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.Dd July 26, 2014

.Dt DGEN 1

.Os

.Sh NAME

.Nm dgen

.Nd Sega Genesis/Mega Drive emulator

.Sh SYNOPSIS

.Nm dgen

.Op Fl Pfhmv

.Op Fl R Ar (J|U|E)

.Op Fl H Ar HZ

.Op Fl D Ar DEMONAME

.Op Fl d Ar DEMONAME

.Op Fl n Ar USEC

.Op Fl p Ar CODE,CODE...

.Op Fl r Ar RCFILE

.Op Fl X Ar XFACT

.Op Fl Y Ar YFACT

.Op Fl S Ar FACT

.Op Fl g Ar (0|1)

.Op Fl G Ar XxY

.Op Fl s Ar SLOT

.Ar [romname [...]]

.Sh DESCRIPTION

The ROM image in the file

.Ar romname

is executed, as emulated on a Sega Genesis or Mega Drive running in 60Hz NTSC

mode (unless the

.Fl P

option is specified, in which case 50Hz PAL mode is used).

.Ar romname

should be in raw binary or SMD format, and may be compressed with

.Xr gzip 1 ,

.Xr zip 1 , or

.Xr bzip2 1 .

.Pp

When

.Ar romname

isn't specified, DGen starts without a ROM. It can be loaded later from the

prompt. When more than a single

.Ar romname

is specified, they are executed sequentially.

.Pp

The options are as follows:

.Bl -tag -width Fl

.It Fl H Ar HZ

Use a custom frame rate, can be used to accelerate or slow down emulation.

.It Fl P

Emulate 50Hz PAL mode (as used in European models of the Mega Drive).

.It Fl R Ar (J|U|E)

Emulator region. Without this option, DGen uses the first region mentioned in

the ROM header. It should be combined with

.Fl P

for PAL mode. See below.

.Bl -tag -width Fl

.It (none)

Autodetect (NTSC, 60Hz)

.It Fl P

Autodetect (PAL, 50Hz)

.It Fl R Ar J

Japan (NTSC, 60Hz)

.It Fl R Ar J Fl P

Japan (PAL, 50Hz)

.It Fl R Ar E

Europe (NTSC, 60Hz, music will certainly play too fast)

.It Fl R Ar E Fl P

Europe (PAL, 50Hz)

.It Fl R Ar U

America (NTSC, 60Hz)

.It Fl R Ar U Fl P

Same as

.Fl R Ar E Fl P

.El

.It Fl f

Run fullscreen, if possible.

.It Fl h

Show a brief synopsis of all options.

.It Fl m

MinGW only. This option prevents DGen from detaching from its control console.

.It Fl v

Show the version number, and exit.

.It Fl D Ar DEMONAME

Play back a demo recorded with the

.Fl d

option.

.It Fl d Ar DEMONAME

Record a demo of the program running, which can be later replayed with the

.Fl D

switch.

.It Fl n Ar USEC

Sleep for a number of microseconds after every frame, to give time to other

processes.

.It Fl p Ar CODE,CODE...

Modify the ROM image in memory, using Game Genie or Hex style codes. Game

Genie codes are of the form

.Ar ABCD-EFGH

and Hex codes are in the form

.Ar 123456:ABCD .

To specify more than one code, separate them with commas (do

.Ar not

use spaces).

.It Fl r Ar RCFILE

Parse another rc file after $HOME/.dgen/dgenrc. Values in the specified file

override those in the preceding files.

.It Fl X Ar XFACT

Scale the window XFACT times in the X direction. XFACT must be a positive

integer.

.It Fl Y Ar YFACT

Scale the window YFACT times in the Y direction. YFACT must be a positive

integer.

.It Fl S Ar FACT

Scale the window FACT times in both directions. FACT must be a positive integer.

.It Fl g Ar (0|1)

Enable/disable OpenGL (if compiled-in).

.It Fl G Ar XxY

Desired window size (e.g. 640x480, 800x600, etc.)

.It Fl s Ar SLOT

Load the saved state from the given slot at startup (0-9)

.El

.Sh INTERACTIVE PROMPT

A minimalist interactive prompt inspired from

.Xr vi 1

can be used to perform various operations described below. It is triggered by

pressing colon (:), the default key. Command-line editing, history and

completion are supported.

.Ss Commands

.Bl -tag -width xxxx

.It {quit, exit, q}

Quit, or load the next

.Ar romname

from command-line, if any.

.It {load, open, plug, o} Ar filename

Load a given ROM

.Ar filename .

.It {unload, close, unplug}

Unload the current ROM.

.It config_load Ar filename

Load configuration from file

.Ar filename .

.It config_save Ar filename

Save current configuration to file

.Ar filename .

.It reset

Genesis reset.

.It {ctv_push, ctv_pop, ctv_none}

Manage the stack of Crap TV filters (if compiled-in).

.It calibrate Ar number

Interactive calibration of the specified gamepad (1 or 2). If

.Ar number

isn't specified, default to 1.

.It unbind Ar binding [...]

Remove specified bindings (variables prefixed with "bind_").

See

.Xr dgenrc 5

for more information about them.

.It vgmdump start Ar filename

.It vgmdump stop

Manages VGM dumping/logging. If the second argument is

.Ar start

VGM dumping will be started at the path specified by the third argument.

If the second argument is

.Ar stop

VGM dumping will be stopped and the dump finalized.

.El

.Ss Variables

All configuration variables from

.Xr dgenrc 5

can be displayed and modified interactively, with immediate effect.

.Bl -tag -width xxxx

.It {int_name, bool_name, key_name, joy_name, ...} {value}

Affect

.Ar value

to variable

.Ar name .

.It {int_name, bool_name, key_name, joy_name, ...}

Display current value for variable

.Ar name .

.El

.Sh FILES

.Bl -tag -width $HOME/.dgen/dgen/saves/* -compact

.It Pa $HOME/.dgen/dgenrc

Contains user settings for the emulator.

.It Pa $HOME/.dgen/dgenrc.auto

Generated file containing saved user settings.

.It Pa $HOME/.dgen/saves/*

Save states generated by the emulator.

.It Pa $HOME/.dgen/ram/*

Battery-backup RAM images, generated by the emulator for ROMs with save RAM.

.It Pa $HOME/.dgen/screenshots/*

Screenshots are generated there.

.It Pa $HOME/.dgen/roms/*

ROMs default search path.

.It Pa $HOME/.dgen/demos/*

Demos default search path.

.El

.Sh SEE ALSO

.Xr gzip 1 ,

.Xr bzip2 1 ,

.Xr zip 1 ,

.Xr dgenrc 5

.Sh AUTHORS

This manual page was written by

.An Joe Groff Aq joe@pknet.com .

.An Updated by zamaz Aq zamaz@users.sourceforge.net .

.Sh BUGS

There are known emulation bugs, see BUGS in DGen source package.

.Pp

.An Report bugs to Aq http://sourceforge.net/projects/dgen/ .