard Encoder")
kr2376_device::kr2376_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, type, tag, owner, clock),
m_read_x(*this, 0x7ff),
m_read_shift(*this, 0),
m_read_control(*this, 0),
m_write_strobe(*this)
{
}
kr2376_st_device::kr2376_st_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: kr2376_device(mconfig, KR2376_ST, tag, owner, clock)
{
}
uint8_t kr2376_st_device::key_codes(int mode, int x, int y)
{
static const uint8_t KEY_CODES[3][8][11] =
{
// normal
{
// Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
// NUL SOH STX ETX EOT ENQ ACK BEL DC1 P O X0
{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x11, 0x50, 0x30 }, // X0
// DLE K L N M NAK SYN ETB CAN EM SUB X1
{ 0x10, 0x4b, 0x4c, 0x4e, 0x4d, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a }, // X1
// - FS GS RS US < > , SP . _ X2
{ 0x2d, 0x1c, 0x1d, 0x1e, 0x1f, 0x3c, 0x3e, 0x2c, 0x20, 0x2e, 0x5f }, // X2
// 0 : p _ @ BS [ ] CR LF DEL X3
{ 0x30, 0x3a, 0x70, 0x5f, 0x40, 0x08, 0x5B, 0x5d, 0x0d, 0x0a, 0x7f }, // X3
{ 0x3b, 0x2f, 0x2e, 0x2c, 0x6d, 0x6e, 0x62, 0x76, 0x63, 0x78, 0x7a }, // X4
{ 0x6c, 0x6b, 0x6a, 0x68, 0x67, 0x66, 0x64, 0x73, 0x61, 0x0c, 0x1b }, // X5
{ 0x6f, 0x69, 0x75, 0x79, 0x74, 0x72, 0x65, 0x77, 0x71, 0x09, 0x0b }, // X6
{ 0x39, 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31, 0x5e, 0x5c } // X7
},
// shift
{
// Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
// NUL SOH STX ETX EOT ENQ ACK BEL DC1 @ _ X0
{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x11, 0x40, 0x5f }, // X0
// DLE [ \ ^ ] NAK SYN ETB CAN EM SUB X1
{ 0x10, 0x5b, 0x5c, 0x5e, 0x5d, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a }, // X1
// = FS GS RS US < > , SP . _ X2
{ 0x3d, 0x1c, 0x1d, 0x1e, 0x1f, 0x3c, 0x3e, 0x2c, 0x20, 0x2e, 0x5f }, // X2
// NUL * P DEL ` BS { } CR LF DEL X3
{ 0x00, 0x2a, 0x50, 0x7f, 0x60, 0x08, 0x7b, 0x7d, 0x0d, 0x0a, 0x7f }, // X3
{ 0x2b, 0x3f, 0x3e, 0x3c, 0x4d, 0x4e, 0x42, 0x56, 0x43, 0x58, 0x5a }, // X4
{ 0x4c, 0x4b, 0x4a, 0x48, 0x47, 0x46, 0x44, 0x53, 0x41, 0x0c, 0x1b }, // X5
{ 0x4f, 0x49, 0x55, 0x59, 0x54, 0x52, 0x45, 0x57, 0x51, 0x09, 0x0b }, // X6
{ 0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21, 0x7e, 0x7c } // X7
},
// control
{
// Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
// NUL SOH STX ETX EOT ENQ ACK BEL DC1 DLE SI X0
{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x11, 0x10, 0x0f }, // X0
// DLE VT FF SO CR NAK SYN ETB CAN EM SUB X1
