Mercurial > repos > blastem
annotate README @ 1354:34798ad9c570
Updated special thanks and version number listed in menu ROM
| author | Michael Pavone <pavone@retrodev.com> |
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| date | Wed, 10 May 2017 19:32:13 -0700 |
| parents | 52d9e3c36b4f |
| children | 59e1dbb795a7 |
| rev | line source |
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1 BlastEm 0.5.0 |
| 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 |
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107 The pads subsection is used to map gamepads and joysticks. Gamepads that are |
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108 recognized, can have their buttons and axes mapped with semantic names. |
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109 Xbox 360, PS4 and PS3 style names are supported. Unrecognized gamepads can be |
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110 mapped using numeric button and axis ids. The following button names are |
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111 recognized by BlastEm: |
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112 a, cross |
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113 b, circle |
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114 x, square |
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115 y, trinagle |
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116 start, options |
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117 back, select, share |
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118 guide |
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119 leftbutton, l1 |
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120 rightbutton, r1 |
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121 leftstick, l3 |
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122 rightstick, r3 |
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123 The following axis names are recognized by BlastEm: |
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124 leftx |
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125 lefty |
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126 rightx |
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127 righty |
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128 lefttrigger, l2 |
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129 righttrigger, r2 |
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130 |
| 1013 | 131 |
| 132 The mice subsection is used to map mice to emulated Mega/Sega mice. The default | |
| 133 configuration maps both the first and second host mice to the first emulated | |
| 134 mouse. This should not need modification for most users. | |
| 135 | |
| 136 One special mapping deserves a mention. By default, the 'r' key is mapped to | |
| 137 ui.release_mouse. When operating in windowed mode the mouse has a capture | |
| 138 behavior. Mouse events are ignored until you click in the window. The mouse | |
| 139 will then be "captured" and the cursor will be both made invisible and locked | |
| 140 to the window. The ui.release_mouse binding releases the mouse so it can be | |
| 141 used normally. | |
| 142 | |
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143 UI Actions |
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144 ---------- |
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145 |
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146 This section lists the various "UI" actions that can be triggered by a key or |
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147 gamepad binding. |
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148 |
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149 ui.release_mouse Releases the mouse if it is currently captured |
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150 ui.vdp_debug_mode Cycles through the various VDP debug views |
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151 ui.vdp_debug_pal Cycles through the selected palette when viewing |
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152 the VDP memory viewer |
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153 ui.enter_debugger Enters the debugger for the main CPU of the |
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154 currently emulated system |
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155 ui.screenshot Takes an internal screenshot |
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156 ui.exit Returns to the menu ROM if currently in a game |
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157 that was launched from the menu. Exits otherwise |
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158 ui.save_state Saves a savestate to the quicksave slot |
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159 ui.set_speed.N Selects a specific machine speed specified by N |
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160 which should be a number between 0-9. Speeds are |
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161 specified in the "clocks" section of the config |
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162 ui.next_speed Selects the next machine speed |
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163 ui.prev_speed Selects the previous machine speed |
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164 ui.toggle_fullscreen Toggles between fullscreen and windowed mode |
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165 ui.soft_reset Resets a portion of the emulated machine |
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166 Equivalent to pushing the reset button on the |
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167 emulated device |
