🚀 go-pugleaf

In article <1992Aug13.130026.18036@wam.umd.edu>, alan@wam.umd.edu (Alan J. Schunemann) writes:
>
>What's the difference between a 5000/200 and a 5000/120?
>

Off the top of my head.

o  The Model 100s put the CPU on a daughter card.  This makes it
   easy to upgrade the CPU and keep everything else the same.
   For example there are Models 120, 125 and 133.

o  The Model 120 is an R3000 (maybe A) that runs at 20 MHz.  The
   125 runs at 25 MHz and so on.

o  The Model 120 and family use parity memory.  You can use the
   same memory modules as are used on the DECstation 3100 and
   2100 (MS01-AA) or a higher capacity module (MS01-CA).

o  The TURBOchannel on the 100 series runs at half the speed of
   the TURBOchannel on the 200.

o  The 100 series has space inside the system enclosure for some
   SCSI devices.  The 200 doesn't.

o  At the same clock speed I believe the 200 is faster.  Probably
   due to different memory subsystems.

o  I believe the built-in SCSI adapter on the 100 series supports
   DMA transfers.  This ended up being less expensive than the one
   on the 200.  Of course it's still on that half speed TUROBchannel.

o  They use a different serial line interface.  Thus switching a
   system disk between the two require remaking the special device
   files for the mouse and serial tty lines.

o  The Model 120 will cost less than a model 200, for an otherwise
   comparible system (same amount of memory and disk space).

--
Alan Rollow				alan@nabeth.cxo.dec.com