MAC II ROM Upgrade

[Phil Ronzone]

In article <1558 at pt.cs.cmu.edu> ralphw at 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 ... :-)
-- 
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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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