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168 ui.toggle_keyboard_captured Toggles the capture state of the host keyboard |
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169 when an emulated keyboard is present |
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170 |
| 1013 | 171 IO |
| 172 -- | |
| 173 | |
| 174 This section controls which peripherals are attached to the emulated console. | |
| 175 IO assignments can be overridden by the ROM database when appropriate. For | |
| 176 instance, games with mouse support can automatically use the mouse and games | |
| 177 that only support 3-button pads can automatically force an appropriate pad. | |
| 178 Unforunately, the ROM database is not yet exhaustive so manual configuration | |
| 179 may be needed here in some cases. | |
| 468 | 180 |
| 181 Video | |
| 182 ----- | |
| 183 | |
| 1013 | 184 The video section contains settings that affect the visual output of BlastEm. |
| 185 | |
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186 "aspect" is used to control the aspect ratio of the emulated display. The |
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187 default of 4:3 matches that of a standard definition television. |
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188 |
| 1013 | 189 "width" is used to control the window size when not in fullscreen mode. The |
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190 height of the window is calculated from this value and "aspect". Both width |
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191 and height can be overridden from the command line. |
| 1013 | 192 |
| 193 "vertex_shader" and "fragment_shader" define the GLSL shader program that | |
| 194 produces the final image for each frame. Shaders can be used to add various | |
| 195 visual effects or enhancements. Currently BlastEm only ships with the default | |
| 196 shader. If you write your own shaders, place them in | |
| 197 $HOME/.config/blastem/shaders and then specify the basename of the new shader | |
| 198 files in the "vertex_shader" and "fragment_shader" config options. Note that | |
| 199 shaders are not available in the SDL fallback renderer. | |
| 200 | |
| 201 "scanlines" controls whether there is any emulation of the gaps between display | |
| 202 lines that are present when driving a CRT television with a 240p signal. This | |
| 203 emulation is very basic at the moment so this option is off by default. | |
| 204 | |
| 205 "vsync" controls whether the drawing of frames is synchronized to the monitor | |
| 206 refresh rate. Valid values for this setting are "off", "on" and "tear". The | |
| 207 latter will attempt to use the "late tear" option if it's available and normal | |
| 208 vsync otherwise. Currently it's recommended to leave this at the default of | |
| 209 "off" as BlastEm synchronizes to audio and does not yet have the necessary code | |
| 210 to fully handle conflicts between the audio rate and monitor refresh rate. | |
| 211 Additionally, the "turbo" feature does not function properly with vsync | |
| 212 enabled. These issues will be addressed in a future release. If you wish to use | |
| 213 vsync, please see the VSync section at the bottom of the README. | |
| 468 | 214 |
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215 "fullscreen" controls whether BlastEm starts in fullscreen or windowed mode. |
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216 This can be overridden on the command line with the -f flag. If fullscreen |
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217 is set to "off", -f will turn it on. Conversely, if fullscreen is set to "on" |
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218 in the config, -f will turn it off. |
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219 |
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220 "gl" controls whether OpenGL is used for rendering. The default value is on. |
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221 If it is set to off instead, the fallback renderer which uses SDL2's render API |
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222 will be used instead. This option is mostly useful for users on hardware that |
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223 lacks OpenGL 2 support. While BlastEm will fall back automatically even if gl |
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224 is set to on there will be a warning. Disabling gl eliminates this warning. |
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225 |
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226 The "ntsc" and "pal" sub-sections control overscan settings for the emulated |
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227 video output for NTSC and PAL consoles respectively. More details are available |
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228 in the Overscan section. |
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229 |
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230 Overscan |
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231 -------- |
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232 |
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233 Analog televisions generally don't display the entirety of a video frame. Some |
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234 portion is cropped at the edges of the display. This is called overscan. |
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235 Unfortunately, the amount of cropping performed varies considerably and is even |
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236 adjustable on many TV sets. To deal with this, BlastEm allows overscan to be |
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237 customized. |
