RE:Re: New Risc and Decision Data Terminals

Don't know where (or even if) this is documented somewhere, I got the
information from second-level support after having severe problems for over
a week in a CISC/RISC conversation case.
The 266C card should be ok, I have never had any problem with them.

// Stefan







John Hall <jhall@hillmgt.com> on 99-02-10 20:06:11

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 To:      MIDRANGE-L@midrange.com                             
                                                              
 cc:      (bcc: Stefan Tageson/MMX/Sema Group/SE)             
                                                              
                                                              
                                                              
 Subject: Re: New Risc and Decision Data Terminals            
                                                              








Where is this documented ?

What about the 266C card which is the first controller on my 170 ?

TIA

John Hall
Home Sales Co.
stefan.tageson@notes.sema.se wrote
>
> If the terminals are connected thru a 2720,2722 or 6180 twinax card there
> will be a couple of new options that you might want to disable:
>
> 1. Split port operation, the new wsc will operate at two ports
> concurrently.
> 2. Optimized mode, a feature that eliminate communication overhead (read
> cut off headers) in the data stream
> 3. 2 Mbps mode which is a doubled clock frequency.
>
> My own experiences so far is that feature 1 normally makes
fiber-to-twinax
> boxes go crazy, especially in combination with feature 3 and that some
none
> IBM devices are unable to handle feature 2 and/or 3.
> To disable these innovations you have to create a dataarea in qsys with
the
> same name as the controller ,eg QSYS/CTL01 with length *char 6
> with the following values:
>
> position 1-2 = split port operation      '00' disables, 'FF' enables
> position 3-4 = 2mbps mode                           '00' disables, 'FF'
> enables
> position 5-6 = optimized mode      '00' disables, 'FF' enables
>
> use capital letters for the FF value.
>
> After creating the dataarea(s) do a vary off and vary on for the changes
to
> take effect.
> Good luck!!
>
> // Stefan Tageson
>
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