Xref: utzoo comp.sys.mac:15512 comp.unix.aux:139
Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!oliveb!pyramid!voder!apple!phil
From: phil@Apple.COM (Phil Ronzone)
Newsgroups: comp.sys.mac,comp.unix.aux
Subject: Re: MAC II ROM Upgrade
Message-ID: <9190@apple.Apple.Com>
Date: 29 Apr 88 17:01:31 GMT
References: <1895@polyslo.UUCP> <8546@apple.Apple.Com> <4050@dasys1.UUCP> <1227@uokmax.UUCP> <8972@apple.Apple.Com> <1558@pt.cs.cmu.edu>
Reply-To: phil@apple.UUCP (Phil Ronzone)
Organization: Apple Computer A/UX Group
Lines: 22
Keywords: MAC II, ROM Upgrade, A/UX

In article <1558@pt.cs.cmu.edu> ralphw@IUS3.IUS.CS.CMU.EDU (Ralph Hyre) writes:
... (about the National Semiconductor 16MB RAM board for the Mac II NuBus) ...

>Neat!  So, has anyone tried porting the BSD ramdisk driver to A/UX?
>..... At least A/UX isn't crippled like SunOS in terms of addressable 
>memory (I hear from 3rd party memory vendors that you can physically address 
>64M in a Sun-3/160, but only 24M is supported by the OS.  Quite a shame.)

There is a RAM disk available now from National I believe. However, you can
also specify a very large amount of buffers for the buffer cache (NBUF=nnnn
using the A/UX kconfig command) and the A/UX kernel will take memory for the
buffer cache from slower NuBus memory boards before it allocates from the
faster SIMM memory banks. I have 16MB of buffer cache myself. Sometimes,
some commands, especially large file copies when moving directories, work
unbelievably fast!

Instead of a RAM disk, how about 80MB of buffer cache??? Sync might slow your
system down a bit though ... :-)
-- 
-------------------------------------------------------------------------------
Philip K. Ronzone, A/UX Systems Architect               APPLELINK: RONZONE1
Apple Computer, Mail Stop 27AJ, 10500 N. DeAnza Blvd.  Cupertino, CA  95014
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