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DX20LD.DOC -- Changes from V4(4) to V4(5)
COPYRIGHT (C) 1978,1980,1982 BY
DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.
THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND 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. NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY
THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT
DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.
DX20LD.DOC Page 2
DX20LD.DOC -- Changes from V4(4) to V4(5)
The DX20 is a microcoded device that must have its microcode down-line
loaded. Any DX20's on a system are automatically loaded by BOOT
whenever TOPS-20 is manually loaded by the operator. Sometimes,
however, it is desirable to manually reload the DX20 microcode while
TOPS-20 is up and running. The DX20LD program is designed to perform
this manual reload of the DX20 microcode.
The DX20 comes in two basic types:
1. 1 for TU70-series tape drives (type DX20A).
2. 1 for RP20 disk drives (type DX20B).
(Note that the type, channel # and unit # of each DX20 are reported on
the CTY by BOOT when it reloads the DX20's during a manual restart of
TOPS-20. During an auto-restart of TOPS-20, only DX20B's are
Corresponding to these two types of DX20's are two types of microcode:
1. TU70-series microcode: in file DXMCA.ADX
2. RP20 microcode: in file DXMCE.ADX
2.0 EXTERNAL CHANGES
If your system has only one DX20 on it (or only one of each type of
DX20), then you need only specify the appropriate microcode file as
follows (assuming you have a TU70-series DX20):
If you have more than 1 of the same type DX20 (2 TU70-series DX20's,
say), then you must specify the channel number and the DX20 number of
the particular DX20 you want to reload:
The /D switch, shown in the above example is of the form /D:mn, where
"m" is the channel number (RH20 controller #) and "n" is the DX20
number of the DX20 that should be reloaded.
DX20LD.DOC Page 3
Ordinarily, the filename is sufficient to identify to DX20LD, the type
of DX20 (tape or disk) to be reloaded. Any filename of the form
"DXMCAxxxxxxxx.ADX" indicates microcode for a TU70-series DX20 while
any filename of the form "DXMCExxxxxxxx.ADX" indicates microcode for
an RP20 DX20. If, for some reason, it is necessary to load microcode
from a file whose name does not follow these conventions, then /T (for
TU70-series tape drives) or /R (for RP20 disk drives) may be
specified. (Be careful, as it is possible to force DX20LD to load the
wrong type of microcode for a given DX20.)
DXMCA.ADX TU70-series DX20's (DX20A)
DXMCE.ADX RP20 DX20's (DX20B)
/D:mn Load microcode for channel "m", DX20 "n"
/T Load microcode only for TU70-series DX20's
/r Load microcode only for RP20 DX20's
When to reload the DX20:
1. When the DX20 microcode stops - giving BUGCHK's DXBDMI or
DXBDIE, or BUGINF DX2HLT.
2. Power-fail restart caused by line interference or power
3. Someone has manually powered-down the DX20.
4. Auto-reload of operating system (necessary to reload only
DX20A's - BOOT will automatically reload DX20B's).
When not to reload the DX20:
Never make a pratice of reloading a DX20 while it is currently
performing IO transfers - there is a posibility of writing random
data to a tape or disk. In the latter case you could cause
damage to the disk structure.
DX20LD.DOC Page 4
3.0 KNOWN BUGS AND DEFICIENCIES
4.0 INSTALLATION INSTRUCTIONS
4.1 Files Needed to Run DX20LD
4.2 Instructions for Loading and Installing DX20LD
Mount the tape labeled Installation Tape on MTA0: and type the
SKIP MTA0:5 FILES
RESTORE <*>DX20LD.EXE (TO) SYS:*.*.-1
4.3 Files Needed to Build DX20LD
DX20LD is built from the following file:
In addition, the following files must be on SYS:
DX20LD.DOC Page 5
4.4 Instructions for Building DX20LD
Mount the tape labeled Distribution on MTA0: and type the following
RESTORE <*>*.*.* (TO) <self>*.*.*
4.5 Special Considerations
The file which contains the DX20 microcode and is loaded by DX20LD is
SYS:DXMCA.ADX for non-RP20 sites. For the RP20 sites it is
5.0 INTERNAL CHANGES
Refer to DX20LD.TCO for detailed information about internal changes.
[End of DX20LD.DOC]