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Old 22 November 2021, 04:08   #1
reinauer
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ReA4091: SCSI2 on Zorro III for everyone!

Hi and welcome to the latest and greatest project by Chris Hooper and me: ReA4091.

All in all there were only two ZorroIII capable SCSI controllers ever made: The A4091/DKB4091 and the Phase5 Fastlane Z3. The Fastlane, by being a closed source fortress, is completely useless. It can not be repaired, or improved. But all GAL logic source code for the A4091 has been made available by Dave Haynie.

So on my first visit to Germany since the pandemic started, I was finally able to pick up a DKB4091 that I "won" on eBay. Back home in sunny California, a new project was born:




At the moment the project is in its Proto0 phase. Schematics and PCBs have been drawn and verified, and we had OK2FAB last week. Now waiting eagerly for the PCB delivery so that we can jump right into our board bringup late November / early December.

Of course there are countless ideas already:
  • Move the GALs and other logic chips into a CPLD
  • Use the additional space to add some RAM
  • Since the NCR53C720/725 can also cope with the 68030 bus, they could be a potential upgrade path
  • The card could be shortened to save cost
  • Integrate SCSI2SD

Ideas, ideas, ideas, a dime a dozen. But for now the goal is to produce a working board that is as close as possible to the original (plus easter eggs of course)

Stefan

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Old 02 December 2021, 21:03   #2
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This looks like an interesting project, I might get one to replace my Phase 5 Fastlane Z3 card.
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Old 02 December 2021, 21:27   #3
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Small update

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Old 02 December 2021, 21:53   #4
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I'm always amazed at what dedicated and knowledgeable Amiga fans can achieve!

For the future extra features it would be nice if the re-created controller could easily utilize the RaSCSCI solution.
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Old 02 December 2021, 23:15   #5
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Nice project. Do you intend to open source it?
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Old 03 December 2021, 00:39   #6
jbenam
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I have wanted an A4091 for a very long time, great stuff!

Do you intend on selling pre-assembled cards, or PCBs? If the latter, I am up for one PCB
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Old 03 December 2021, 07:14   #7
reinauer
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Still figuring the details of distribution out. First the card needs to be working. The hope is to open the design up, of course. Life is too short to waste it on closed source stuff.
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Old 03 December 2021, 16:23   #8
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Following!
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Old 03 December 2021, 17:37   #9
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Great to see this project! I don’t have a particular need for a 4091 right now, but I might in the future. If so, I’d be interested in a fully assembled card - I’m not skilled enough to assemble from parts.
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Old 03 December 2021, 18:26   #10
shaf
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I could assemble some card for others.

Shaf
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Old 04 December 2021, 17:39   #11
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Awesome work!
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Old 04 December 2021, 18:09   #12
nogginthenog
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Nice. That is a huge zorro card!
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Old 04 December 2021, 22:32   #13
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Really great project, i am excited which way it will continue

Quote:
Originally Posted by btp View Post
For the future extra features it would be nice if the re-created controller could easily utilize the RaSCSCI solution.
Unfortunately is RaSCSI way to slow for this card.
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Old 05 December 2021, 01:47   #14
dalek
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I need this in my life <3
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Old 05 December 2021, 01:50   #15
dalek
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Quote:
Originally Posted by LucasBox View Post
Unfortunately is RaSCSI way to slow for this card.

True, but as one device of many it could be useful to include PI mounting holes in the area on the PCB where the HDD goes.
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Old 05 December 2021, 12:53   #16
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That's right, mounting holes for:Raspberry 2-4, Zero and SCS2SD 5 + 6 would be nice.
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Old 05 December 2021, 13:40   #17
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Really nice!!
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Old 05 December 2021, 20:24   #18
reinauer
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Looking good:



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Old 05 December 2021, 20:34   #19
Damion
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Wow, outstanding work!

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Old 06 December 2021, 02:22   #20
NorthWay
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That looks like a lot of logic - can't those be consolidated?
Cool stuff!
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