CompuServe: in the IBM Programming Forum (GO IBMPRO), Library 5, as INTrrA.*
	and INTrrB.*
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Key to system abbreviations
(unless otherwise indicated, a function is available on all systems)
	PC	IBM PC
	XT	IBM PC XT
	PORT	IBM PC Portable (uses same BIOS as XT)
	Jr	IBM PCjr
	AT	IBM PC AT
	XT2	IBM PC XT 2
	XT286	IBM PC XT/286
	CONV	IBM Convertible
	PS	IBM PS/2, any model
	PS30	IBM PS/2 Model 30 and below
	PS50+	IBM PS/2 Models 50,60,70,80
	CDP	Compaq Deskpro
	CLTE	Compaq LTE
	CP386	Compaq Portable 386
	CSLT	Compaq SLT
	CSYS	Compaq Systempro
	CGA	Color Graphics Adapter
	EGA	Enhanced Graphics Adapter
	VGA	Video Graphics Array
	MCGA	Multi-Color Graphics Array
	TopView TopView/DESQview/TaskView/OmniView/other compatibles
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