Re: OSI Compliant VME Support

[Andrew Johnson <anj@aps.anl.gov>]

Hi Michael,

On 02/23/2016 10:38 PM, Michael Davidsaver wrote:
> https://github.com/mdavidsaver/xycomioc
> 
> Support for 220, 240, and 566 cards.  Tested with RTEMS and vxWorks. 
> Can't remember how feature complete.  Other than checking that it builds
> just now, I haven't looked at it since 2010.  This code holds some
> sentimental value to me as it's one of my first epics drivers, and the
> only one I found a good name for.

Nothing against your drivers, but Matt should understand that they were
not derived from the xycom drivers that were included with Base-3.13.x
and earlier. IIRC the original xycom digital drivers had a slightly
unexpected mapping between the signal address and I/O channels (S0 is
not port 0 bit 0). The xy240 driver also has a background thread that
emulates I/O Interrupt scanning.

I suspect Matt has existing applications that expect the original
capabilities, so compatibility may be important to him.

- Andrew

-- 
There are only two hard problems in distributed systems:
  2. Exactly-once delivery
  1. Guaranteed order of messages
  2. Exactly-once delivery
 -- Mathias Verraes