Fwd: Re: scd and mcd

Andrew Lankford lankfordandrew at charter.net
Sun Apr 24 00:30:59 UTC 2011

My last desktop machine had an ASUS Pentium-3 (no ISA slots), USB1 
only.  It has outlived the original hard drive, CDROM, and power supply, 
but I think it makes more sense these days to throw these systems out 
rather than "future-proof" them, especially if a fanless SoC could be 
less power-hungry and noisy.   It seems to me that people who want to 
get more life out 10yr old hardware need to be part of some sort of 
trimmed down "LegacyBSD" project that caters to their special needs.  
You all know more than I do about the orgs that are following the 
stable-6 or stable-7 branches, but are they using  ancient CDROMS with a 
limited life span?

-------- Original Message --------
From: 	- Sat Apr 23 19:53:48 2011
X-Account-Key: 	account2
X-UIDL: 	<A3D64DC0-58C3-451B-B85F-0072BB0697F2 at bsdimp.com>
X-Mozilla-Status: 	0011
X-Mozilla-Status2: 	00000000
Return-Path: 	<imp at bsdimp.com>
Received: 	from imp04 ([]) by mta52.charter.net (InterMail 
vM. 201-2219-117-106-20090629) with ESMTP id 
<20110423234226.QAAM13475.mta52.charter.net at imp04> for 
<lankfordandrew at charter.net>; Sat, 23 Apr 2011 19:42:26 -0400
Received: 	from harmony.bsdimp.com ([]) by imp04 with 
charter.net id bBiR1g01x1qqkgf04BiSRj; Sat, 23 Apr 2011 19:42:26 -0400
X-Chzlrs: 	??
X-Authority-Analysis: 	v=1.1 
cv=ACdvlZsxPtp6/8rt9ATxQxe5eelQ5vQqaf1LwcbVAy0= c=1 sm=1 
a=Ucbx8mQ_rlYA:10 a=MV1VDysopeJvYeH43xkbGw==:17 a=GKysJfYJAAAA:8 
a=7Qk2ozbKAAAA:8 a=VHkpZ49OhpeKkUvcBWkA:9 a=ABrYPtnIPbQqMp5bbigA:7 
a=CjuIK1q_8ugA:10 a=cvZW9r6VXHAA:10 a=aNaW_GFDrTlh0hGR9xgA:9 
a=P0Ne2a3NTbHX3BCDdCkA:7 a=MV1VDysopeJvYeH43xkbGw==:117
Received: 	from [] (63.imp.bsdimp.com []) 
(authenticated bits=0) by harmony.bsdimp.com (8.14.4/8.14.3) with ESMTP 
id p3NNbvwt006040 (version=TLSv1/SSLv3 cipher=DHE-DSS-AES128-SHA 
bits=128 verify=NO); Sat, 23 Apr 2011 17:37:59 -0600 (MDT) 
(envelope-from imp at bsdimp.com)
Subject: 	Re: scd and mcd
Mime-Version: 	1.0 (Apple Message framework v1084)
Content-Type: 	multipart/alternative; boundary=Apple-Mail-4-1024646444
From: 	Warner Losh <imp at bsdimp.com>
In-Reply-To: 	<4db35e8a.R5LDMfg8cygIRbfF%perryh at pluto.rain.com>
Date: 	Sat, 23 Apr 2011 17:37:57 -0600
Cc: 	hackers at FreeBSD.org, lankfordandrew at charter.net
Message-Id: 	<A3D64DC0-58C3-451B-B85F-0072BB0697F2 at bsdimp.com>
References: 	<4DB3142A.4000807 at charter.net> 
<1E3F5B85-5A1A-4118-A9D8-932F46619C79 at bsdimp.com> 
<4db35e8a.R5LDMfg8cygIRbfF%perryh at pluto.rain.com>
To: 	perryh at pluto.rain.com
X-Mailer: 	Apple Mail (2.1084)
X-Greylist: 	Sender succeeded SMTP AUTH, not delayed by 
milter-greylist-4.0.1 (harmony.bsdimp.com []); Sat, 23 Apr 2011 
17:37:59 -0600 (MDT)

On Apr 23, 2011, at 5:19 PM, perryh at pluto.rain.com wrote:

>  Warner Losh<imp at 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.


More information about the freebsd-hackers mailing list