Overview:
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This is the code that gcc produces at the top & the bottom of
-each function, it usually is fairly consistent & similar from
-function to function & if you know its layout you can probalby
+each function. It usually is fairly consistent & similar from
+function to function & if you know its layout you can probably
make some headway in finding the ultimate cause of a problem
after a crash without a source level debugger.
IOP's can use one or more links ( known as channel paths ) to talk to each
IO device. It first checks for path availability & chooses an available one,
then starts ( & sometimes terminates IO ).
-There are two types of channel path ESCON & the Paralell IO interface.
+There are two types of channel path: ESCON & the Parallel IO interface.
IO devices are attached to control units, control units provide the
logic to interface the channel paths & channel path IO protocols to
The 390 IO systems come in 2 flavours the current 390 machines support both
-The Older 360 & 370 Interface,sometimes called the paralell I/O interface,
+The Older 360 & 370 Interface,sometimes called the Parallel I/O interface,
sometimes called Bus-and Tag & sometimes Original Equipment Manufacturers
Interface (OEMI).
-This byte wide paralell channel path/bus has parity & data on the "Bus" cable
+This byte wide Parallel channel path/bus has parity & data on the "Bus" cable
& control lines on the "Tag" cable. These can operate in byte multiplex mode for
sharing between several slow devices or burst mode & monopolize the channel for the
whole burst. Upto 256 devices can be addressed on one of these cables. These cables are
DASD's direct access storage devices ( otherwise known as hard disks ).
Tape Drives.
CTC ( Channel to Channel Adapters ),
-ESCON or Paralell Cables used as a very high speed serial link
+ESCON or Parallel Cables used as a very high speed serial link
between 2 machines. We use 2 cables under linux to do a bi-directional serial link.
OSA 7C14 ON OSA 7C14 SUBCHANNEL = 0002
OSA 7C15 ON OSA 7C15 SUBCHANNEL = 0003
-If you have a guest with certain priviliges you may be able to see devices
-which don't belong to you to avoid this do add the option V.
+If you have a guest with certain privileges you may be able to see devices
+which don't belong to you. To avoid this, add the option V.
e.g.
Q V OSA