1 // license:BSD-3-Clause
2 // copyright-holders:Roberto Lavarone
3 /**********************************************************************
4
5 SMC KR2376 Keyboard Encoder emulation
6
7 **********************************************************************/
8
9 #include "emu.h"
10 #include "kr2376.h"
11
12
13 DEFINE_DEVICE_TYPE(KR2376_ST, kr2376_st_device, "kr2376_st", "SMC KR2376-ST Keyboard Encoder")
14 //DEFINE_DEVICE_TYPE(KR2376_12, kr2376_12_device, "kr2376_12", "SMC KR2376-12 Keyboard Encoder")
15
kr2376_device(const machine_config & mconfig,device_type type,const char * tag,device_t * owner,uint32_t clock)16 kr2376_device::kr2376_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
17 device_t(mconfig, type, tag, owner, clock),
18 m_read_x(*this),
19 m_read_shift(*this),
20 m_read_control(*this),
21 m_write_strobe(*this)
22 {
23 }
24
kr2376_st_device(const machine_config & mconfig,const char * tag,device_t * owner,uint32_t clock)25 kr2376_st_device::kr2376_st_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
26 : kr2376_device(mconfig, KR2376_ST, tag, owner, clock)
27 {
28 }
29
key_codes(int mode,int x,int y)30 uint8_t kr2376_st_device::key_codes(int mode, int x, int y)
31 {
32 static const uint8_t KEY_CODES[3][8][11] =
33 {
34 // normal
35 {
36 // Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
37 // NUL SOH STX ETX EOT ENQ ACK BEL DC1 P O X0
38 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x11, 0x50, 0x30 }, // X0
39 // DLE K L N M NAK SYN ETB CAN EM SUB X1
40 { 0x10, 0x4b, 0x4c, 0x4e, 0x4d, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a }, // X1
41 // - FS GS RS US < > , SP . _ X2
42 { 0x2d, 0x1c, 0x1d, 0x1e, 0x1f, 0x3c, 0x3e, 0x2c, 0x20, 0x2e, 0x5f }, // X2
43 // 0 : p _ @ BS [ ] CR LF DEL X3
44 { 0x30, 0x3a, 0x70, 0x5f, 0x40, 0x08, 0x5B, 0x5d, 0x0d, 0x0a, 0x7f }, // X3
45 { 0x3b, 0x2f, 0x2e, 0x2c, 0x6d, 0x6e, 0x62, 0x76, 0x63, 0x78, 0x7a }, // X4
46 { 0x6c, 0x6b, 0x6a, 0x68, 0x67, 0x66, 0x64, 0x73, 0x61, 0x0c, 0x1b }, // X5
47 { 0x6f, 0x69, 0x75, 0x79, 0x74, 0x72, 0x65, 0x77, 0x71, 0x09, 0x0b }, // X6
48 { 0x39, 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31, 0x5e, 0x5c } // X7
49 },
50
51 // shift
52 {
53 // Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
54 // NUL SOH STX ETX EOT ENQ ACK BEL DC1 @ _ X0
55 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x11, 0x40, 0x5f }, // X0
56 // DLE [ \ ^ ] NAK SYN ETB CAN EM SUB X1
57 { 0x10, 0x5b, 0x5c, 0x5e, 0x5d, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a }, // X1
58 // = FS GS RS US < > , SP . _ X2
59 { 0x3d, 0x1c, 0x1d, 0x1e, 0x1f, 0x3c, 0x3e, 0x2c, 0x20, 0x2e, 0x5f }, // X2
60 // NUL * P DEL ` BS { } CR LF DEL X3
61 { 0x00, 0x2a, 0x50, 0x7f, 0x60, 0x08, 0x7b, 0x7d, 0x0d, 0x0a, 0x7f }, // X3
62 { 0x2b, 0x3f, 0x3e, 0x3c, 0x4d, 0x4e, 0x42, 0x56, 0x43, 0x58, 0x5a }, // X4
63 { 0x4c, 0x4b, 0x4a, 0x48, 0x47, 0x46, 0x44, 0x53, 0x41, 0x0c, 0x1b }, // X5
64 { 0x4f, 0x49, 0x55, 0x59, 0x54, 0x52, 0x45, 0x57, 0x51, 0x09, 0x0b }, // X6
65 { 0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21, 0x7e, 0x7c } // X7
66 },
67
68 // control
69 {
70 // Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
71 // NUL SOH STX ETX EOT ENQ ACK BEL DC1 DLE SI X0
72 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x11, 0x10, 0x0f }, // X0
73 // DLE VT FF SO CR NAK SYN ETB CAN EM SUB X1
74 { 0x10, 0x0b, 0x0c, 0x0e, 0x0d, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a }, // X1
