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! d i g i t a l !   I N T E R O F F I C E  M E M O R A N D U M
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				       Date: 19-February-82
				       From: TSG/NCSS
				       Loc:  MR1-2/H22
				       Ext:  HOTLINE  5911
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Subj:	Notes on RSX20F and Lineprinters
.subtitle Subj:	Notes on RSX20F and Lineprinters
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RSX20F VE14-17 for TOPS10 had a problem with ERROR.SYS filling up
with "DEMAND TIMEOUT, GO ERRORS" for a line printer.  This had
the effect of bringing the TOPS10 to its knees trying to log
thousands of error messages.  What had happenned was that after
a "DEMAND TIMEOUT, GO ERROR" was detected, RSX20F would keep
retrying in the hopes that the error would go away.  Each retry
generated a new error message and RSX20F would send it to TOPS10
to be logged for SYSERR.  This is fixed by PCO 10-RSX20F-11 in
SIRUS for version 14-17.  The new RSX20F already has this fixed.
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A RSX20F lineprinter is NOT supported on a 1090, however, it does
work.  It is supported on 1091,2040,2050,2060.  The only difference
between a 1090 and 1091 for RSX20F is whether the DECtape driver
or the RX01 floppy disk driver is assembled into the EXEC.
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RSX20F can have up to two LP20 line printer controllers (LPT0:,LPT1:)
each talking to one of the following:
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.le;LP05 - 300 lines per minute printer
.le;LP07 - 900/1200 lines per minute printer (Charaband LPT)
.le;LP14 - 900 lines per minute printer
.le;LP26 - 600/450 lines per minute printer
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Note that RSX20F does not have a device driver for the LP11
lineprinter controller.