1 /*
2 * libtilemcore - Graphing calculator emulation library
3 *
4 * Copyright (C) 2001 Solignac Julien
5 * Copyright (C) 2004-2009 Benjamin Moody
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public License
9 * as published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see
19 * <http://www.gnu.org/licenses/>.
20 */
21
22 #ifdef HAVE_CONFIG_H
23 # include <config.h>
24 #endif
25
26 #include <stdio.h>
27 #include <tilem.h>
28
29 #include "x2.h"
30
x2_z80_in(TilemCalc * calc,dword port)31 byte x2_z80_in(TilemCalc* calc, dword port)
32 {
33 static const byte battlevel[4] = { 33, 39, 36, 43 };
34 byte v, b;
35
36 switch(port&0xff) {
37 case 0x00:
38 v = tilem_linkport_get_lines(calc);
39
40 if (calc->hwregs[HW_VERSION] == 1) {
41 /* HW version 1 uses separate PCR/PDR, as the
42 TI-85 does. */
43 b = (calc->hwregs[PORT0] >> 4) | 0xf0;
44 return ((calc->hwregs[PORT0] & b) | (v & ~b));
45 }
46 else {
47 /* HW version 2 uses a TI-83-like interface.
48 (Do the same if version is unknown, because
49 most code written for HW version 1 will
50 work fine with these values.) */
51 return (0xc0 | (v * 5));
52 }
53
54 case 0x01:
55 return(tilem_keypad_read_keys(calc));
56
57 case 0x02:
58 return(calc->hwregs[PORT2]);
59
60 case 0x03:
61 v = (calc->keypad.onkeydown ? 0x00: 0x08);
62
63 if (calc->z80.interrupts & TILEM_INTERRUPT_ON_KEY)
64 v |= 0x01;
65 if (calc->z80.interrupts & TILEM_INTERRUPT_TIMER1)
66 v |= 0x02;
67
68 return(v);
69
70 case 0x10:
71 return(tilem_lcd_t6a04_status(calc));
72
73 case 0x11:
74 return(tilem_lcd_t6a04_read(calc));
75
76 case 0x14:
77 /* FIXME: determine value of this port on old
78 hardware, and the values of bits 1-7. (As on
79 TI-83, probably mirrors port 0 in both cases.) */
80 b = battlevel[calc->hwregs[PORT4] >> 6];
81 return(calc->battery >= b ? 1 : 0);
82 }
83
84 tilem_warning(calc, "Input from port %x", port);
85 return(0x00);
86 }
87
88
setup_mapping(TilemCalc * calc)89 static void setup_mapping(TilemCalc* calc)
90 {
91 unsigned int pageA, pageB;
92
93 /* FIXME: this is all rather hypothetical and untested, but it
94 makes sense based on how the TI-83 works */
95
96 if (calc->hwregs[PORT2] & 0x40) {
97 pageA = (0x08 | (calc->hwregs[PORT2] & 1));
98 }
99 else {
100 pageA = (calc->hwregs[PORT2] & 7);
101 }
102
103 if (calc->hwregs[PORT2] & 0x80) {
104 pageB = (0x08 | ((calc->hwregs[PORT2] >> 3) & 1));
105 }
106 else {
107 pageB = ((calc->hwregs[PORT2] >> 3) & 7);
108 }
109
110 if (calc->hwregs[PORT4] & 1) {
111 calc->mempagemap[1] = (pageA & ~1);
112 calc->mempagemap[2] = (pageA | 1);
113 calc->mempagemap[3] = pageB;
114 }
115 else {
116 calc->mempagemap[1] = pageA;
117 calc->mempagemap[2] = pageB;
118 calc->mempagemap[3] = 0x08;
119 }
120 }
121
x2_z80_out(TilemCalc * calc,dword port,byte value)122 void x2_z80_out(TilemCalc* calc, dword port, byte value)
123 {
124 switch(port&0xff) {
125 case 0x00:
126 calc->hwregs[PORT0] = value;
127
128 if (calc->hwregs[HW_VERSION] == 1) {
129 /* HW version 1 */
130 value = (((value >> 6) & (value >> 2))
131 | ((value >> 4) & ~value));
132 }
133 else if (calc->hwregs[HW_VERSION] == 0) {
134 /* HW version unknown: auto-detect */
135 if ((value & 0xc3) == 0xc0) {
136 value = ((value >> 2) | (value >> 4));
137 }
138 }
139
140 tilem_linkport_set_lines(calc, value);
141 break;
142
143 case 0x01:
144 tilem_keypad_set_group(calc, value);
145 break;
146
147 case 0x02:
148 calc->hwregs[PORT2] = value;
149 setup_mapping(calc);
150 break;
151
152 case 0x03:
153 if (value & 0x01) {
154 calc->keypad.onkeyint = 1;
155 }
156 else {
157 calc->z80.interrupts &= ~TILEM_INTERRUPT_ON_KEY;
158 calc->keypad.onkeyint = 0;
159 }
160
161 if (!(value & 0x02)) {
162 calc->z80.interrupts &= ~TILEM_INTERRUPT_TIMER1;
163 }
164
165 calc->poweronhalt = ((value & 8) >> 3);
166 calc->hwregs[PORT3] = value;
167 break;
168
169 case 0x04:
170 calc->hwregs[PORT4] = value;
171
172 /* Detect hardware version */
173 if (calc->z80.r.pc.d < 0x4000) {
174 if (value & 0x10)
175 calc->hwregs[HW_VERSION] = 1;
176 else
177 calc->hwregs[HW_VERSION] = 2;
178 }
179
180 /* FIXME: implement changing interrupt frequencies --
181 somebody needs to measure them. Also check if bit
182 4 works as on 83. */
183
184 setup_mapping(calc);
185 break;
186
187 case 0x10:
188 tilem_lcd_t6a04_control(calc, value);
189 break;
190
191 case 0x11:
192 tilem_lcd_t6a04_write(calc, value);
193 break;
194 }
195
196 return;
197 }
198
x2_z80_ptimer(TilemCalc * calc,int id)199 void x2_z80_ptimer(TilemCalc* calc, int id)
200 {
201 switch (id) {
202 case TIMER_INT:
203 if (calc->hwregs[PORT3] & 0x02)
204 calc->z80.interrupts |= TILEM_INTERRUPT_TIMER1;
205 break;
206 }
207 }
208