.brd board database file–typically the printed circuit board (pcb)
design file that you add symbols and a netlist to when designing the board.
.dra drawing file–graphics that can be graphically edited and used to create the binary symbols that are used in the .brd file.
.mdd module definitions–sections of a board design that include package symbols and logical connections.
.psm package symbol, footprint.
.bsm mechanical symbol (board symbol) that gets added to a board with no logic attached.
.osm format symbol, (other symbol)–typically graphics, notes,drawing format, notes, logo’s.
.ssm shape symbol–when a pad is an irregular shape (not a circle, square, rectangle, and so on).
.fsm flash symbol–used to define a thermal relief pad. there is
an editor that helps you automatically create these.
.pad a padstack.
.scr script or macro file–an ascii text file containing allegro commands that can be replayed to reproduce the same results as if you were selecting those commands.
.tech technology file–ascii file of constraints and design rules.
.mcm multi-chip module file (apd) a design file similar to an
allegro.brd file, but different technology
.txt text file, such as that used for parameters. device files are .txt that contain the definition of a logical device including device type, package symbol, pincount, functions, and swappability.
.jrl a journal file contains a record of events—menu picks,keyboard, and so on—which are recorded for each session in allegro. you can share this data with customer support..art artwork files—manufacturing output sent to a vendor to
produce the images used to produce a printed circuit board.
.tag keeps track of the last board worked on in your current directory.without it, allegro will open up a new board file.
.ini this file keeps track of the path your working file is in. the.ini file also keeps track of the window location, the toolbar,
and the status of whether the control panel is docked and it's location. do not edit this file, if you are having problems with allegro. this file can be deleted as a form of troubleshooting. the file will be recreated automatically.
.geo this file remembers the location of forms the last time they were used and places the same type of form in the same location the next time it is used. do not edit this file!
.color color view—defines which subclass graphics will be visible or invisible.this file is automatically created when an artwork film control is defined or can be user defined.
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