Borland Graphics Interface
The Borland Graphics Interface is a graphics library used by DOS programs, which includes the ability to use loadable drivers. These drivers have the file extension .BGI.
Most BGI files begin with a 4-byte signature:
"pk" 0x08 0x08. Note the similarity to CHR font files used by BGI.
Newer versions have an 8-byte signature:
"FBGD" 0x08 0x08 0x08 0x08.
Following the signature is some text that names the driver, and gives copyright information. It usually begins with "
BGI Device Driver" or "
SVGA 256 Colour BGI Device Driver".
The header format was no doubt deliberately designed to be friendly to file viewers similar to the MS-DOS
type command. The
0x08 bytes could be interpreted as backspace characters, which will hide the signature.
The first 160 bytes of the driver file are a header. This is followed by the driver code segment. Far calls will be made to this address with SI containing the function number to execute.
- ftp://ftp.musoftware.de/pub/uz/bgi/ contains documentation and source code for creating BGI drivers, along with several complete drivers.
- A message about the driver format
The standard BGI drivers supplied by Borland were distributed with many software packages. There are at least a few different versions of the drivers. The following filenames are known: ATT.BGI, CGA.BGI, EGAVGA.BGI, HERC.BGI, IBM8514.BGI, PC3270.BGI, VGA256.BGI.
- Examples of software containing the Borland drivers: , , , 
- Examples of third-party drivers: VESA.BGI, svga16.bgi, svga256.bgi
- egavga.bgi - A v3 driver with the "FBGD" signature