HP HP-2117F on ebay
jwest at classiccmp.org
Thu Dec 14 15:03:30 CST 2006
>> Well, it isn't an F series. An F series consists of the proper firmware
>> ROMs (SIS, VIS, FFP, FPP) and the external FP processor, but everything's
Ok, this piqued my curiosity so I went to the manuals and checked.
The F series consists of the 2111F and the 2117F. The 2117F has an external
hardware floating point unit mounted in a rackmount chassis underneath the
cpu chassis. The 2111F also has a hardware floating point unit, but it is
not mounted in a external chassis. It is mounted INSIDE the normal 1000
series chassis. I'd be curious to see just how that was done! There is
obviously no room for the same physical parts. Perhaps it was put in the
memory cage and the cable run to the MPP port? In any case, it must have
been a very different card(s) (although functionally equivalent). Aha... I
just found a picture in the manual that may elucidate this. The 2111 chassis
is just as tall as the 2117 chassis, but it has 5 less I/O & memory slots at
the top. Methinks the space at the top is where a 2111F specific hardware
floating point unit must go.
So, an F series doesn't always have the external FP processor. They all do
have hardware floating point processors as separate systems. Oddly enough,
the 2111F doesn't have DMS as standard while the 2117F does. That accounts
for the difference in instruction set counts.
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