Hi, I would call X=TEST either HIGHSCAN or SAFESCAN if you were to ask me what syntax should be used to "exclude all high areas which contain other than all-0 / all-ff". By the way, while googling for NoMovExBDA I found that in EMM386 of DOS 6.22 / newer ROM= got improved. If that means that older versions did not use ROM= at all, it would be yet another reason why EMM386 of FreeDOS does not need ROM= at least in FreeDOS 1.0 (most newer boards / BIOSes copy ROM to shadow RAM anyway and need no help from EMM386 - even an old 386 board in my family needed no EMM386 help to shadow ROM).
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