{ 0x10, 0x0b, 0x0c, 0x0e, 0x0d, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a }, // X1
// NUL FS GS RS US NUL NUL NUL SP NUL US X2
{ 0x00, 0x1c, 0x1d, 0x1e, 0x1f, 0x00, 0x00, 0x00, 0x20, 0x00, 0x1f }, // X2
// NUL NUL DLE US NUL BS ESC GS CR LF DEL X3
{ 0x00, 0x00, 0x10, 0x1f, 0x00, 0x08, 0x1B, 0x1d, 0x0d, 0x0a, 0x7f }, // X3
{ 0x00, 0x00, 0x00, 0x00, 0x1d, 0x0e, 0x02, 0x16, 0x03, 0x18, 0x1a }, // X4
{ 0x0c, 0x0b, 0x0a, 0x08, 0x07, 0x06, 0x04, 0x13, 0x01, 0x0c, 0x1b }, // X5
{ 0x1f, 0x09, 0x15, 0x19, 0x14, 0x12, 0x05, 0x17, 0x11, 0x09, 0x0b }, // X6
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x1c } // X7
}
};
return KEY_CODES[mode][x][y];
}
kr2376_12_device::kr2376_12_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: kr2376_device(mconfig, KR2376_12, tag, owner, clock)
{
}
uint8_t kr2376_12_device::key_codes(int mode, int x, int y)
{
static const uint8_t KEY_CODES[3][8][11] =
{
// normal
{
// Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
// 3 2 1 RS SUB GS SYN STX NAK DC4 NUL
{ 0x33, 0x32, 0x31, 0x1e, 0x1a, 0x1d, 0x16, 0x02, 0x15, 0x14, 0x00 }, // X0
// 6 5 4 ] [ ETX CAN GS DEL DLE SOH
{ 0x36, 0x35, 0x34, 0x5d, 0x5b, 0x03, 0x18, 0x1d, 0x7f, 0x10, 0x01 }, // X1
// 9 8 7 | ~ FS EM ESC SUB HT ACK
{ 0x39, 0x38, 0x37, 0x7c, 0x7e, 0x1c, 0x19, 0x1b, 0x1a, 0x09, 0x06 }, // X2
// US VT DC1 BS SI HT LF FF CR SP ETB
{ 0x1f, 0x0b, 0x11, 0x08, 0x0f, 0x09, 0x0a, 0x0c, 0x0d, 0x20, 0x17 }, // X3
// - 0 9 8 7 6 5 4 3 2 1
{ 0x2d, 0x30, 0x39, 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31 }, // X4
// \ p o i u y t r e w q
{ 0x5c, 0x70, 0x6f, 0x69, 0x75, 0x79, 0x74, 0x72, 0x65, 0x77, 0x71 }, // X5
// : ; l k j h g f d s a
{ 0x3a, 0x3b, 0x6c, 0x6b, 0x6a, 0x68, 0x67, 0x66, 0x64, 0x73, 0x61 }, // X6
// _ / . , m n b v c x z
{ 0x5f, 0x2f, 0x2e, 0x2c, 0x6d, 0x6e, 0x62, 0x76, 0x63, 0x78, 0x7a } // X7
},
// shift
{
// Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
// 3 2 1 RS SUB DC2 SYN STX NAK DC4 NUL
{ 0x33, 0x32, 0x31, 0x1e, 0x1a, 0x12, 0x16, 0x02, 0x15, 0x14, 0x00 }, // X0
// 6 5 4 } { ETX CAN GS DEL DLE SOH
{ 0x36, 0x35, 0x34, 0x7d, 0x7b, 0x03, 0x18, 0x1d, 0x7f, 0x10, 0x01 }, // X1
// 9 8 7 \ ^ FS EM ESC SUB HT ACK
{ 0x39, 0x38, 0x37, 0x5c, 0x5e, 0x1c, 0x19, 0x1b, 0x1a, 0x09, 0x06 }, // X2
// US VT DC1 BS SO DC3 LF FF CR SP ETB
{ 0x1f, 0x0b, 0x11, 0x08, 0x0e, 0x13, 0x0a, 0x0c, 0x0d, 0x20, 0x17 }, // X3
// = 0 ) ( ' & % $ # " !