75 // NUL FS GS RS US NUL NUL NUL SP NUL US X2
76 { 0x00, 0x1c, 0x1d, 0x1e, 0x1f, 0x00, 0x00, 0x00, 0x20, 0x00, 0x1f }, // X2
77 // NUL NUL DLE US NUL BS ESC GS CR LF DEL X3
78 { 0x00, 0x00, 0x10, 0x1f, 0x00, 0x08, 0x1B, 0x1d, 0x0d, 0x0a, 0x7f }, // X3
79 { 0x00, 0x00, 0x00, 0x00, 0x1d, 0x0e, 0x02, 0x16, 0x03, 0x18, 0x1a }, // X4
80 { 0x0c, 0x0b, 0x0a, 0x08, 0x07, 0x06, 0x04, 0x13, 0x01, 0x0c, 0x1b }, // X5
81 { 0x1f, 0x09, 0x15, 0x19, 0x14, 0x12, 0x05, 0x17, 0x11, 0x09, 0x0b }, // X6
82 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x1c } // X7
83 }
84 };
85 return KEY_CODES[mode][x][y];
86 }
87
88 // TODO: determine ROM contents of KR2376-12
89 //kr2376_12_device::kr2376_12_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
90 // : kr2376_device(mconfig, KR2376_12, tag, owner, clock)
91 //{}
92 //uint8_t kr2376_12_device::key_codes(int mode, int x, int y)
93 //{
94 // static const uint8_t KEY_CODES[3][8][11] =
95 // {
96 // // normal
97 // {
98 // // Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
99 // { 0x33, 0x32, 0x31, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00 }, // X0
100 // { 0x36, 0x35, 0x34, 0x7d, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // X1
101 // { 0x39, 0x38, 0x37, 0x5b, 0x02, 0x00, 0x00, 0x1b, 0x00, 0x00, 0x00 }, // X2
102 // { 0x08, 0x0a, 0x09, 0x0b, 0x00, 0x7c, 0x00, 0x00, 0x0d, 0x20, 0x00 }, // X3
103 // { 0x2d, 0x2f, 0x2e, 0x2c, 0x6d, 0x6e, 0x62, 0x76, 0x63, 0x78, 0x7a }, // X4
104 // { 0x3a, 0x3b, 0x6c, 0x6b, 0x6a, 0x68, 0x67, 0x66, 0x64, 0x73, 0x61 }, // X5
105 // { 0x60, 0x70, 0x6f, 0x69, 0x75, 0x79, 0x74, 0x72, 0x65, 0x77, 0x71 }, // X6
106 // { 0x2d, 0x30, 0x39, 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31 } // X7
107 // },
108 //
109 // // shift
110 // {
111 // // Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
112 // { 0x33, 0x32, 0x31, 0x00, 0x00, 0x5e, 0x00, 0x00, 0x00, 0x00, 0x00 }, // X0
113 // { 0x36, 0x35, 0x34, 0x5d, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // X1
114 // { 0x39, 0x38, 0x37, 0x7b, 0x04, 0x00, 0x00, 0x1b, 0x00, 0x00, 0x00 }, // X2
115 // { 0x08, 0x0a, 0x09, 0x0b, 0x00, 0x5c, 0x00, 0x00, 0x0d, 0x20, 0x00 }, // X3
116 // { 0x2d, 0x3f, 0x3e, 0x3c, 0x4d, 0x4e, 0x42, 0x56, 0x43, 0x58, 0x5a }, // X4
117 // { 0x2a, 0x2b, 0x4c, 0x4b, 0x4a, 0x48, 0x47, 0x46, 0x44, 0x53, 0x41 }, // X5
118 // { 0x40, 0x50, 0x4f, 0x49, 0x55, 0x59, 0x54, 0x52, 0x45, 0x57, 0x51 }, // X6
119 // { 0x3d, 0x30, 0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21 } // X7
120 // },
121 //
122 // // control
123 // {
124 // // Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10
125 // { 0x33, 0x32, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // X0
126 // { 0x36, 0x35, 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // X1
127 // { 0x39, 0x38, 0x37, 0x00, 0x00, 0x00, 0x00, 0x1b, 0x00, 0x00, 0x00 }, // X2
128 // { 0x08, 0x0a, 0x09, 0x0b, 0x00, 0x00, 0x00, 0x00, 0x0d, 0x20, 0x00 }, // X3
129 // { 0x1f, 0x2f, 0x2e, 0x2c, 0x0d, 0x0e, 0x02, 0x16, 0x03, 0x18, 0x1a }, // X4
130 // { 0x3a, 0x3b, 0x0c, 0x0b, 0x0a, 0x08, 0x07, 0x06, 0x04, 0x13, 0x01 }, // X5
131 // { 0x00, 0x10, 0x0f, 0x09, 0x15, 0x19, 0x14, 0x12, 0x05, 0x17, 0x11 }, // X6
132 // { 0x2d, 0x30, 0x39, 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31 } // X7
133 // }
134 // };
135 // return KEY_CODES[mode][x][y];
136 //}
137
138 //-------------------------------------------------
139 // device_start - device-specific startup
140 //-------------------------------------------------
