Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!julius.cs.uiuc.edu!rpi!uupsi!cci632!cpp
From: cpp@cci632.UUCP (Carl P. Petito)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: Stargoose
Summary: clock fix
Keywords: stargoose clock
Message-ID: <45412@cci632.UUCP>
Date: 27 Dec 90 18:21:22 GMT
References: <2297@dsac.dla.mil>
Organization: Computer Consoles Inc. an STC Company, Rochester, NY
Lines: 33

In article <2297@dsac.dla.mil>, nx00699@dsac.dla.mil (Gene McManus) writes:
> I just put up 'Stargoose', and as Bill noted in the distribution, this
> is an arcade-quality game. ...
> ... the clock speed
> is about 3 times faster than normal. 
> 
> Another question; what format is the documentation file?
> 
> Thanx...
> Gene

I disassembled enough of my BIOS to figure out how to reinit the clock
timer that gets changed by stargoose.  The following is the code; it works
for my XT class clone - your mileage my vary:

	cli
	mov al, 0x36
	out 0x43, al
	mov al, 0x00
	out 0x40, al
	out 0x40, al
	sti

The code puts timer 0 of the 8253 chip back into a divide by 0xffff; I
assume that stargoose needs a faster interrupt rate and hence the divisor
factor was changed for timer 0.

And yes, I know the code could be made more compact, etc; why bother?

And I also ask - what is the documentation format?


Carl Petito