Path: utzoo!attcan!telly!lethe!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!caen!uflorida!mailer.cc.fsu.edu!sun13!ds1.scri.fsu.edu!curci From: curci@ds1.scri.fsu.edu (Raymond Curci) Newsgroups: comp.sys.ibm.pc.misc Subject: Re: Reading the Real Time Clock (8254) on the PC. Message-ID: <1716@sun13.scri.fsu.edu> Date: 15 Dec 90 03:21:57 GMT References: Sender: news@sun13.scri.fsu.edu Distribution: comp Organization: SCRI, Florida State University Lines: 27 In article benny@vlss.amdahl.com (Benny Schnaider) writes: >Hi, >I have problems in reading the internal registers of Real Time Clock of the >PC. It seems like I am stack after the read. >Any suggestions (Code) > >Thanks, >Benny >----------------------------------------------------------------- The Intel 8254 is a timer chip used for RAM refresh, speaker output, and MS-DOS time-of-day TICK counting. Documentation on this chip is available from INTEL in their MICROPROCESSOR AND PERHPHERIAL HANDBOOK, VOLUME 1. The real time clock found on the IBM AT and its successors is actually a combinatiion real time clock/calendar/non-volitile RAM chip made by Motorola -- I don't have the part number handy. The registers are documented in IBM's manual, IBM AT TECHNICAL REFERENCE HARDWARE MANUAL. Ray Curci -- Raymond Curci INTERNET: curci@mailer.scri.fsu.edu Systems Engineer UUCP: ...!uunet!mailer.scri.fsu.edu!curci Institute of Molecular Biophysics SPAN: 46453::curci -or- SCRI1::curci Florida State University BITNET: curci@fsu.bitnet