UniBone: Linux-to-DEC-UNIBUS-bridge, year #1

W2HX w2hx at w2hx.com
Fri Nov 15 15:58:22 CST 2019

This is interesting indeed. But if someone wanted to emulate a new function with the QSIC, would they need to be able to program in verilog (or fpga language)? I think an interesting angle using something like a BBB is that there is probably a range of languages that could be used to implement functionality. I don't know how many people know how to program an FPGA (or maybe a lot of peope do, but just not me :)

73 es GUD DX Eugene W2HX
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Nigel Johnson via cctalk <cctalk at classiccmp.org>
Sent: Friday, November 15, 2019 3:26 PM
To: David Bridgham via cctalk
Subject: Re: UniBone: Linux-to-DEC-UNIBUS-bridge, year #1

I think you will win a lot of friends if you can make something that
will emulate MSCP devices on the QBus - I have a micro11 and microVax
sans disk due to only having ESDI ate ST506 controllers!

cheers es 73 to the hams amongst us de Nigel ve3id

On 15/11/2019 15:23, David Bridgham via cctalk wrote:
> On 11/15/19 3:01 PM, W2HX via cctalk wrote:
>> LOVE the ideas, loved it when I first heard of it. But I'm a QBUS guy! Put me on the list when (if) you ever make one for qbus. GREAT idea!
>> Eugene
> Along these lines, it's been a long time since we've updated the list
> regarding the QSIC project.  Have been slowly working away on the
> project here.  The QSIC is, at a high level, similar to the UniBone
> except it's on the QBUS and it's based around an FPGA rather than a BBB.
> Work that's gone on is that the Verilog code has been written to access
> the DDR SDRAM we have so we can support larger RAM disks and eventually
> the Able ENABLE.  Haven't tested it yet.
> Also have made good progress on designing the prototype circuit board to
> replace our wire-wrapped test board that's served us well so far.  Some
> final checks and it'll soon be time to send off to China and learn about
> having circuit boards assembled.  Speaking of that circuit board design,
> I put in the option to add bus termination resistors but they require a
> part that no-one seems to stock.  I had a request in to Mouser to get it
> for me and they said they'd look into it but I haven't heard anything
> back for a few weeks now.  This jogs my memory to chase them a little to
> find out what's happened.
> Anyway, the web page for the QSIC is here along with a KiCad rendering
> of what the prototype board would look like and a slightly more accurate
> diagram of what the internal modules are like (may still modify that
> some more as I learned about the AXI interface and may use that for
> getting to the bus and that'll change how the crossbar switch works).
> http://pdp10.froghouse.org/qsic/html/overview.html
> Dave

Nigel Johnson

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