Rockwell Automation 6000 Industrial Computers Technical Reference Guide - Manual (Page 4)

K6-2 366MHz processors. The Pentium 166 and MMX233 are on Intel’s long-life or
embedded roadmap.
Slot 1
Intel changed to a “Slot 1” package with its Pentium II, Pentium III, and Celeron
processors. The “Slot 1” package is a cartridge that plugs into the motherboard at a right
angle. Some of the high-end Intel processors are still available in Slot 1. The 6155 and
6180 Pentium III options are currently Slot 1 designs, but will be migrating to Socket 370
with the next motherboard release. No Intel Slot 1 processors are on their long-life or
embedded roadmap.
Socket 370
Intel is now offering a “Socket 370” design in its new Pentium III and Celeron
processors. Socket 370 processors have a more traditional integrated circuit package.
The 6155 Celeron 433MHz CPU card is a Socket 370 design. The upcoming 6155 and
6180 new motherboard will be a Socket 370 design. The Pentium III 600MHz processor
in Socket 370 packaging is on Intel’s embedded roadmap.
RAM
Computer random access memory (RAM) is packaged in either Single-Inline-Memory-
Modules (SIMMs) or Dual-Inline-Memory-Modules (DIMMs). DIMMs are used today
in most computers, because they offer a higher density. DIMMs are currently available
in up to 256MB configurations. Computer motherboards and CPU cards have from 1 to 4
memory sockets. In older SIMM socket designs, 4 memory sockets are organized in 2
memory banks, 2 sockets to a bank. The SIMM devices in each bank must be the same
size. Today’s computer boards with DIMM sockets to not have this restriction.
Hard Drives
Computer hard drives are mass storage devices to hold the operating system, application
programs, and data files. Today’s hard drives are usually a single-platter device. The
most popular size is a 3.5-inch platter for desktop systems. 2.5-inch platter hard drives
are used in laptop computers. The hard drive connects back to the computer through
either an EIDE or SCSI parallel bus. EIDE hard drives are the most popular because it is
a less expensive interface. SCSI hard drives typically support faster data access times,
but cost more than EIDE drives. Today’s 3.5-inch hard drive capacities start at around 10
Gigabytes, and are available up to hundreds of gigabytes.
Hard drives are the fastest-changing technology in a computer system. Vendors typically
only support specific models for 3 to 6 months. RAC6000 computers buffer these rapid
changes by offering memory size ranges instead of specific sizes. These ranges are
current Medium (8-13GB), Large (13-30GB), and Extra Large (30+GB). All single hard-
drive computers use EIDE hard drives. The RAID1 dual hard drive option uses SCSI
hard drives.