{ 0x3d, 0x30, 0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21 }, // X4
// @ P O I U Y T R E W Q
{ 0x40, 0x50, 0x4f, 0x49, 0x55, 0x59, 0x54, 0x52, 0x45, 0x57, 0x51 }, // X5
// * + L K J H G F D S A
{ 0x2a, 0x2b, 0x4c, 0x4b, 0x4a, 0x48, 0x47, 0x46, 0x44, 0x53, 0x41 }, // X6
// _ ? > < M N B V C X Z
{ 0x5f, 0x3f, 0x3e, 0x3c, 0x4d, 0x4e, 0x42, 0x56, 0x43, 0x58, 0x5a } // X7
},
// control
{
// Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
// 3 2 1 RS SUB GS SYN STX NAK DC4 NUL
{ 0x33, 0x32, 0x31, 0x1e, 0x1a, 0x1d, 0x16, 0x02, 0x15, 0x14, 0x00 }, // X0
// 6 5 4 GS ESC ETX CAN GS DEL DLE SOH
{ 0x36, 0x35, 0x34, 0x1d, 0x1b, 0x03, 0x18, 0x1d, 0x7f, 0x10, 0x01 }, // X1
// 9 8 7 FS RS FS EM ESC SUB HT ACK
{ 0x39, 0x38, 0x37, 0x1c, 0x1e, 0x1c, 0x19, 0x1b, 0x1a, 0x09, 0x06 }, // X2
// US VT DC1 BS SI HT LF FF CR SP ETB
{ 0x1f, 0x0b, 0x11, 0x08, 0x0f, 0x09, 0x0a, 0x0c, 0x0d, 0x20, 0x17 }, // X3
// - 0 9 8 7 6 5 4 3 2 1
{ 0x2d, 0x30, 0x39, 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31 }, // X4
// NUL DLE SI HT NAK EM DC4 DC2 ENQ ETB DC1
{ 0x00, 0x10, 0x0f, 0x09, 0x15, 0x19, 0x14, 0x12, 0x05, 0x17, 0x11 }, // X5
// : ; FF VT LF BS BEL ACK EOT DC3 SOH
{ 0x3a, 0x3b, 0x0c, 0x0b, 0x0a, 0x08, 0x07, 0x06, 0x04, 0x13, 0x01 }, // X6
// US / . , CR SO STX SYN ETX CAN SUB
{ 0x1f, 0x2f, 0x2e, 0x2c, 0x0d, 0x0e, 0x02, 0x16, 0x03, 0x18, 0x1a } // X7
}
};
return KEY_CODES[mode][x][y];
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void kr2376_device::device_start()
{
/* set initial values */
m_ring11 = 0;
m_ring8 = 0;
m_strobe = 0;
m_strobe_old = 0;
m_parity = 0;
m_data = 0;
memset(m_pins, 0x00, sizeof(m_pins));
change_output_lines();
/* create the timers */
m_scan_timer = timer_alloc(FUNC(kr2376_device::perform_scan), this);
m_scan_timer->adjust(attotime::zero, 0, attotime::from_hz(clock()));
/* register for state saving */
save_item(NAME(m_pins));
save_item(NAME(m_ring11));
save_item(NAME(m_ring8));
save_item(NAME(m_strobe));
save_item(NAME(m_strobe_old));
save_item(NAME(m_parity));
save_item(NAME(m_data));
}
/*-------------------------------------------------
set_input_pin - set an input pin
-------------------------------------------------*/
void kr2376_device::set_input_pin( input_pin_t pin, int data )
{
data = data ? 1 : 0;
switch ( pin )
{
case KR2376_PII:
case KR2376_DSII:
m_pins[pin] = data;
break;
}
}
/*-------------------------------------------------
get_output_pin - get the status of an output pin
-------------------------------------------------*/
int kr2376_device::get_output_pin( output_pin_t pin )
{
return m_pins[pin];
}
void kr2376_device::change_output_lines()
{
if (m_strobe != m_strobe_old)
{
m_strobe_old = m_strobe;
if (m_strobe) // strobe 0 --> 1 transition
{
/* update parity */
m_pins[KR2376_PO] = m_parity ^ m_pins[KR2376_PII];
}
m_pins[KR2376_SO] = m_strobe ^ m_pins[KR2376_DSII];
m_write_strobe(m_strobe ^ m_pins[KR2376_DSII]);
}
}
void kr2376_device::clock_scan_counters()
{
/* ring counters inhibited while strobe active */
if (!m_strobe)
{
m_ring11++;
if (m_ring11 == 11)
{
m_ring11 = 0;
m_ring8++;
if (m_ring8 == 8)
m_ring8 = 0;
}
}
}
void kr2376_device::detect_keypress()
{
if (m_read_x[m_ring8]() == (1 << m_ring11))
{
m_strobe = 1;
/* strobe 0->1 transition, encode char and update parity */
if (!m_strobe_old)
{
int i;
int parbit;
int shift = m_read_shift();
int control = m_read_control();
int table = 0;
if (shift)
table = 1;
else if (control)
table = 2;
m_data = key_codes(table, m_ring8, m_ring11);
/* Compute ODD parity */
m_parity = m_data;
parbit = 0;
for (i=0; i<8; i++)
parbit ^= (m_parity >> i) & 1;
m_parity = parbit;
}
}
else
{
m_strobe = 0;
}
}
TIMER_CALLBACK_MEMBER(kr2376_device::perform_scan)
{
change_output_lines();
clock_scan_counters();
detect_keypress();
}
/* Keyboard Data */
uint8_t kr2376_device::data_r()
{
if (m_pins[KR2376_DSII])
return m_data ^ 0xff;
else
return m_data;
}