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- Path: nntp.net-link.net!news
- From: mikew@net-link.net (Mike Williams)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Zip drive...~500K transfer rate?
- Date: 2 Apr 1996 03:41:24 GMT
- Organization: DC Productions
- Message-ID: <4jq7l4$mu6@leol.net-link.net>
- References: <4j6hot$bf8@hobbes.compusult.nf.ca> <4j7e0l$3av@guava.epix.net> <4jalea$ru9@leol.net-link.net> <65641402%agos001@pn.itnet.it> <4jm5me$bt0@genesis.phantom.com>
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- In article <4jm5me$bt0@genesis.phantom.com> darkrain@mindvox.phantom.com (Swiftshadow) writes:
- > Stefano Agostinelli (agos001@pn.itnet.it) wrote:
- >
- > : Well my A3000 has a SCSI I ctrl but it still manages to achieve 1.2MB/s
- > : for the Zip! The reason you get that low transfer speed is that Emplant
- > : SCSI is crappy, not because it is SCSI I!
- >
- > Not exactly, the A3000 controller IS SCSI II. What it doesn't support is
- > SCSI Fast addition to the SCSI II protocol. I get somewhere in the
- > neighborhood of 3.5 megs with synchronous transfers enabled on my Quantum
- > Trailblazer 850. So don't blame the A3000 controller. It is quite
- > capable of recieving the data. As to whether Emplant SCSI is good or not
- > I am not sure. But I kind of doubt that Emplant would have put a SCSI I
- > controller in the Emplant board given the time it was made (The A3000 had
- > SCSI II and it was made back at beginning of the decade.)
-
- Believe it. Taken right out of the Emplant documentation : "The SCSI interface
- uses the popular 53C80 SCSI IC. It is a fast and reliable SCSI controller. It is not
- SCSI-II. Transfer rates can be well over 1 megabyte per second depending on the
- processor your Amiga has and how fast the device you are using is. ..."
-
- I tend to disagree with some of the claims: Specifically "fast and reliable" and
- "well over 1 megabyte per second." On my 4000, the SCSI port has NEVER worked
- reliably. I have fiddled with termination, changed jumpers, and replaced the LOGIC
- chip with the Western Digital with no effect. It does manage to drive my CD-ROM
- drive, but using anything else is pointless. I could very briefly get about 800K/s
- with a Quantum 540 meg drive, and about 500 K/sec with the Zip drive for about
- 5 megs before it locks up. In all fairness, though, the Dataflyer 4000 I had for
- a while couldn't do significantly better with the Quantum.
-
- --
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