Format of returned data structure for ANARKEY v3+:
Offset	Size	Description	)
 -1	BYTE	multiplex number
 00h	WORD	??? (I see 0001h in v3.0-4.0)
 02h	WORD	??? (I see 0001h in v3.0-4.0)
 04h	BYTE	??? (I see 0 in v3.0-4.0)
 05h	WORD	PSP segment of next program loaded