[Simh] MOP header specs?

[Johnny Billquist]

On 2018-02-21 04:13, Tim Stark wrote:
> Folks,
> 
> Does anyone know any documentation provides some information about MOP 
> header in SYS files?

MOP headers no. But if you are referring to the .SYS files DEC 
distributed for things like DEC servers, which booted over MOP, those 
SYS files look like "normal" task files in RSX. Task files linked with 
no task header, though.

Example:
.tin sh1601ENG.SYS
TIN V1.7
Task name: SHAMRO Date: 21-MAY-96 Pri=0. Start=075000. EXTTSK=000000.
Label block revision: 0.
Task addresses - Low: 051000, W0 high: 177777, High: 177777
Load size: 02161400 Max size: 02161400 # of window blocks: 1.
Task flags (040100): -HD -CHK
Partition: SYSTEM Offset: 000000
System ID: RSX-11M.


TIN is a small program I wrote a long time ago to analyze task images 
under RSX.

That file, for example, is for the DS300 (which has a 68000 CPU). And 
the RSX MOP server can service that file. VMS can serve it too. But this 
is totally outside the MOP protocol itself.

The MOP protocol is documented in various places as well, so if you want 
that, you can find it. But the .SYS files are images that are served by 
MOP. They are not verbatim MOP data.

   Johnny

> 
> Look at first 256 bytes of SYS files:
> 
> 00000000: A8 00 30 00 44 00 58 00-00 00 00 00 30 32 30 35  
> |..0.D.X.....0205|
> 
> 00000010: 01 01 00 00 FF FF FF FF-FF FF FF FF 00 00 00 00  
> |................|
> 
> 00000020: 20 00 00 01 00 00 00 00-00 00 00 00 00 00 00 00  | 
> ...............|
> 
> 00000030: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  
> |................|
> 
> 00000040: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  
> |................|
> 
> 00000050: 00 00 00 00 00 00 00 00-03 4D 4F 50 00 00 00 00  
> |.........MOP....|
> 
> 00000060: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  
> |................|
> 
> 00000070: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  
> |................|
> 
> 00000080: 04 56 31 2E 30 00 00 00-00 00 00 00 00 00 00 00  
> |.V1.0...........|
> 
> 00000090: 00 00 00 00 00 00 00 00-05 30 35 2D 30 35 00 00  
> |.........05-05..|
> 
> 000000A0: 00 00 00 00 00 00 00 00-10 00 87 15 00 00 00 00  
> |................|
> 
> 000000B0: 80 00 00 00 02 00 00 00-00 00 FF FF FF FF FF FF  
> |................|
> 
> 000000C0: FF FF FF FF FF FF FF FF-FF FF FF FF FF FF FF FF  
> |................|
> 
> 000000D0: FF FF FF FF FF FF FF FF-FF FF FF FF FF FF FF FF  
> |................|
> 
> 000000E0: FF FF FF FF FF FF FF FF-FF FF FF FF FF FF FF FF  
> |................|
> 
> 000000F0: FF FF FF FF FF FF FF FF-FF FF FF FF FF FF FF FF  
> |................|
> 
> Thanks,
> 
> Tim
> 
> 
> 
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-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol