Toolkit for DOOM/DOOMTOOL.ISO/news/1400/1407

Internet Message Format | 1994-08-09 | 4KB

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From: [e-mail] (David Hawks)
Newsgroups: alt.games.doom
Subject: Re: doom kills barney ....
Date: 9 Aug 1994 13:39:19 -0400
Organization: University of North Carolina @ Wilmington
Lines: 64
Message-ID: <328f07$[e-mail]>
References: <323m2i$[e-mail]> <322v2u$[e-mail]> <[e-mail]>
NNTP-Posting-Host: sol.cms.uncwil.edu

[e-mail] (Peter Bell) writes:

>In article <322v2u$[e-mail]> [e-mail] (Dave Fearn) writes:
>>From: [e-mail] (Dave Fearn)
>>Subject: Re: doom kills barney ....
>>Date: 7 Aug 1994 15:37:02 -0000

>>[e-mail] (FKA) writes:

>>>Also regarding VLB and running doom or other software at speeds above 33MHz,
>>>the VLB has had a lot of problems. Basically if you own anything
>>>faster than a 33MHz VLB machine you will constantly have to deal with all
>>>sorts of compatibility probs. A friend of mine has been tring to run

Is this like, if I have a Metro or some 3 cylinder car, I will have trouble
driving my car at a constant 120 mph?   Oh BTW is my lack of 'constant
problems' with a 486 machine running the VLB at 40MHz an anomaly(sp?)?

>>>Windows NT on his 66MHz VLB and has not been able to get it to work at all
>>>unless he switches the computer to 33MHz (which makes NT come to a crawl).
>VLB is specced as a 33Mhz syncronous bus.  Some manufacturers bend the specs to
>run it (sync) at 40Mhz, this is probably unwise.  Most companies just run the
>bus async on higher speed machines, although this was not a part of the
>original design idea.  If your friend is having problems running NT, but it

Hmmm... I was almost getting ready to put my foot in my mouth, but apparantly
I don't have enough information.  The VLB is spec'ed at 25-40MHz async, so
what is the deal with sync?   Is the VLB limited to 33MHz sync and 40MHz
async?  I do know if you have a decently well built machine/motherboard
it should have no problem running at 40MHz.

>>>VLB is essentially a dead technology for new computers. However,
>>>the newer PCI bus system is a bus that CAN support high speed proccessors
>>>and will likely become the new standard for pentium and top end proccessors.
>>>As far as I know, you will have no problem running doom on even a 100MHz
>>>pentium PCI bus (besides the fact that you the game will run way too fast to
>>>control).

>There is no such thing as a '100Mhz PCI bus'.  PCI is an async. bus system; it
>runs at 33MHz, irrespective of processor speed.  This is also why PCI is
>slower than VLB for machines with a 33MHz bus speed. (486/33s, 486DX2/33s,
>DX4s).  The PCI controller may need to idle a bus clock cycle to get in sync,
>VLB is clocked with the main CPU clock, and is always in sync.

True as far as I know.

>>I don't think that a 100MHz pentium would "run way to fast to control."
>>It would just produce more fluid operation operating at higher FPS.

>Since DOOM automatically compensates for processor speed, you should get the
>same play speed.  Practically, I can't see _any_ difference between the play
>on a 486/DX4 and a 90Mhz pentium.  I suspect that both have update rates that
>are considerably faster than our eyes can follow.  Never bothered to benchmark
>it though.

>Pete Bell
>----
>[e-mail]

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