Mercurial > repos > blastem
annotate README @ 1189:75ba222877f7
Force IPV4 for GDB remote debugging on Windows. Bind to localhost instead of unspecified address since listening on external ports probably isn't a good idea in the general case
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Sun, 22 Jan 2017 19:40:32 -0800 |
| parents | dc05e3a7d8da |
| children | 262c0ce8f586 |
| rev | line source |
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| 1066 | 1 BlastEm 0.4.1 |
| 468 | 2 ------------- |
| 3 | |
| 4 Installation | |
| 5 ------------ | |
| 6 | |
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7 Extract this archive to a directory of your choosing. If you wish to change the |
| 1066 | 8 configuration settings, copy default.cfg to $HOME/.config/blastem/blastem.cfg |
| 9 and modify the copy. If you are on Windows, the config file should be placed in | |
| 10 %localappdata%\blastem. You may also whish to add the blastem directory to your | |
| 11 PATH environment variable. | |
| 12 | |
| 13 NOTE: Prior to version 0.4.1, BlastEm was still using Unixy locations for config | |
| 14 and save files. If you're upgrading from a previous version on Windows, you will | |
| 15 need to move them manually. For config files, the relevant paths are in the | |
| 16 previous paragraph. For save files, move all the directories found in | |
| 17 %userprofile%\.local\share\blastem to %localappdata%\blastem | |
| 468 | 18 |
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19 Usage |
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20 ----- |
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21 |
| 1013 | 22 This version of BlastEm has an experimental GUI that is implemented as a Genesis |
| 23 ROM running inside the emulator. This UI can be operated with either a mouse or | |
| 24 the first emulated gamepad. By default, both the keyboard and the first game | |
| 25 controller are mapped to said gamepad. For more information on bindings see the | |
| 26 Bindings section. | |
| 27 | |
| 28 Some operations are currently only supported through the command line. To get a | |
| 29 list of supported command line options on Linux or OSX type: | |
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30 |
| 1066 | 31 ./blastem -h |
| 32 | |
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33 From within your BlastEm directory. On Windows type: |
| 1066 | 34 |
| 35 blastem.exe -h | |
| 36 | |
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37 Lock-On Support |
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38 --------------- |
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39 |
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40 This version of BlastEm has some preliminary support for Sonic & Knuckles lock |
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41 on technology. This is only available from the command line at the moment. To |
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42 use it specify the Sonic & Knuckles ROM as the primary ROM and specify the ROM |
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43 to be locked on using the -o option. As an example: |
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44 |
| 1066 | 45 ./blastem ~/romz/sonic_and_knuckles.bin -o ~/romz/sonic3.bin |
| 46 | |
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47 Please note that Sonic 2 lock-on does not work at this time. Additionally the |
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48 save RAM added by Sonic 3 won't work either. |
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49 |
| 468 | 50 Configuration |
| 51 ------------- | |
| 52 | |
| 1066 | 53 Configuration is read from the file at $HOME/.config/blastem/blastem.cfg on |
| 54 Unix-like systems and %localappdata%\blastem\blastem.cfg if it exists. | |
| 55 Othwerise it is read from default.cfg from the same directory as the BlastEm | |
| 56 executable. Sections are denoted by a section name followed by an open curly | |
| 57 bracket, the section's contents and a closing curly bracket. Individual | |
| 468 | 58 configuration values are set by entering the value's name followed by a space |
