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.;3-MAY-77-GR
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.LM0;.RM70;.F;.J;.FLAG CAP;.SP1;.TS5
^^U.DOC\\ --<V131
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^OCTOBER 1977
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^COPYRIGHT (^C) 1976,1977
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^DIGITAL ^EQUIPMENT ^CORPORATION, ^MAYNARD, ^MASS.
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^THIS SOFTWARE IS FURNISHED UNDER A LICENSE FOR USE ONLY ON A
SINGLE COMPUTER SYSTEM AND MAY BE COPIED ONLY WITH THE INCLUSION
OF THE ABOVE COPYRIGHT NOTICE. ^THIS SOFTWARE, OR ANY OTHER
COPIES THEREOF, MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE
TO ANY OTHER PERSON EXCEPT FOR USE ON SUCH SYSTEM AND TO ONE WHO
AGREES TO THESE LICENSE TERMS. ^TITLE TO AND OWNERSHIP OF THE
SOFTWARE SHALL AT ALL TIMES REMAIN IN ^^DEC\\.
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^THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT
NOTICE AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ^DIGITAL
^EQUIPMENT ^CORPORATION.
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^^DEC\\ ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY ^^DEC\\.
.T <U131.DOC
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<U.DOC -- <V131
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^OCTOBER 1977
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1.0##<SUMMARY
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1.##^MICROCODE VERSION 131 IS THE FOURTH RELEASE OF THE <KL10 MICROCODE.  ^THE <KL10
MICROCODE IS DIFFERENT FOR <TOPS-10 AND <TOPS-20 SYSTEMS.  ^THE <TOPS-10
MICROCODE IS CALLED <U.RAM.
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2.##^THE <KL10 MICROCODE IS NOT DEPENDENT ON ANY MONITOR, BUT BECAUSE OF
HARDWARE DIFFERENCES BETWEEN THE VARIOUS -10 PROCESSORS, A MONITOR MUST BE
BUILT SPECIFICALLY FOR THE <KL10.  <KL10 MICROCODE VERSION 131 HAS BEEN
TESTED WITH THE 6.02^A AND 6.03 MONITORS.  ^THE <KL10 MICROCODE HAS NO <DATE75 DEPENDENCIES.
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^SEE <LCREV FOR INFORMATION REGARDING MICROCODE REQUIREMENTS FOR VARIOUS HARDWARE REVISIONS LEVELS.
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2.0##<KNOWN <DEFICIENCIES
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^THE FOLLOWING ARE KNOWN DEFICIENCIES IN MICROCODE 131:
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1.##^MICROCODE VERSION 131 HAS NOT BEEN TESTED ON PROCESSOR REVISION LEVELS LESS THAN 8.
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2.##^MICROCODE VERSION 131 WILL NOT WORK CORRECTLY ON PROCESSOR REVISION LEVELS LESS THAN 6.
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3.##^SOME <JRST<'S THAT SHOULD TRAP IN USER MODE DO NOT.  (<JRST 10, AND <JRST 12.)
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4.##<MAP SHOULD NOT BE LEGAL IN USER MODE.
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5.##<EDIT CAN NOT BE INTERRUPTED WHEN IT IS LOOPING.
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6.##^STARTING THE MICROCODE AT LOCATION 0 DOES NOT CLEAR <PC BITS 13-17.  ^THEREFORE,
WHEN A MACHINE IS POWERED DOWN AND UP AGAIN THE MICROCODE MUST BE VERIFIED
AFTER LOADING.  ^VERIFYING THE MICROCODE CLEARS THOSE <PC BITS.
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7.##<BLKO AND <BLKI DO NOT WORK IN AN INTERRUPT LOCATION.
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3.0##<FIXED <PROBLEMS
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^THE FOLLOWING PROBLEMS HAVE BEEN FIXED:
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1.##^PAGE RESTORING IS NOW HANDLED PROPERLY.
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2.##^ILLEGAL FLAGS IN COMPARE STRING INSTRUCTIONS NO LONGER CAUSE A SYSTEM
CRASH WITH A PARITY ERROR.
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3.##^THE <DTE NUMBER IS COMPUTED CORRECTLY NOW FOR MORE THAN ONE <DTE.
^MULTIPLE <DTE<'S ARE THEREFORE SUPPORTED FOR 1090 SYSTEMS.
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4.##^START AND CONTINUE FUNCTIONS CAN NO LONGER HANG THE PROCESSOR IF AN INTERRUPT REQUEST IS PENDING.
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4.0##<RELATED <DOCUMENTATION
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^THE MICROCODE IS IMPLICITLY DOCUMENTED IN THE ^SYSTEM ^REFERENCE ^MANUAL, IN THAT
IT IS AN IMPLIMENTATION OF A <PDP10.  ^THE ONLY OTHER DOCUMENTATION IS IN THE LISTING
AND PRINTS OF THE <KL10 PROCESSOR.
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5.0##<FUNCTION <OF <U.RAM
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<U.RAM IS THE MICROPROGRAM WHICH DIRECTS THE OPERATION OF THE <KL10
HARDWARE TO EMULATE THE BEHAVIOR OF A <PDP10 FOR A <TOPS-10 SYSTEM.
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[^END OF <U131.DOC]