-
Notifications
You must be signed in to change notification settings - Fork 0
/
machine.cpp
281 lines (230 loc) · 6.99 KB
/
machine.cpp
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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
// =========================================================================
// Copyright (C) 2009-2024 by Anders Piniesjö <[email protected]>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>
// =========================================================================
#include <iostream>
#include <cstdlib>
#include <thread>
#include <sys/time.h>
#include <unistd.h>
#include <boost/assign.hpp>
#include <SDL.h>
#include "machine.hpp"
#include "oric.hpp"
#include "frontend.hpp"
// VIA Lines Oric usage
// ---------- ---------------------------------
// PA0..PA7 PSG data bus, printer data lines
// CA1 printer acknowledge line
// CA2 PSG BC1 line
// PB0..PB2 keyboard lines-demultiplexer
// PB3 keyboard sense line
// PB4 printer strobe line
// PB5 (not connected)
// PB6 tape connector motor control
// PB7 tape connector output
// CB1 tape connector input
// CB2 PSG BDIR line
// 19968 cycles per frame / 312 lines = 64 cycles per raster
constexpr uint8_t cycles_per_raster = 64;
constexpr uint32_t sound_pause_target = 1000;
Machine::Machine(Oric* oric) :
ula(this, &memory, Frontend::texture_width, Frontend::texture_height, Frontend::texture_bpp),
oric(oric),
memory(65535),
tape(nullptr),
cycle_count(0),
next_frame(0),
warpmode_on(false),
break_exec(false),
sound_paused(true),
sound_pause_counter(0),
current_key_row(0)
{
for (uint8_t i=0; i < 8; i++) {
key_rows[i] = 0;
}
}
Machine::~Machine()
{}
void Machine::init(Frontend* frontend)
{
this->frontend = frontend;
init_cpu();
init_mos6522();
init_ay3();
init_tape();
}
void Machine::init_cpu()
{
cpu = new MOS6502(*this);
cpu->memory_read_byte_handler = read_byte;
cpu->memory_read_byte_zp_handler = read_byte_zp;
cpu->memory_read_word_handler = read_word;
cpu->memory_read_word_zp_handler = read_word_zp;
cpu->memory_write_byte_handler = write_byte;
cpu->memory_write_byte_zp_handler = write_byte_zp;
}
void Machine::init_mos6522()
{
mos_6522 = new MOS6522(*this);
// CA1 is connected to printer ACK line.
// -- printer not supported.
mos_6522->orb_changed_handler = via_orb_changed_callback;
// CA2 is connected to AY BC1 line.
mos_6522->ca2_changed_handler = AY3_8912::set_bc1_callback;
// CB1 is connected to tape connector input, tape_tap.cpp writes directly to CB1.
// CB2 is connected to AY BDIR line.
mos_6522->cb2_changed_handler = AY3_8912::set_bdir_callback;
mos_6522->psg_changed_handler = AY3_8912::update_state_callback;
mos_6522->irq_handler = irq_callback;
mos_6522->irq_clear_handler = irq_clear_callback;
}
void Machine::init_ay3()
{
ay3 = new AY3_8912(*this);
// AY data bus reads from VIA ORA (Output Register A).
ay3->m_read_data_handler = read_via_ora;
// ay3->m_write_data_handler = write_vi
}
void Machine::init_tape()
{
if (! oric->get_config().tape_path().empty()) {
tape = new TapeTap(*mos_6522, oric->get_config().tape_path());
if (!tape->init()) {
exit(1);
}
}
else {
std::cout << "No tape specified." << std::endl;
tape = new TapeBlank();
}
}
void Machine::reset()
{
cpu->Reset();
}
void Machine::run(Oric* oric)
{
uint32_t instructions = 0;
struct timeval tv;
gettimeofday(&tv, NULL);
next_frame = tv.tv_sec * 1000000 + tv.tv_usec;
break_exec = false;
uint8_t ran = 0;
cycle_count += cycles_per_raster;
while (! break_exec) {
if (sound_paused) {
sound_pause_counter += 1;
if (sound_pause_counter > sound_pause_target) {
sound_paused = false;
frontend->pause_sound(false);
}
}
while (cycle_count > 0) {
tape->exec();
mos_6522->exec();
ay3->exec();
if (cpu->exec(break_exec)) {
update_key_output();
// frontend->unlock_audio();
}
if (break_exec) {
oric->do_break();
return;
}
--cycle_count;
}
if (ula.paint_raster()) {
next_frame += 20000;
if (! frontend->handle_frame()) {
break_exec = true;
}
gettimeofday(&tv, NULL);
uint64_t now = tv.tv_sec * 1000000 + tv.tv_usec + 20000;
if (now > next_frame) {
next_frame = now;
}
else {
if (! warpmode_on) {
usleep(next_frame - now);
}
}
}
cycle_count += cycles_per_raster;
}
}
void Machine::key_press(uint8_t key_bits, bool down)
{
if (down) {
key_rows[key_bits >> 3] |= (1 << (key_bits & 0x07));
}
else {
key_rows[key_bits >> 3] &= ~(1 << (key_bits & 0x07));
}
}
void Machine::update_key_output()
{
current_key_row = mos_6522->read_orb() & 0x07;
if (! (ay3->get_register(AY3_8912::ENABLE) & 0x40))
{
mos_6522->set_irb_bit(3, false);
return;
}
if (key_rows[current_key_row] & (ay3->get_register(AY3_8912::IO_PORT_A) ^ 0xff)) {
mos_6522->set_irb_bit(3, true);
}
else {
mos_6522->set_irb_bit(3, false);
}
}
void Machine::via_orb_changed(uint8_t orb)
{
bool motor_on = orb & 0x40;
if (motor_on != tape->is_motor_running()) {
tape->set_motor(motor_on);
}
}
void Machine::save_snapshot()
{
cpu->save_to_snapshot(snapshot);
mos_6522->save_to_snapshot(snapshot);
memory.save_to_snapshot(snapshot);
ay3->save_to_snapshot(snapshot);
std::cout << "Saved snapshot." << std::endl;
}
void Machine::load_snapshot()
{
cpu->load_from_snapshot(snapshot);
mos_6522->load_from_snapshot(snapshot);
memory.load_from_snapshot(snapshot);
ay3->load_from_snapshot(snapshot);
std::cout << "Loaded snapshot." << std::endl;
}
bool Machine::toggle_warp_mode()
{
warpmode_on = !warpmode_on;
if (! warpmode_on) {
struct timeval tv;
gettimeofday(&tv, NULL);
next_frame = tv.tv_sec * 1000000 + tv.tv_usec;
frontend->unlock_audio();
}
else {
frontend->lock_audio();
}
std::cout << "Warp mode: " << (warpmode_on ? "on" : "off") << std::endl;
return warpmode_on;
}