| 59 or tab and followed by the desired value. | |
| 60 | |
| 61 Bindings | |
| 62 -------- | |
| 63 | |
| 64 The keys subsection of bindings maps keyboard keys to gamepad buttons or UI | |
| 65 actions. The key name goes on the left and the action is on the right. | |
| 1066 | 66 Most keys are named for the character they produce when pressed. For keys that |
| 67 don't correspond to a normal character, check the list below: | |
| 68 | |
| 69 Name | Description | |
| 70 ----------------- | |
| 71 up Up arrow | |
| 72 down Down arrow | |
| 73 left Left arrow | |
| 74 right Right arrow | |
| 75 space | |
| 76 tab | |
| 77 backspace Backspace on PC keyboards, Delete on Mac keyboards | |
| 78 esc | |
| 79 delete | |
| 80 lshift Left shift | |
| 81 rshift Right shift | |
| 82 lctrl Left control | |
| 83 rctrl Right control | |
| 84 lalt Left alt on PC keyboards, Option on Mac keyboards | |
| 85 ralt Right alt on PC keyboards, Option on Mac keyboards | |
| 86 home | |
| 87 end | |
| 88 pageup | |
| 89 pagedown | |
| 90 f1 | |
| 91 f2 | |
| 92 f3 | |
| 93 f4 | |
| 94 f5 | |
| 95 f6 | |
| 96 f7 | |
| 97 f8 | |
| 98 f9 | |
| 99 f10 | |
| 100 f11 | |
| 101 f12 | |
| 102 select | |
| 103 play | |
| 104 search | |
| 105 back | |
| 468 | 106 |
| 107 The pads subsection is used to map gamepads and joysticks. Analog axes are not | |
| 108 currently supported. An example configuration is provided in default.cfg to map | |
| 1013 | 109 SDL joystick 0 to the first controller and SDL joystick 1 to the second |
| 110 controller. The button assignments there work well for a 360 controller (at | |
| 111 least on Linux, it's possible the physical button to button number is different | |
| 112 on other operating systems). | |
| 113 | |
| 114 The mice subsection is used to map mice to emulated Mega/Sega mice. The default | |
| 115 configuration maps both the first and second host mice to the first emulated | |
| 116 mouse. This should not need modification for most users. | |
| 117 | |
| 118 One special mapping deserves a mention. By default, the 'r' key is mapped to | |
| 119 ui.release_mouse. When operating in windowed mode the mouse has a capture | |
| 120 behavior. Mouse events are ignored until you click in the window. The mouse | |
| 121 will then be "captured" and the cursor will be both made invisible and locked | |
| 122 to the window. The ui.release_mouse binding releases the mouse so it can be | |
| 123 used normally. | |
| 124 | |
| 125 IO | |
| 126 -- | |
| 127 | |
| 128 This section controls which peripherals are attached to the emulated console. | |
| 129 IO assignments can be overridden by the ROM database when appropriate. For | |
| 130 instance, games with mouse support can automatically use the mouse and games | |
| 131 that only support 3-button pads can automatically force an appropriate pad. | |
| 132 Unforunately, the ROM database is not yet exhaustive so manual configuration | |
| 133 may be needed here in some cases. | |
| 468 | 134 |
| 135 Video | |
| 136 ----- | |
| 137 | |
| 1013 | 138 The video section contains settings that affect the visual output of BlastEm. |
| 139 | |
| 140 "width" is used to control the window size when not in fullscreen mode. The | |
| 141 height of the window is calculated from this value. Both width and height can | |
| 142 be overridden from the command line. | |
| 143 | |
| 144 "vertex_shader" and "fragment_shader" define the GLSL shader program that | |
| 145 produces the final image for each frame. Shaders can be used to add various | |
| 146 visual effects or enhancements. Currently BlastEm only ships with the default | |
| 147 shader. If you write your own shaders, place them in | |
| 148 $HOME/.config/blastem/shaders and then specify the basename of the new shader | |
| 149 files in the "vertex_shader" and "fragment_shader" config options. Note that | |
| 150 shaders are not available in the SDL fallback renderer. | |
| 151 | |
| 152 "scanlines" controls whether there is any emulation of the gaps between display | |
| 153 lines that are present when driving a CRT television with a 240p signal. This | |
