24 March 2017, 16:39 | #21 | |
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This project is not an "ambitious WIP", you can build your interface and download the software and use it now. On the X68000. There's nothing to be skeptical about, the system works. Why do I even bother replying to your nonsense once again? Ugh. |
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25 March 2017, 01:23 | #22 | |
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For the times when I'm at least half right?
Anyway, fair enough, Amiga SCSI networks are not new. Quote:
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25 March 2017, 14:42 | #23 | |||||
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Here, have a read: http://www.wonkity.com/~wblock/SCSI/SCSIExamples.html |
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25 March 2017, 16:49 | #24 |
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@Thread
Sorry Pat, there is a lot of incorrect information about Amiga and SCSI in general there sir. It's easy to get turned about in SCSI land, I remember my first year working with industrial SCSI arrays and systems in Industrial land - that is an eye opener and steep learning curve thats for sure. Sadly a lot of miss-information about SCSI is propagated on the web in general - its not an ART as some say it is a very simple and exact science you just need to approach it properly (almost as if you are setting up an IPX network ) Have a read here chap this will get you up to speed - I have posted some some articles on here and AmiBay about SCSI and DMA SCSI on the Amiga and I would humbly suggest having a look at the ABLE SCSI project for the Amiga (it should be on aminet.net) - it will take your knowledge to the next level - This way my friend we can have a discussion on the method and Protocols thats are emulated by the RPi to throw data to and from the SD Card via the SCSI BUS - also (TCP/IP over SCSI) excites me a lot - Sadly with some of those statements posted while were discussing Narrow / Wide implemented SCSI 1 / 2 protocols (and their conjunctions) - it kinda seems you are arguing the colour of a blue crayon. So read some of those links bud, come back fresh and lets have a real discussion on how this could / would be implemented within an Amiga SCSI host =) |
25 March 2017, 20:43 | #25 | |
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http://amiga.resource.cx/exp/paradox Fascinating link Iggy. Author clearly didn't know how you can attach 16 bit and 8 bit devices to the same cable and controller (3 terminators in the chain, but number 3 just masks off the extra 8 bits of data on the 50 pin ribbon cable from the 8 bit devices beyond it. Not a hack. https://en.wikipedia.org/wiki/SCSI_h...te_termination But hey, never can happen on an Amiga, right? You are saying there are no 16 bit SCSI controllers on the Amiga. Potentially, more than you might think. Try plugging in an FAS216U to an Amiga controller with a standard FAS216 based controller... http://ps-2.kev009.com/ohlandl/SCSI/..._datasheet.pdf You might also get some joy with the expansions based on the NCRC94, such as the Flyer. 16 bit internally, but AFAIK Amiga implementations do not use 16 bit 50 pin SCSI cables, except as 8 bit 50 pin SCSI cables. I would strongly urge SCSI card owners to look up their card, controller chip, and upgrade potential and make their own minds up, rather than relying on flame warriors who have used less than a dozen different Amiga SCSI controllers, and who simply "believe" that Amiga SCSI can only ever be 8 bit except with a Phase 5 product or a Warp Engine. Even a humble WD33C3 controller can sometimes do up to 10MB second synchronous transfer, but sadly most A1200 Blizzard SCSI kits are limited to SCSI one speeds. Tough. http://amiga.resource.cx/search.pl?product=SCSI Jope, good luck, the drive side should be OK at least. Last edited by Pat the Cat; 25 March 2017 at 23:08. |
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25 March 2017, 21:31 | #26 |
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I dont want to reply to this, but just...
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25 March 2017, 22:44 | #27 | |
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Better link concentrating on how parallel SCSI and a separate link to connector standards here. Still far from perfectly accurate though. https://en.wikipedia.org/wiki/Parallel_SCSI https://en.wikipedia.org/wiki/SCSI_connector |
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25 March 2017, 22:56 | #28 | ||
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Edit: In what is an extremely rare occurrence, it appears Pat has realised he made a mistake and corrected it by deleted that line from his post. Quote:
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25 March 2017, 23:06 | #29 |
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I'm sure all the high end Toaster users are chomping at the bits to use this.
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25 March 2017, 23:31 | #30 | |
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Flyers do, but they require a certain speed of device to work properly. Which could be an issue or the device might make the grade. Doubtful but it remains to be seen. |
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25 March 2017, 23:38 | #31 | |
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Yes indeed, as wel as an extended command Set, SCSI-2 also specifies extra pins for things like reselect signal. This is has been the problem for 30 years, people thought "SCSI compatible so it works, no problem" without considering how better, faster storage could be done with right devices, right cabling, right terminators. |
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26 March 2017, 00:51 | #32 |
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@Pat_the_Cat
I do enjoy your enthusiasm - its refreshing when some one "go's at it" instead of wombles about the place =) Now, at a risk of digressing the thread further - I am curious as to why you believe this is the case - what evidence do you have to suggest this? |
26 March 2017, 05:43 | #33 |
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Actual chips used NCR53C96. Observe closely that both rows of each SCSI connector has pins connected.
Yet according to some, half of the 50 pin connector on SCSI 2 controlers were always grounded. Never connected. No change at all from SCSI-1 to SCSI-2 cables. Not that SCSI ever formally defined connections. http://amiga.resource.cx/photos/phot...res=hi&lang=en It's no wonder SCSI-2 is described as "obsolete". Even for people making genuine 16 bit SCSI bus controllers, the moment somebody plugged in an external drive, the whole lot ran at the slower bus rate. People making devices that could talk at higher speeds always had the devil's own time demonstrating that it actually did so unless plugged into a suitable controller. I guess the real acid test would be a solid state card box, with a 50 pin and 68 pin connectivity, that actually had a screen that displayed what sized data bus it was currently using. Also the throughput data rate, that would be nice. It's not going to happen with this device, but a Hat might be doable. Tricky part is getting it visible from inside a case... er... |
26 March 2017, 08:31 | #34 |
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Oh man! Another thread filled with crap and misinformation. Where does it end?
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26 March 2017, 14:31 | #35 | ||||||
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"half the conductors on the 50-pin SCSI-I and SCSI-II ribbon cables aren't active" I didn't say they weren't connected. They're all ground except for one, and are used for shielding and isolation purposes on long ribbon cables, similar to ATA-66 cables. Quote:
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I have a SCSI-II setup here now. It runs at 10MB/s. If I connect and external drive, it runs at 10MB/s. Absolutely no effect on performance. Quote:
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26 March 2017, 16:32 | #36 | |||||||
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Or rather, I suppose you're doing your usual thing: speculating, spreading misinformation and derailing. Quote:
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26 March 2017, 20:25 | #37 |
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I have a ZiLOG Z53C8003...
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12 April 2017, 12:29 | #38 |
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It has now been confirmed working on Raspberry Pi 1B as well.
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12 April 2017, 12:51 | #39 |
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Using what system on the other end? x68k still?
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12 April 2017, 14:49 | #40 |
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Naturally.
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