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238 |
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239 Overscan values are specified in the "ntsc" and "pal" sub-sections of the |
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240 "video" section of the config file. The "overscan" sub-section contains four |
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241 settings for specifying the number of pixels cropped on each side of the |
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242 display: "top", "bottom", "left" and "right". |
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243 |
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244 The default settings hide the horizontal border completely for both NTSC and |
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245 PAL consoles. For the vertical borders, the NTSC overscan settings are chosen |
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246 to give square pixels with the default aspect ratio of 4:3. For PAL, the |
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247 default settings are set so that the PAL-exclusive V30 mode will produce a |
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248 visible border that is the same size as what is shown in V28 mode in NTSC. This |
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249 results in a slightly squished picture compared to NTSC which is probably |
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250 appropriate given that a PAL display has more lines than an NTSC one. |
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251 |
| 468 | 252 Audio |
| 253 ----- | |
| 254 | |
| 1014 | 255 The audio section contains settings that affect the audio output of BlastEm. |
| 1013 | 256 |
| 257 "rate" selects the preferred sample rate for audio output. Your operating | |
| 258 system may not accept this value in which case a different rate will be chosen. | |
| 259 This should generally be either the native sample rate of your sound card or an | |
| 260 integral divisor of it. Most modern sound cards have a native output rate that | |
| 261 is a multiple of 48000 Hz so the default setting should work well for most users. | |
| 262 | |
| 263 "buffer size" controls how large of a buffer uses for audio data. Smaller values | |
| 264 will reduce latency, but too small of a value can lead to dropouts. 512 works | |
| 265 well for me, but a higher or lower value may be more appropriate for your system. | |
| 266 | |
| 267 "lowpass_cutoff" controls the cutoff, or knee, frequency of the RC-style | |
| 268 low-pass filter. The default value of 3390 Hz is supposedly what is present in | |
| 269 at least some Genesis/Megadrive models. Other models reportedly use an even | |
| 270 lower value. | |
| 468 | 271 |
| 1014 | 272 Clocks |
| 273 ------ | |
| 274 | |
| 275 The clocks section contains settings that affect how fast things run. | |
| 276 | |
| 277 "m68k_divider" describes the relationsip between the master clock (which is | |
| 278 53693175 Hz for NTSC mode and 53203395 Hz for PAL mode). The default value of 7 | |
| 279 matches the real hardware. Set this to a lower number to overclock the 68000 | |
| 280 and set it to a higher number to underclock it. | |
| 281 | |
| 282 "max_cycles" controls how often the system is forced to synchronize all | |
| 283 hardware. BlastEm generally uses a sync on demand approach to synchronizing | |
| 284 components in the system. This can provide perfect synchronization for most | |
| 285 components, but since the Z80 can steal cycles from the 68000 at unpredictable | |
| 286 times 68000/Z80 synchronization is imperfect. The default value of 3420 | |
| 287 corresponds to the number of master clock cycles per line. Larger numbers may | |
| 288 produce a modest performance improvement whereas smaller numbers will improve | |
| 289 68000/Z80 synchronization. | |
| 290 | |
| 291 "speeds" controls the speed of the overall emulated console at different | |
| 292 presets. Preset 0 is the default speed and should normally be set to 100. The | |
| 293 other presets enable the slow/turbo mode functionality. | |
| 294 | |
| 295 UI | |
| 296 -- | |
| 297 | |
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298 The UI section contains settings that affect the user interface. |
| 1014 | 299 |
| 300 "rom" determines the path of the Genesis/Megadrive ROM that implements the UI. | |
| 301 Relative paths will be loaded relative to the BlastEm executable. | |
| 302 | |
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303 "initial_path" specifies the starting path for the ROM browser. It can contain |
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304 the following special variables: $HOME, $EXEDIR. Additionally, variables |
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305 defined in the OS environment can be used. |
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306 |
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307 "screenshot_path" specifies the directory "internal" screenshots will be saved |
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308 in. It accepts the same special variables as "initial_path". |
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309 |
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310 "screenshot_template" specifies a template for creating screenshot filenames. |
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311 It is specified as a format string for the C library function strftime |
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312 |
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313 "save_path" specifies the directory that savestates, SRAM and EEPROM data will |
