Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!sdd.hp.com!elroy.jpl.nasa.gov!decwrl!waikato.ac.nz!canterbury.ac.nz!otago.ac.nz!michael
Newsgroups: comp.sys.mac.hardware
Subject: Re: Mac LC info
Message-ID: <1991Jun26.194214.618@otago.ac.nz>
From: michael@otago.ac.nz
Date: 26 Jun 91 19:42:14 NZDT
References: <13375@uwm.edu> <1991Jun26.150217.614@otago.ac.nz>
Organization: University of Otago, Dunedin, New Zealand
Lines: 32

In article <1991Jun26.150217.614@otago.ac.nz>, stanger@otago.ac.nz (Nigel Stanger) writes:

> 32-bit processor. However, the external address and data busses
> (sp?) are only 16-bit, which means the CPU has to make two
> accesses to retrieve something from memory. In theory this makes
> the thing twice as slow as a machine with a full 32-bit bus, but
> it doesn't seem that way from experience.

Um, thats a 32-bit address bus at any rate. Otherwise it would only address 64K
which would be a bit mean :-). "Theory" doesn't really tell us that it should be
twice as slow as a full 32-bit bus machine - for a start that assumes 100% bus
utilisation and I don't think many CPUs manage that. That aside, the critical
point about the '020 is that it has a cache of 64 longwords which mean that
tight loops do *no* external bus accesses for instructions, making speed of
execution much less dependent on wait states and bus width.

>> 5.)  I've seen lots of cards to increase the number of colors available to
>> Mac II's.  What about increasing their resolution to 800x600?
> 
> With the VRAM, you have already increased the number of colours
> you can get. Increasing the resolution depends on the video card
> and/or the monitor. You would probably have to get another video
> card (and thus use up your slot).

Make that definitely. Another monitor and some suitable video card in the slot.

Michael(tm) Hamel, Computing Services Centre, University of Otago, New Zealand

THEAKSTONE (n.)                    
Ancient mad tramp who jabbers to himself and swears loudly and obscenely
on station platforms and traffic islands.