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Xref: sserve comp.sys.ibm.pc.hardware:33795 comp.unix.bsd:6769 Newsgroups: comp.sys.ibm.pc.hardware,comp.unix.bsd Path: sserve!manuel.anu.edu.au!munnari.oz.au!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!spool.mu.edu!umn.edu!math.fu-berlin.de!informatik.tu-muenchen.de!roell From: roell@informatik.tu-muenchen.de (Thomas Roell) Subject: Re: Question on Diamond Clock Synthesizer In-Reply-To: curtis@cs.berkeley.edu's message of 11 Oct 1992 00:49:20 GMT References: <1b7tmgINNi06@agate.berkeley.edu> Sender: news@Informatik.TU-Muenchen.DE (USENET Newssystem) Organization: Inst. fuer Informatik, Technische Univ. Muenchen, Germany Date: Mon, 19 Oct 1992 08:24:20 GMT Message-ID: <1992Oct19.082420.16353@Informatik.TU-Muenchen.DE> Lines: 30 >(1) Can Diamond's "programmable" clock synthesizers generate >_any_ frequency? Could they thus be used to drive a fixed-scan >monitor? Yes, you can programm almost ANY frequency with that chip. There are a few limitations like the highest frequency the chip can produce (without emitting that neat smoke) and the resolution of the programming algorithm itself. >(2) Has anyone considered trying to reverse-engineer Diamond drivers >to discover the interface to the clock synthesizer? It doesn't >seem like it'd be that hard. That won't help you that much. In the BIOS you'll find a list of values you can programm the PLL to which was considered useful by the BIOS writer (i.e. all frequencies you use for the BIOS modes). But it won't give you the information HOW to programm other frequencies. The next thing (and I belive that was Diamonds major reason not to pass the things away) is that there are more revisions of boards with more different PLLs than you moght believe. Should I really tell you that they all use the same basic chips, but have to be programmed a little bit different to get the desired results ? So what would happen if you programm the PLL wrong and blow your board ? Who is liable for this ? - Thomas -- ------------------------------------------------------------------------------- Das Reh springt hoch, e-mail: roell@sgcs.com das Reh springt weit, #include <sys/pizza.h> was soll es tun, es hat ja Zeit ...