141
device_start()142 void kr2376_device::device_start()
143 {
144 /* resolve callbacks */
145 m_read_x.resolve_all_safe(0x7ff);
146 m_read_shift.resolve_safe(0);
147 m_read_control.resolve_safe(0);
148 m_write_strobe.resolve_safe();
149
150 /* set initial values */
151 m_ring11 = 0;
152 m_ring8 = 0;
153 m_strobe = 0;
154 m_strobe_old = 0;
155 m_parity = 0;
156 m_data = 0;
157 memset(m_pins, 0x00, sizeof(m_pins));
158 change_output_lines();
159
160 /* create the timers */
161 m_scan_timer = timer_alloc(TIMER_SCAN_TICK);
162 m_scan_timer->adjust(attotime::zero, 0, attotime::from_hz(clock()));
163
164 /* register for state saving */
165 save_item(NAME(m_pins));
166 save_item(NAME(m_ring11));
167 save_item(NAME(m_ring8));
168 save_item(NAME(m_strobe));
169 save_item(NAME(m_strobe_old));
170 save_item(NAME(m_parity));
171 save_item(NAME(m_data));
172 }
173
174 /*-------------------------------------------------
175 set_input_pin - set an input pin
176 -------------------------------------------------*/
set_input_pin(input_pin_t pin,int data)177 void kr2376_device::set_input_pin( input_pin_t pin, int data )
178 {
179 data = data ? 1 : 0;
180 switch ( pin )
181 {
182 case KR2376_PII:
183 case KR2376_DSII:
184 m_pins[pin] = data;
185 break;
186 }
187 }
188
189
190 /*-------------------------------------------------
191 get_output_pin - get the status of an output pin
192 -------------------------------------------------*/
get_output_pin(output_pin_t pin)193 int kr2376_device::get_output_pin( output_pin_t pin )
194 {
195 return m_pins[pin];
196 }
197
198
change_output_lines()199 void kr2376_device::change_output_lines()
200 {
201 if (m_strobe != m_strobe_old)
202 {
203 m_strobe_old = m_strobe;
204
205 if (m_strobe) // strobe 0 --> 1 transition
206 {
207 /* update parity */
208 m_pins[KR2376_PO] = m_parity ^ m_pins[KR2376_PII];
209 }
210 m_pins[KR2376_SO] = m_strobe ^ m_pins[KR2376_DSII];
211 m_write_strobe(m_strobe ^ m_pins[KR2376_DSII]);
212 }
213 }
214
clock_scan_counters()215 void kr2376_device::clock_scan_counters()
216 {
217 /* ring counters inhibited while strobe active */
218 if (!m_strobe)
219 {
220 m_ring11++;
221 if (m_ring11 == 11)
222 {
223 m_ring11 = 0;
224 m_ring8++;
225 if (m_ring8 == 8)
226 m_ring8 = 0;
227 }
228 }
229 }
230
detect_keypress()231 void kr2376_device::detect_keypress()
232 {
233 if (m_read_x[m_ring8]() == (1 << m_ring11))
234 {
235 m_strobe = 1;
236 /* strobe 0->1 transition, encode char and update parity */
237 if (!m_strobe_old)
238 {
239 int i;
240 int parbit;
241 int shift = m_read_shift();
242 int control = m_read_control();
243 int table = 0;
244
245 if (shift)
246 table = 1;
247 else if (control)
248 table = 2;
249
250 m_data = key_codes(table, m_ring8, m_ring11);
251
252 /* Compute ODD parity */
253 m_parity = m_data;
254 parbit = 0;
255 for (i=0; i<8; i++)
256 parbit ^= (m_parity >> i) & 1;
257 m_parity = parbit;
258 }
259 }
260 else
261 {
262 m_strobe = 0;
263 }
264 }
265
device_timer(emu_timer & timer,device_timer_id id,int param,void * ptr)266 void kr2376_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
267 {
268 switch (id)
269 {
270 case TIMER_SCAN_TICK:
271 change_output_lines();
272 clock_scan_counters();
273 detect_keypress();
274 break;
275 }
276 }
277
278 /* Keyboard Data */
279
data_r()280 uint8_t kr2376_device::data_r()
281 {
282 if (m_pins[KR2376_DSII])
283 return m_data ^ 0xff;
284 else
285 return m_data;
286 }
287