Format of PGS1600.DEV configuration information:
Offset	Size	Description	)
 00h	WORD	version (high byte = major, low byte = minor)
 02h	WORD	board initialisation mode
 04h	WORD	board I/O address
		03D0h CGA emulation
		03B0h MDA emulation
		0390h no emulation
		0350h no emulation, alternate
 06h	WORD	emulation buffer segment
		B800h	CGA emulation
		B000h	MDA emulation
		0000h	no emulation
 08h	WORD	PG1600 graphics buffer segment
 0Ah	WORD	number of bytes between consecutive graphic rows
 0Ch	WORD	horizontal pixel size
 0Eh	WORD	vertical pixel size
 10h	WORD	horizontal dots per inch
 12h	WORD	vertical dots per inch
 14h	WORD	graphics buffer bits per pixel
 16h	WORD	monitor bits per pixel