INT 61 - Atari Portfolio - FORMAT CREDIT CARD MEMORY                            
	AH = 07h
	AL = drive number (00h = A:,01h = B:)
Return: CF clear if successful
	CF set on error
	    AH = error code (see #00234 at INT 13/AH=01h)
Note:	do not use this function to format the internal disk (drive number 02h)
SeeAlso: AH=00h"Portfolio",AH=08h"Portfolio",AH=09h"Portfolio"