Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!dogie.macc.wisc.edu!uwvax!puff!cat28!blochowi
From: blochowi@cat28.CS.WISC.EDU (Jason Blochowiak)
Newsgroups: comp.sys.apple
Subject: Re: TWGS ROM bugs
Message-ID: <2719@puff.cs.wisc.edu>
Date: 7 May 89 02:22:34 GMT
References: <890505222604.700890@DOCKMASTER.ARPA> <21499@srcsip.UUCP>
Sender: news@puff.cs.wisc.edu
Reply-To: blochowi@cat28.CS.WISC.EDU (Jason Blochowiak)
Organization: U of Wisconsin CS Dept
Lines: 38

In article <21499@srcsip.UUCP> shankar@bedrock.UUCP (Son of Knuth) writes:
>Several people have mentione a bug/s with the TWGS card ROMs.
>I was just wondering what the ROMs are used for?  
	The firmware is for toying with the TWgs. Included are calls to find
out what version of the TWgs it is, whether or not it can be set to different
speeds, get info about what speed(s) are available, routines to get & set the
speed, and to find out about and play around with the cache (the routine to
find the size of the cache - GetCacheSize - is buggy). There are also some
ID bytes to make sure the TWgs is there. The specific calls are as follows:
TransWarpID (4 bytes - not a routine, just 'TWGS'), and TransWarpID2 ('SMJS').
GetTWInfo,
ResetTW (overrides control panel settings),
GetMaxSpeed,
GetNumISpeed (# of speeds),
Freq2Index, Index2Freq (these switch back and forth between a speed index and
the actual Khz [not Mhz] speeds),
GetCurSpeed, SetCurSpeed (these get & set the clock speed in Khz),
GetCurISpeed, SetCurISpeed (these use the index numbers),
FlushCache,
DisableIRQLogic, EnableIRQLogic (I'll discuss these below),
GetTWConfig, SetTWConfig,
GetCacheSize (the buggy one), EnableDataCache,
EnableDataCache, DisableDataCache (apparently data & instruction caching are
seperable - instruction caching can't be turned off).

	About the IRQ stuff: The TransWarp can slow itself down when the IRQ
disable processor flag (Interrupt ReQuest) is set - so, if there's some timing
critical routine (like I guess are used in the AppleTalk stuff) which sets
the IRQ flag, it won't run at the wrong speed. I have this option disabled,
and I haven't had any problems (the TWgs comes with it enabled, so as to not
cause any problems), but I don't own/use AppleTalk.

>Subash Shankar             Honeywell Systems & Research Center

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		Jason Blochowiak (blochowi@garfield.cs.wisc.edu)
			"Not your average iconoclast..."
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