| 154 emulation is very basic at the moment so this option is off by default. | |
| 155 | |
| 156 "vsync" controls whether the drawing of frames is synchronized to the monitor | |
| 157 refresh rate. Valid values for this setting are "off", "on" and "tear". The | |
| 158 latter will attempt to use the "late tear" option if it's available and normal | |
| 159 vsync otherwise. Currently it's recommended to leave this at the default of | |
| 160 "off" as BlastEm synchronizes to audio and does not yet have the necessary code | |
| 161 to fully handle conflicts between the audio rate and monitor refresh rate. | |
| 162 Additionally, the "turbo" feature does not function properly with vsync | |
| 163 enabled. These issues will be addressed in a future release. If you wish to use | |
| 164 vsync, please see the VSync section at the bottom of the README. | |
| 468 | 165 |
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166 "fullscreen" controls whether BlastEm starts in fullscreen or windowed mode. |
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167 This can be overridden on the command line with the -f flag. If fullscreen |
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168 is set to "off", -f will turn it on. Conversely, if fullscreen is set to "on" |
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169 in the config, -f will turn it off. |
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170 |
| 468 | 171 Audio |
| 172 ----- | |
| 173 | |
| 1014 | 174 The audio section contains settings that affect the audio output of BlastEm. |
| 1013 | 175 |
| 176 "rate" selects the preferred sample rate for audio output. Your operating | |
| 177 system may not accept this value in which case a different rate will be chosen. | |
| 178 This should generally be either the native sample rate of your sound card or an | |
| 179 integral divisor of it. Most modern sound cards have a native output rate that | |
| 180 is a multiple of 48000 Hz so the default setting should work well for most users. | |
| 181 | |
| 182 "buffer size" controls how large of a buffer uses for audio data. Smaller values | |
| 183 will reduce latency, but too small of a value can lead to dropouts. 512 works | |
| 184 well for me, but a higher or lower value may be more appropriate for your system. | |
| 185 | |
| 186 "lowpass_cutoff" controls the cutoff, or knee, frequency of the RC-style | |
| 187 low-pass filter. The default value of 3390 Hz is supposedly what is present in | |
| 188 at least some Genesis/Megadrive models. Other models reportedly use an even | |
| 189 lower value. | |
| 468 | 190 |
| 1014 | 191 Clocks |
| 192 ------ | |
| 193 | |
| 194 The clocks section contains settings that affect how fast things run. | |
| 195 | |
| 196 "m68k_divider" describes the relationsip between the master clock (which is | |
| 197 53693175 Hz for NTSC mode and 53203395 Hz for PAL mode). The default value of 7 | |
| 198 matches the real hardware. Set this to a lower number to overclock the 68000 | |
| 199 and set it to a higher number to underclock it. | |
| 200 | |
| 201 "max_cycles" controls how often the system is forced to synchronize all | |
| 202 hardware. BlastEm generally uses a sync on demand approach to synchronizing | |
| 203 components in the system. This can provide perfect synchronization for most | |
| 204 components, but since the Z80 can steal cycles from the 68000 at unpredictable | |
| 205 times 68000/Z80 synchronization is imperfect. The default value of 3420 | |
| 206 corresponds to the number of master clock cycles per line. Larger numbers may | |
| 207 produce a modest performance improvement whereas smaller numbers will improve | |
| 208 68000/Z80 synchronization. | |
| 209 | |
| 210 "speeds" controls the speed of the overall emulated console at different | |
| 211 presets. Preset 0 is the default speed and should normally be set to 100. The | |
| 212 other presets enable the slow/turbo mode functionality. | |
| 213 | |
| 214 UI | |
| 215 -- | |
| 216 | |
| 217 The UI section contains settings that affect the graphical user interface. | |
| 218 | |
