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List:       freebsd-hackers
Subject:    Re: scd and mcd
From:       Warner Losh <imp () bsdimp ! com>
Date:       2011-04-23 23:37:57
Message-ID: A3D64DC0-58C3-451B-B85F-0072BB0697F2 () bsdimp ! com
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On Apr 23, 2011, at 5:19 PM, perryh@pluto.rain.com wrote:

> Warner Losh <imp@bsdimp.com> wrote:
> 
> > mcd and scd are ISA-only devices ... They were important for the
> > 386 (now not supported) and 486 machines.  Since the 486 machines
> > in question maxed out at 32MB, and 8.x has trouble running in 32MB
> > on x86, I'm guessing there aren't too many 486 SX/DX machines
> > running 8.x.
> 
> 486 were the last for which ISA was the primary bus, but ISA was
> still present (bridged from PCI) on most Pentium systems and common
> at least as recently as Pentium-II.  (I don't have a disassembled
> P-III handy to check whether it has an ISA slot.)

Most Pentium II and newer systems had IDE connectors on the motherboard.  Many of the \
Pentium I ones did too.  Only if you didn't have IDE connectors on mobo would you be \
likely to consider one of these CD's.  Also, I think they topped out at 4x or 8x \
speed since they had a custom interface.

Warner

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