3B1, 3B2, & 3B5

[rjd at occrsh.ATT.COM]

>/* Written  6:06 pm  Mar  2, 1988 by eric at magic4.UUCP
>.....
>3B2/400, 3B2/500, 3B2/600.  The /300 supports around 10 users (light users)
>and can have upto ~300M of disk.  The /600 can support almost 100 users and 
>have upto ~2G of disk.  The rest are somewhere in the middle.  The 3B5 is
>a large machine, and from what it sounds like, it is bigger than you need.

  Corrections, of a sort:  The /310 (replacement for the 300) comes with
a minimum of 30 MB formatted disk internal, or you can get the 72MB formatted
internal disk.  With the addition of the SCSI subsystem, you can conceivably
expand this, using AT&T add-ons, to a total of 56 300 MB disks, for a total
of 16.8 Gb mass disk storage. [two SCSI Host adapters, each hosting seven disk
controllers, each controlling four disks ].  Yeah, a bit absurd, yet you CAN
do it. RAM memory is a maximum of 4 Megabytes, 2 MB is stock for some, 1 MB is
stock for others.
  The /400 comes with four different stock internal disk configurations, based
on the four combinations you can make with one or two, 30 MB or 72 MB disks
(not mixing disk sizes).  The addition of the SCSI bus allows the same
expansion as the /310.  Memory size options are the same as the 310.  The
model 400 will allow eleven additional option card slots (the first slot taken
by the cartridge tape drive controller, whether it be the 23 MB old style or
the SCSI 60 MB controller), where the model 310 only has four option slots.
  The model 500 has six option slots (first of the seven taken by the SCSI
host adapter for the integral disk, yet you can hook another six controllers
onto this HA), from four to eight MB of RAM, and integral disk at 147 MB
(expandable as with the 310 or 400).
  The model 600 has eleven option slots (first of the twelve taken by the SCSI
host adapter for the integral disks, yet you can hook another six controllers
onto this HA), from four to sixteen MB of RAM, and integral disk at 294 MB
(expandable as with the 310 or 400).  The model 600 also comes with a virtual
instruction cache board, and slots for other cards such as the co-processor
board that will also fit into the 500.

Randy