Path: utzoo!attcan!uunet!cbmvax!bpa!drexel!jeff
From: jeff@drexel.UUCP (Jeff White)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Increasing clock speed of IBM PC/AT
Summary: Still a way around it
Keywords: 6mhz 8mhz
Message-ID: <666@drexel.UUCP>
Date: 7 Aug 88 23:36:03 GMT
References: <24213@teknowledge-vaxc.ARPA> <3723@omepd>
Organization: Drexel University, Phila., Pa.
Lines: 16

> After IBM figured out that people were running their 6 MHz machines at 
> 8 MHz (remember, IBM was planning on coming out with its own 8 MHz AT
> eventually), it put code in the BIOS to check clock speed.  If the clock
> was faster than 6 MHz, it shut the machine down.


  From what I remember reading and hearing about about IBM changed the BIOS,
it was still possible to run the machine at a higher speed.  IBM's speed check
routine in the BIOS was only run at boot (or reset) time, so you just had to
make sure that the computer was running at the original speed at that time.
After boot up is complete, the machine could be shifted to the higher speed
without any major complications.

						Jeff White
						Drexel University - ECE Dept.
						rutgers!bpa!drexel!jeff