Article View: comp.os.msdos.programmer
Article #2962Re: changing cpu speed through software
From: Robert Collins
Date: Thu, 08 Nov 1990 16:10
Date: Thu, 08 Nov 1990 16:10
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1471 bytes
In article <9802@helios.TAMU.EDU> briggs@tamunix (Mark Lowe) writes: >I messed around with the system enough to figure out that an unused bit in >I/O port 60 or 61 controlled the speed. Make sure you disable interrupts >before toggling the bit, though, or you'll hang the machine. > >I hope this vague description gives you some clues. > By no means is CPU speed change consistent among machines. Some use an I/O port. Some use the keyboard controller, some use memory mapped I/O. And you can almost guarantee, that writing to I/O port 61 in this guy's machine won't do it (unless it is the same motherboard as the abovementioned). The bottom line? CPU Speed change is hardware/motherboard dependant. -- "Worship the Lord your God, and serve him only." Mat. 4:10 Robert Collins UUCP: ...!sun!altos86!rcollins HOME: (408) 225-8002 WORK: (408) 432-6200 x4356
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!att!linac!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!apple!altos!altos86!rcollinsReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!att!linac!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!apple!altos!altos86!rcollins From: rcollins@altos86.Altos.COM (Robert Collins) Newsgroups: comp.os.msdos.programmer Subject: Re: changing cpu speed through software Keywords: cpu speed Message-ID: <4363@altos86.Altos.COM> Date: 8 Nov 90 16:10:42 GMT References: <1990Nov3.014940.9232@rice.edu> <9802@helios.TAMU.EDU> Reply-To: rcollins@altos86.UUCP (Robert Collins) Organization: Altos Computer Systems, San Jose, CA Lines: 22