| 219 "rom" determines the path of the Genesis/Megadrive ROM that implements the UI. | |
| 220 Relative paths will be loaded relative to the BlastEm executable. | |
| 221 | |
| 222 Other Settings | |
| 223 -------------- | |
| 224 | |
| 225 "default_region" determines the console region that will be used when region | |
| 226 detection fails and when there are multiple valid regions. The default of 'U' | |
| 227 specifies a 60Hz "foreign" console. | |
| 228 | |
| 468 | 229 Debugger |
| 230 -------- | |
| 231 | |
| 232 BlastEm has an integrated command-line debugger loosely based on GDB's | |
| 233 interface. The interface is very rough at the moment. Available commands in the | |
| 234 68K debugger are: | |
| 1066 | 235 b ADDRESS - Set a breakpoint at ADDRESS |
| 236 d BREAKPOINT - Delete a 68K breakpoint | |
| 237 co BREAKPOINT - Run a list of debugger commands each time | |
| 1014 | 238 BREAKPOINT is hit |
| 1066 | 239 a ADDRESS - Advance to address |
| 240 n - Advance to next instruction | |
| 241 o - Advance to next instruction ignoring branches to | |
| 242 lower addresses (good for breaking out of loops) | |
| 243 s - Advance to next instruction (follows bsr/jsr) | |
| 244 c - Continue | |
| 245 bt - Print a backtrace | |
| 246 p[/(x|X|d|c)] VALUE - Print a register or memory location | |
| 247 di[/(x|X|d|c)] VALUE - Print a register or memory location each time | |
| 248 a breakpoint is hit | |
| 249 vs - Print VDP sprite list | |
| 250 vr - Print VDP register info | |
| 251 zb ADDRESS - Set a Z80 breakpoint | |
| 252 zp[/(x|X|d|c)] VALUE - Display a Z80 value | |
| 253 q - Quit BlastEm | |
| 468 | 254 Available commands in the Z80 debugger are: |
| 1066 | 255 b ADDRESS - Set a breakpoint at ADDRESS |
| 256 de BREAKPOINT - Delete a Z80 breakpoint | |
| 257 a ADDRESS - Advance to address | |
| 258 n - Advance to next instruction | |
| 259 c - Continue | |
| 260 p[/(x|X|d|c)] VALUE - Print a register or memory location | |
| 261 di[/(x|X|d|c)] VALUE - Print a register or memory location each time | |
| 262 a breakpoint is hit | |
| 263 q - Quit BlastEm | |
| 468 | 264 |
| 265 The -d flag can be used to cause BlastEm to start in the debugger. | |
| 266 Alternatively, you can use the ui.enter_debugger action (mapped to the 'u' key | |
| 1014 | 267 by default) to enter the debugger while a game is running. To debug the menu |
| 268 ROM, use the -dm flag. | |
| 468 | 269 |
| 536 | 270 GDB Remote Debugging |
| 271 -------------------- | |
| 272 | |
| 273 In addition to the native debugger, BlastEm can also act as a GDB remote | |
| 274 debugging stub. To use this, you'll want to configure your Makefile to produce | |
| 275 both an ELF executable and a raw binary. Invoke an m68k-elf targeted gdb with | |
| 276 the ELF file. Once inside the gdb session, type: | |
| 277 | |
| 1066 | 278 target remote | BLASTEM_PATH/blastem ROM_FILE.bin -D |
| 536 | 279 |
| 280 where BLASTEM_PATH is the relative or absolute path to your BlastEm | |
| 281 installation and ROM_FILE.bin is the name of the raw binary for your program. | |
| 282 BlastEm will halt at the beginning of your program's entry point and return | |
| 283 control to GDB. This will allow you to set breakpoints before your code runs. | |
| 284 | |
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285 On Windows, the procedure is slightly different. First run |
| 1066 | 286 blastem.exe ROM_FILE.bin -D |
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287 This will cause BlastEm to wait for a socket connection on port 1234. It will |
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288 appear to be frozen until gdb connects to it. Now open the ELF file in gdb |
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289 and type: |
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290 |
| 1066 | 291 target remote :1234 |
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292 |
| 536 | 293 Trace points and watch points are not currently supported. |
| 294 | |
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295 Included Tools |
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296 -------------- |
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297 |
