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Parallel port & SCSI
I have an older HP scanner, and it has a DB25 connector for SCSI.
A DB25 connector is just one standard for SCSI and it is true, a DB25 connector is also used for parallel printer ports. SCSI can also be daisy changed and why there is second DB25 connector on your scanner. wrote: ... it has a SCSI interface with a SCSI card included, but looking at the scanner, it appears to have a parallel port interface(right number of pins), including a connector with a printer symbol, presumably for sharing the parallel port. Can anyone explain this seeming contradiction? |
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Walt wrote:
I have an older HP scanner, and it has a DB25 connector for SCSI. A DB25 connector is just one standard for SCSI and it is true, a DB25 connector is also used for parallel printer ports. I don't think DB25 is standard for SCSI, but it _was_ used, standard or not. SCSI can also be daisy changed and why there is second DB25 connector on your scanner. wrote: ... it has a SCSI interface with a SCSI card included, but looking at the scanner, it appears to have a parallel port interface(right number of pins), including a connector with a printer symbol, presumably for sharing the parallel port. Can anyone explain this seeming contradiction? |
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"Walt" wrote in message ...
I have an older HP scanner, and it has a DB25 connector for SCSI. A DB25 connector is just one standard for SCSI and it is true, a DB25 connector is also used for parallel printer ports. SCSI can also be daisy changed and why there is second DB25 connector on your scanner. Yes, these scanners were only SCSI. And I'm not even sure you can get it working with a standard SCSI board in your PC. You are probably 'locked' to the SCSI board that came with the scanner. In those days that wasn't unusual - even HP delivered scanners with proprietary SCSI boards. Martin |
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Reading the linked Calcomp Manual, the scanner is scsi model, not a parallel
port model. All he needs is scsi card and scsi cable with proper end connectors for card and scanner. The two ports on the scanner are for connection to the card and connection to any scsi device daisy-chained to it. Herb "Barry OGrady" wrote in message ... On Tue, 09 Sep 2003 12:30:37 -0400, Walt wrote: wrote: ... it has a SCSI interface with a SCSI card included, but looking at the scanner, it appears to have a parallel port interface(right number of pins), including a connector with a printer symbol, presumably for sharing the parallel port. Can anyone explain this seeming contradiction? I have an older HP scanner, and it has a DB25 connector for SCSI. A DB25 connector is just one standard for SCSI and it is true, a DB25 connector is also used for parallel printer ports. SCSI can also be daisy changed and why there is second DB25 connector on your scanner. His scanner probably connects to a printer port, as mine does. The second DB25 is to allow a parallel printer to be used on the same port. I have a SCSI external hard drive unit that connects to the computer by a printer port. -Barry ======== Web page: http://members.optusnet.com.au/~barry.og Atheist, radio scanner, LIPD information. Voicemail/fax number +14136227640 |
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On Fri, 12 Sep 2003 02:59:33 +1000, Barry OGrady
wrote: On Wed, 10 Sep 2003 17:34:19 -0400, "Cyborg-haf" wrote: Reading the linked Calcomp Manual, the scanner is scsi model, not a parallel port model. All he needs is scsi card and scsi cable with proper end connectors for card and scanner. The two ports on the scanner are for connection to the card and connection to any scsi device daisy-chained to it. Why the printer symbol? My scanner connects to a printer port. The second DB25 is to allow a parallel printer to be used on the same port. I have a SCSI external hard drive unit that connects to the computer by a printer port. -Barry I'm being confused by the words you're using. Is your SCSI external hard drive actually connected through a printer (parallel) port, or using a DB25 connector? -- Bill Replace "g" with "a" Experience is what you get when you expected something else. |
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