Article View: comp.sys.mac
Article #14426Re: Experience with fast screen refresh routines
From: radford
Date: Wed, 11 Feb 1987 17:40
Date: Wed, 11 Feb 1987 17:40
20 lines
1447 bytes
1447 bytes
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
Technical Details
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<799@vaxb.calgary.UUCP>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!water!watnot!watmath!clyde!rutgers!mit-eddie!genrad!decvax!tektronix!uw-beaver!ubc-vision!alberta!calgary!radfordReferences:
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watnot!watmath!clyde!rutgers!mit-eddie!genrad!decvax!tektronix!uw-beaver!ubc-vision!alberta!calgary!radford 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.