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Pastimes : Dream Machine ( Build your own PC )
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To: Sidney Reilly who wrote (672)5/20/1998 1:00:00 AM
From: Zeuspaul  Read Replies (2) of 14778
 
>>What are some of the differences between SCSI devices and cards that impact performance?<<

I am not sure I understand the question.

I will give you an example of my setup. I have an HP 2C flatbed scanner and an HP 4C flatbed scanner. Both scanners came with cards. Both scanners are SCSI scanners.

I installed the card that came with the 2C in a computer to operate the 2C. I tried adding another SCSI device (MO drive) to the scanner ( just plug it into the back of the scanner ) but no go. WHY? because the card is not a true SCSI card. It is designed to run the scanner only.

Instead of installing the card that came with my 4C scanner I purchased an Adaptec AHA2920? SCSI card. I installed this card and the scanner worked fine. I then plugged the MO drive into the back of the scanner and it worked. Why? because the Adaptec card is a true SCSI card. ( I actually changed the sequence ie. MO drive first and then scanner as the MO drive was not always recognized. The scanner cable is long and SCSI has length restrictions.)

I do not know how to verify that a scanner is truly SCSI. I have always used HP scanners and have had no problems. I would guess that some low end scanners may be a problem. The scanner documentation should indicate the SCSI spec.

Zeuspaul
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