Format of Kingswood TSR modules:
Offset	Size	Description	)
 00h  4 BYTEs	signature "FTSR"
 04h	WORD	segment address of this module (used to check validity)
 06h	WORD	number of words to skip (usually 0000h if no PSP present)
 08h  N WORDs	module-defined data that must be at a fixed segment offset
		(usually only a PSP if file access is required)
     5N BYTEs	interrupt list (see #02744)
	BYTE	FFh terminator