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SCSI Hard Drive Glossary

  Acronym for small computer system interface. Pronounced "scuzzy," SCSI is a parallel interface standard used by Apple Macintosh computers, PCs and many UNIX systems for attaching peripheral devices to computers. Nearly all Apple Macintosh computers, excluding only the earliest Macs and the recent iMac, come with a SCSI port for attaching devices such as disk drives and printers.

 
 
  CSI interfaces provide for faster data transmission rates than standard serial and parallel ports. In addition, you can attach many devices to a single SCSI port, so that SCSI is really an I/O bus rather than simply an interface.

 
 
  There are different forms of the SCSI interface, and as time marches on, improvements have been made to the original SCSI design. Below is a chart with each interface and its speed.

 
 
 
Type
Bus Width
(bits)
Bus Speed
(MB/Sec.)
SCSI-1
8
5
Fast SCSI
8
10
Ultra SCSI (Narrow Ultra)
8
20
Ultra2 SCSI (Narrow Ultra2)
8
40
Fast Wide SCSI
16
20
Wide Ultra SCSI
16
40
Wide Ultra2 SCSI
16
80
Ultra3 SCSI (Ultra160)
16
160
Ultra320 SCSI
16
320
 
  The definitions above are listed in order from the slowest to the fastest type. In simple terms, there are two measurements to consider: Bus Width and Bus Speed.
 

Bus width is measured in bits and is either 8 or 16 bits. The easiest way to understand this is to relate to lanes on a highway. A 16-lane highway will allow for more traffic than an 8 lane highway. Of course the 16-lane highway will cost more.

Bus speed is measured in megabytes (MB). The rating represents how many megabytes can be accessed in a second. A higher rating represents faster access.

Besides the speed issues, another important feature of SCSI interfaces is that backwards compatibility has been incorporated in all new improvements. A rare situation for computer technology.

 

 
How do I get additional memory?

The following will help allow your computer to load programs into memory more efficiently allowing you to have more memory for MS-DOS programs / games.

Ensure you have the following lines at the beginning of your config.sys file.

DEVICE=C:\WINDOWS\HIMEM.SYS
DOS=HIGH,UMB
DEVICE=C:\WINDOWS\EMM386.EXE NOEMS

By placing the DOS=HIGH,UMB on the second line this can in some cases save memory because it is loading DOS into upper memory before loading the memory manager. Additionally the first and third line cannot be loaded into high memory because these lines are the memory managers.

Load all your devices in your config.sys and autoexec.bat into high memory.

How can I comment lines in batch or system files?
Remarking lines within the autoexec.bat or the config.sys allows you to temporarily or permanently prevent a line from loading each time you boot the computer. The method most commonly used is placing "REM " in front of the file you wish to skip.

REM PATH=C:\WINDOWS

If you are encountering issues with a line in the autoexec.bat it is highly recommended that you remark the line instead of removing it. This will prevent issues from arising if the line needs to be placed back into the appropriate file.

 
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