Repeated Writes/Reads to TOS Logical Device

;;; test.s
;
;	test -- repeated writes/reads to TOS logical device
;
;	mac -p -o test.prg test.s		; buffer in ST RAM
;	mac -dFASTRAM -p -o testfr.prg test.s	; buffer in FAST RAM
;	mac -dDEVICE=0 -p -o testflp.prg test.s	; device != 2
;	mac -dOFFSET=1 -p -o test1.prg test.s	; non-aligned xfers
;
;	15Mar89	jwt	kludged together, beware the Ides
;	16Mar89	jwt	added non-aligned transfers
;	08Aug89	jwt	more flexibility in buffer alignment, local stack
;	10Aug89	jwt	show device driver version
;	20Aug89	jwt	add test for second bank of system RAM (no Malloc()!)
;	09Apr90	jwt	do GetBPB() to clear MediaChange on all units, not
;			just floppies (for use with standard TOS driver)
;