6 Aug
2015
6 Aug
'15
11:05 a.m.
On Thu, Aug 6, 2015 at 12:41 PM, Guy Sotomayor <ggs at shiresoft.com> wrote:
Back to the MP 3000. There are a number of CPUs in
the box. Two are the
most
obvious: the SBC running OS/2 and the actual S/390 CPU. However, there is
another
S/390 CPU in the box as well. It is not visible (at least directly) to S/W.
It is responsible
for providing the high performance I/O capabilities (like native disk access
and making
them appear as conventional channel attached devices instead of RAID-5 SSA
drives).
The OS/2 SBC is there to emulate some of the slower devices (card
reader/punch,
direct attached 3270s, etc).
So the OS/2 computer is actually a component of the mainframe's
control processor, not a separate PC?