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314 be saved in for a given game. It can contain the following special variables: |
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315 $HOME, $EXEDIR, $USERDATA, $ROMNAME. Like "initial_path" it can also reference |
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316 variables from the environment. |
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317 |
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318 Path Variables |
| 1014 | 319 -------------- |
| 320 | |
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321 This section explains the meaning of the special path variables referenced |
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322 in the previous section. |
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323 |
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324 $HOME The home directory of the current user. On most Unix variants, it |
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325 will be a subdirectory of /home. On Windows it will typically be a |
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326 subdirectory of C:\Users |
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327 $EXEDIR The directory the BlastEm executable is located in |
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328 $USERDATA This is an OS-specific path used for storing application specific |
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329 user data. On Unix variants, it will be $HOME/.local/share/blastem |
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330 On Windows it will be %LOCALDATA%/blastem |
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331 $ROMNAME The name of the currently loaded ROM file without the extension |
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332 |
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333 System |
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334 ------ |
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335 |
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336 "ram_init" determines how the RAM in the emulated system is initialized. The |
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337 default value of "zero" will cause all RAM to be zeroed out before the system |
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338 is started. Alternatively, "random" can be used to initialize RAM with values |
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339 from a pseudo-random number generator. This option is mostly useful for |
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340 developers that want to debug initialization issues in their code. |
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341 |
| 1014 | 342 "default_region" determines the console region that will be used when region |
| 343 detection fails and when there are multiple valid regions. The default of 'U' | |
| 344 specifies a 60Hz "foreign" console. | |
| 345 | |
| 468 | 346 Debugger |
| 347 -------- | |
| 348 | |
| 349 BlastEm has an integrated command-line debugger loosely based on GDB's | |
| 350 interface. The interface is very rough at the moment. Available commands in the | |
| 351 68K debugger are: | |
| 1066 | 352 b ADDRESS - Set a breakpoint at ADDRESS |
| 353 d BREAKPOINT - Delete a 68K breakpoint | |
| 354 co BREAKPOINT - Run a list of debugger commands each time | |
| 1014 | 355 BREAKPOINT is hit |
| 1066 | 356 a ADDRESS - Advance to address |
| 357 n - Advance to next instruction | |
| 358 o - Advance to next instruction ignoring branches to | |
| 359 lower addresses (good for breaking out of loops) | |
| 360 s - Advance to next instruction (follows bsr/jsr) | |
| 361 c - Continue | |
| 362 bt - Print a backtrace | |
| 363 p[/(x|X|d|c)] VALUE - Print a register or memory location | |
| 364 di[/(x|X|d|c)] VALUE - Print a register or memory location each time | |
| 365 a breakpoint is hit | |
| 366 vs - Print VDP sprite list | |
| 367 vr - Print VDP register info | |
| 368 zb ADDRESS - Set a Z80 breakpoint | |
| 369 zp[/(x|X|d|c)] VALUE - Display a Z80 value | |
| 370 q - Quit BlastEm | |
| 468 | 371 Available commands in the Z80 debugger are: |
| 1066 | 372 b ADDRESS - Set a breakpoint at ADDRESS |
| 373 de BREAKPOINT - Delete a Z80 breakpoint | |
| 374 a ADDRESS - Advance to address | |
| 375 n - Advance to next instruction | |
| 376 c - Continue | |
| 377 p[/(x|X|d|c)] VALUE - Print a register or memory location | |
| 378 di[/(x|X|d|c)] VALUE - Print a register or memory location each time | |
| 379 a breakpoint is hit | |
| 380 q - Quit BlastEm | |
| 468 | 381 |
| 382 The -d flag can be used to cause BlastEm to start in the debugger. | |
| 383 Alternatively, you can use the ui.enter_debugger action (mapped to the 'u' key | |
| 1014 | 384 by default) to enter the debugger while a game is running. To debug the menu |
| 385 ROM, use the -dm flag. | |
| 468 | 386 |
| 536 | 387 GDB Remote Debugging |
| 388 -------------------- | |
| 389 | |
| 390 In addition to the native debugger, BlastEm can also act as a GDB remote | |
| 391 debugging stub. To use this, you'll want to configure your Makefile to produce | |
| 392 both an ELF executable and a raw binary. Invoke an m68k-elf targeted gdb with | |
| 393 the ELF file. Once inside the gdb session, type: | |
| 394 | |
| 1066 | 395 target remote | BLASTEM_PATH/blastem ROM_FILE.bin -D |
| 536 | 396 |
| 397 where BLASTEM_PATH is the relative or absolute path to your BlastEm | |
| 398 installation and ROM_FILE.bin is the name of the raw binary for your program. | |
| 399 BlastEm will halt at the beginning of your program's entry point and return | |
| 400 control to GDB. This will allow you to set breakpoints before your code runs. | |
| 401 | |