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298 BlastEm ships with a few small utilities that leverage portions of the emulator |
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299 code. |
| 1066 | 300 |
| 301 dis - 68K disassembler | |
| 302 zdis - Z80 disassembler | |
| 303 vgmplay - Very basic VGM player | |
| 304 stateview - GST save state viewer | |
| 305 | |
| 1013 | 306 VSync |
| 307 ----- | |
| 308 | |
| 1014 | 309 This section includes information about using VSync with BlastEm. As mentioned |
| 310 above, the code is currently designed to only sync to audio and has some issues | |
| 311 with VSync as a result. That said, if your computer is fast enough and you | |
| 312 don't care about turbo mode, it can generally made to work. | |
| 313 | |
| 314 The native refresh rate of an NTSC Genesis is approximately 59.92 Hz which is | |
| 315 probably not the native refresh rate of your monitor. Fortunately, it is | |
| 316 most likely lower than your refresh rate. As long as this is true, VSync will | |
| 317 generally work as long as your computer is fast enough to cope with the time | |
| 318 lost waiting for VSync and the audio buffer is large enough to not run out of | |
| 319 samples during that delay. Latency will suffer a bit and you'll get a doubled | |
| 320 frame, but things will be fine. | |
| 321 | |
| 322 If you enable VSync and you're getting audio dropouts, first try doubling the | |
| 323 audio buffer setting. If you still experience dropouts, it's possible your | |
| 324 computer is not fast enough or that your monitor's actual refresh rate is in | |
| 325 fact lower than that of the emualted console. Not much can be done about the | |
| 326 former (apart from disabling VSync), but the latter can be dealt with by | |
| 327 lowering the default speed slightly in the "clocks" section. | |
| 328 | |
| 329 A future release will support VSync in a less hacky fashion. | |
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330 |
| 1066 | 331 Special Thanks |
| 332 -------------- | |
| 333 | |
| 334 My work has been made much easier by the contributions of those in the Genesis | |
| 335 community past and present. I'd like to thank the people below for their help. | |
| 336 | |
| 337 Nemesis - His work reverse engineering and documenting the VDP and | |
| 338 YM-2612 has saved me an immeasurable amount of time. I've | |
| 339 found both his sprite overflow test ROM and VDP FIFO | |
| 340 Testing ROM to be quite helpful. | |
| 341 | |
| 342 Charles MacDonald - While it hasn't been updated in a while, I still find his | |
| 343 VDP document to be my favorite reference. His Genesis | |
| 344 hardware document has also come in handy. | |
| 345 | |
| 346 Eke-Eke - Eke-Eke wrote a great document on the use of I2C EEPROM in | |
| 347 Genesis games and also left some useful very helpful | |
| 348 comments about problematic games in Genesis Plus GX | |
| 349 | |
| 350 Bart Trzynadlowski - His documents on the Genecyst save-state format and the | |
| 351 mapper used in Super Street Fighter 2 were definitely | |
| 352 appreciated. | |
| 353 | |
| 354 KanedaFR - Kaneda's SpritesMind forum is a great resource for the | |
| 355 Sega development community. | |
| 356 | |
| 357 I'd also like to thank the following people who have performed compatibility | |
| 358 testing or submitted helpful bug reports | |
| 359 | |
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360 micky, Sik, Tim Lawrence, ComradeOj, Vladikcomper |
| 1066 | 361 |
| 468 | 362 License |
| 363 ------- | |
| 364 | |
| 365 BlastEm is free software distributed under the terms of the GNU General Public | |
| 366 License version 3 or higher. This gives you the right to redistribute and/or | |
| 367 modify the program as long as you follow the terms of the license. See the file | |
| 368 COPYING for full license details. | |
| 369 | |
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370 Binary releases of BlastEm are packaged with GLEW and SDL2 which have thier own |
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371 licenses. See GLEW-LICENSE and SDL-LICENSE for details. |