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Pastimes : Dream Machine ( Build your own PC ) -- Ignore unavailable to you. Want to Upgrade?

To: Zeuspaul who wrote (364)	3/14/1998 10:06:00 PM
From: fred woodall	Respond to of 14778

Let's add a little fire to the conversation: Gateway G-6200 (200Pro) / 128EDO / 6.2SCSI HD / Ext.Jazz / SCSI CD / Four 21" Viriton monitors plugged into a STB MVP 3D multi-monitor Video / ISDN /BMI satellite Receiver / 3COM 100 EtherFast Gateway G-6200 (200Pro) / 248 EDO / 3.2 SCSI HD / 6x SCSI recordable / Three 21" Monitors attached to a STB MVP 3D multi-monitor Video / One NEC XE17 monitor / Int.zip / BMI Receiver via same satellite / 3Com 100 EtherFast About to hook up:DELL 266/64SDRAM/6.4 HD/19"Sony Monitor/ISND running PC Quote's NASDAQ LEVEL II for 30 day trial. (Any input would be appreciated concerning PC Quote). Besides the data provider (BMI) which is rated a B- I think the system is near completion. Haven't ran into many problems other than daily maintenance however the heat off 8 monitors in a small room is hell in the summer time. Other than that I'm happy. Anyone dealing with MA Trading? Looks really good.

To: Zeuspaul who wrote (364)	4/7/1998 1:06:00 AM
From: Zeuspaul	Respond to of 14778

Mixing SCSI devices Found this response on Anand's BBS computerheaven.net The link is to the posting series, I found this response the most informative computerheaven.net (I think it is a different dirk) The SCSI adapter can talk to every device at the maximum speed which this device supports. It will use normal FastSCSI for transfers from the cdrom and UltraSCSI transfers from the hard disk. Slower devices can only slow down a faster device while they are active, that means if you have a FastSCSI device which transfers data at 10MB/s, it will use 100% of the available SCSI bus transfer rate, while a UltraWIDE device which transfers data at 10MB/s only uses 25% of the available SCSI bus transfer rate. So if you have a lot of olderSCSI devices it can make sense to use a dual channel adapter. For only one cdrom it's overkill and a waste of money. Lets assume that your cdrom can transfer 3MB/s, that 30% of the 10MB/s FastSCSI transfer speed limit. So you have 70% SCSI bus transfer rate left, which would translate to 14MB/s(70% x 20MB/s) for a UltraNarrow hard disk and 28MB/s(20% x 40MB/s) for a UltraWide hard disk. A more important reason to use a dual channel SCSI adapter would be if you have a SCSI device which does not confirm to the SCSI specifications and blocks the SCSI bus while it transfers data. Some scanner belong to this category. Please note that even this scanners only slow down a hard disk while they are active. BTW, even with SCSI you can only transfer data from one device at a time. But SCSI has a feature called disconnect/reconnect. From a SCSI FAQ: " The concept of disconnect-reconnect is what allows SCSI to be multi-tasking or multi-threaded. Disconnect is the process of a target (or initiator) disconnecting from the bus when it experiences a delay in completing a task so that another device can make use of the bus. The concept of disconnect-reconnect is what provides the ability of SCSI to initiate and complete more than one task at a time. A result of the "intelligence" of SCSI that allows an initiator or target to disconnect from the bus while it is performing a task, such as locating some information at a specific address, and, once it has located the information, reconnect to the bus in order to complete its task. Optimizes use of the bus bandwidth. " That's the problem with some scanners, they don't support reconnect/disconnect. dirk