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402 On Windows, the procedure is slightly different. First run |
| 1066 | 403 blastem.exe ROM_FILE.bin -D |
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404 This will cause BlastEm to wait for a socket connection on port 1234. It will |
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405 appear to be frozen until gdb connects to it. Now open the ELF file in gdb |
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406 and type: |
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407 |
| 1066 | 408 target remote :1234 |
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409 |
| 536 | 410 Trace points and watch points are not currently supported. |
| 411 | |
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412 Included Tools |
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413 -------------- |
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414 |
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415 BlastEm ships with a few small utilities that leverage portions of the emulator |
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416 code. |
| 1066 | 417 |
| 418 dis - 68K disassembler | |
| 419 zdis - Z80 disassembler | |
| 420 vgmplay - Very basic VGM player | |
| 421 stateview - GST save state viewer | |
| 422 | |
| 1013 | 423 VSync |
| 424 ----- | |
| 425 | |
| 1014 | 426 This section includes information about using VSync with BlastEm. As mentioned |
| 427 above, the code is currently designed to only sync to audio and has some issues | |
| 428 with VSync as a result. That said, if your computer is fast enough and you | |
| 429 don't care about turbo mode, it can generally made to work. | |
| 430 | |
| 431 The native refresh rate of an NTSC Genesis is approximately 59.92 Hz which is | |
| 432 probably not the native refresh rate of your monitor. Fortunately, it is | |
| 433 most likely lower than your refresh rate. As long as this is true, VSync will | |
| 434 generally work as long as your computer is fast enough to cope with the time | |
| 435 lost waiting for VSync and the audio buffer is large enough to not run out of | |
| 436 samples during that delay. Latency will suffer a bit and you'll get a doubled | |
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437 frame every once and a while, but generally things will be fine. |
| 1014 | 438 |
| 439 If you enable VSync and you're getting audio dropouts, first try doubling the | |
| 440 audio buffer setting. If you still experience dropouts, it's possible your | |
| 441 computer is not fast enough or that your monitor's actual refresh rate is in | |
| 442 fact lower than that of the emualted console. Not much can be done about the | |
| 443 former (apart from disabling VSync), but the latter can be dealt with by | |
| 444 lowering the default speed slightly in the "clocks" section. | |
| 445 | |
| 446 A future release will support VSync in a less hacky fashion. | |
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447 |
| 1066 | 448 Special Thanks |
| 449 -------------- | |
| 450 | |
| 451 My work has been made much easier by the contributions of those in the Genesis | |
| 452 community past and present. I'd like to thank the people below for their help. | |
| 453 | |
| 454 Nemesis - His work reverse engineering and documenting the VDP and | |
| 455 YM-2612 has saved me an immeasurable amount of time. I've | |
| 456 found both his sprite overflow test ROM and VDP FIFO | |
| 457 Testing ROM to be quite helpful. | |
| 458 | |
| 459 Charles MacDonald - While it hasn't been updated in a while, I still find his | |
| 460 VDP document to be my favorite reference. His Genesis | |
| 461 hardware document has also come in handy. | |
| 462 | |
| 463 Eke-Eke - Eke-Eke wrote a great document on the use of I2C EEPROM in | |
| 464 Genesis games and also left some useful very helpful | |
| 465 comments about problematic games in Genesis Plus GX | |
| 466 | |
| 467 Bart Trzynadlowski - His documents on the Genecyst save-state format and the | |
| 468 mapper used in Super Street Fighter 2 were definitely | |
| 469 appreciated. | |
| 470 | |
| 471 KanedaFR - Kaneda's SpritesMind forum is a great resource for the | |
| 472 Sega development community. | |
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473 |
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474 Titan - Titan has created what are without a doubt the most |
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475 impressive demos on the Megadrive. Additionally, I am very |
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476 grateful for the documentation provided by Kabuto and the |
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477 assistance of Kabuto, Sik and Jorge in getting Overdrive 2 |
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478 to run properly in BlastEm. |
| 1066 | 479 |
| 480 I'd also like to thank the following people who have performed compatibility | |
| 481 testing or submitted helpful bug reports | |
| 482 | |
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483 micky, Sasha, lol-frank, Sik, Tim Lawrence, ComradeOj, Vladikcomper |
| 1066 | 484 |
| 468 | 485 License |
| 486 ------- | |
| 487 | |
| 488 BlastEm is free software distributed under the terms of the GNU General Public | |
| 489 License version 3 or higher. This gives you the right to redistribute and/or | |
| 490 modify the program as long as you follow the terms of the license. See the file | |
| 491 COPYING for full license details. | |
| 492 | |
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493 Binary releases of BlastEm are packaged with GLEW and SDL2 which have thier own |
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494 licenses. See GLEW-LICENSE and SDL-LICENSE for details. |