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Category: vendor-specific BIOS extensions

INT 15 - Tandy??? - ???

	AH = E4h
	AL = subfunction
	    21h, 89h, 8Ah, 8Bh called by 386MAX v6.01
	DL = ???
Return: DL = 00h if successful???
Note:	the section of code in 386MAX which calls these functions also checks
	  whether the ROM BIOS has both Tandy and Phoenix Technologies
	  signatures if these calls fail; the Tandy 1000SL/TL BIOS does not
	  support this function, however, returning the usual CF set/AH=86h for
	  "unsupported function".

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