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From: radford@calgary.UUCP
Newsgroups: comp.sys.mac
Subject: Re: Experience with fast screen refresh routines
Message-ID: <799@vaxb.calgary.UUCP>
Date: Wed, 11-Feb-87 12:40:09 EST
Article-I.D.: vaxb.799
Posted: Wed Feb 11 12:40:09 1987
Date-Received: Sat, 14-Feb-87 12:42:03 EST
References: <3076@osu-eddie.UUCP>
Organization: U. of Calgary, Calgary, Ab.
Lines: 20
Summary: I think Mac ROM is faster than Mac RAM.

In article <3076@osu-eddie.UUCP>, elwell@osu-eddie.UUCP (Clayton M. Elwell) writes:

> Sometimes you don't know what you've got until you try to improve on it...

> I thought it would be nice to have a terminal emulator that could keep up at
> 38.4K baud without handshaking.  So, I sat down with my 68000 databook...

> ... all my
> careful optimization only gained my about 15-20%, which is hardly worth it
> for the extra memory eaten up.

> 2. Never underestimate the power of the ROM.

I'm not sure, but as I understand it, the Mac ROMs have significantly
faster access times than the RAM, due to the RAM having to also handle
screen refresh. This means that whenever you re-write ROM code for
speed, you start with a significant penalty. This could explain a lot
about your experiences.

    Radford Neal