🚀 go-pugleaf

In article <C0Jv8C.3t7@srgenprp.sr.hp.com> darrylo@sr.hp.com writes:
>Barry Sardis (bsardis@netcom.com) wrote:
>
>> timhu@ico.isc.com (Timothy Hu) writes:
>>
>> >Indeed, the only difference between the 1542A and the 1542B is the card
>> >length. Software-wise, the cards are identical. I verified this with the
>> >Adaptec people twice.
>>
>> That would seem kind of dumb, unless the A has been replaced by the B. I 
>> was under the impression the the B stood for Bus Master.
>
>     No, both the 1542A and 1542B are DMA bus-mastering cards.  I
>imagine that Adaptec came out with a "B" card because it was cheaper to
>produce (hence, more profits).  I've heard that a 1542C is in the works,
>but I haven't heard much about it.
>
>     The cards (1542A vs 1542B) are not 100% identical, though.  They're
>the same as far as MSDOS is concerned, but they're not 100% hardware
>compatible.  For example, an old version of BSD368 (a PC Unix) would not
>boot from a 1542A, due to some minor difference.

The old 1542's couldn't do scatter-gather, hardly a minor difference when
you're writing/reading to noncontiguous buffers in memory. 
-- 
Boycott AT&T for their absurd anti-BSDI lawsuit. | Drew Eckhardt
Condemn Colorado for Amendment Two.		 | drew@cs.colorado.edu
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