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The correct answer is of course the B. Of course this has nothing to do with me having half a dozen for sale

Everyone who wanted RAM should now have it. If anyone wants some then get in touch sooner rather than later. I'm going to start listing the remaining stock on a famous auction site.

Splendid weekend. It was great to see familiar faces and some new ones. Many thanks to Robert for organising this event again.

1024MAK wrote: ↑

Wed Jan 16, 2019 8:03 am

Note that I have not looked at the schematics to see how Acorn actually did this in any Arcs.

On the A3000 the ROM ~CS comes from the MEMC and ~OE is tied to ground.

Kazzie wrote: ↑

Mon Jan 14, 2019 11:16 am

I had to look it up myself. It's shadow RAM hiding in the OS ROM's address space. See http://www.boobip.com/hardware/osram

Original forum thead here: viewtopic.php?f=3&t=13147&hilit=osram

It's a shame you're not ABUGing next weekend. Perhaps you could ask someone from Manchester who is going to bring it down & hoglet to do a log?

Everyone needs some OSRAM :) Execute code from one bank and use the other bank for data without aby bank switching 8) . Make the C64 jealous. Plus you can rewrite the 6502 vectors at FFFA, C, E I could probably do a cost reduced (less fiddly to assemble) one or self assembly kit... all it is waiting...

I made another adapter board to see what I could get out of the WDC65C02 at 5v. A mod or two later this specimin is running at 33MHz from the BBC PSU. It'd go faster from an external & overvolt it a bit. Still not too shabby! Mandatory BASIC2 speed test results. It seems stable too. BBC BASIC CPU Ti...

Does anyone want me to bring anything specific? I'll pop a selection of my upgrades in the car just in case. I have another twin cumana floppy drive too I need to sell on, it is in great condition cosmetically. I also have a bunch of rather tidy Bs too so if anyone wants a smart B then 8) Is the eco...

Both the USA and EU have fair use provisions.

Now Christmas is over until next December November October I have built up some batch 2 PCBs. So if anyone else wants one of these A3000 RAM boards get in touch. I'll put the rest up for sale on a famous auction site. Batch 2 is it - I won't make anymore after that because I don't think there is the...

No-one has said anything outrageous (so no-one take offence at me saying this, please) but it feels like it is getting a little heated in here ... Sorry, I'm not being confrontational. I would like to know why this would not be fair use it seems textbook - educational video on generic VHDL programm...

Of course it is a rant.

Please explain at least one reason why this could be trademark infringement and not fair use.

Fair use. Comparing Xilinx to Altera is standard for a any FPGA related video.

If you misrepresent the company etc then yes... but using the Xilinx logo to represent Xilinx in a video? Fair use.

edit: pesky typos

An interesting video by Robert Feranec about Xilinx's recent behaviour... I'd love to know the motiviation Xilinx have but we never will I suppose. I wonder how long until Dave Jones (EEVBlog) does a video on this? https://www.youtube.com/watch?v=swVuqG9-H0E Edit: I wonder how long it'll be until th...

Some Kickstart switchers on the Amiga simply hook reset (and row/col from keyboard matrix) then press key & reset to switch OS. Or count multiple resets in within 1s say and change OS. Needs a reset signal flylead but is simple to use/comprehend.

I dry boards at 120C on fan. 15 mins check them and another 15 mins. Works a treat especially for trapped moisture in connectors or under ICs.

Yes 74LVC1G17GV from Nexperia IIRC

Don't check it against a Cumana memory expansion... they got it wrong. Which is why they fit so poorly!

If you want to buffer the A3000 MEMC lines then you'll need a buffer with 5V CMOS input threshold Vil not TTL like with LVC245 - else it will buffer the glitches. It is only the memc lines you would need to buffer - so 11 signals IIRC. Personally I wouldn't bother & I'd double register them at a hig...

Hopefully most people will have got their boards from batch 1 by now. Feel free to post positive or negative comments & photos! I've done extensive testing with it and it seems great.

Bump. All still current & in stock.

algenon_iii wrote: ↑

Sat Dec 08, 2018 8:08 pm

BBC Micro restoration from down under, most remarkable thing is the "replacement" PSU
https://www.youtube.com/watch?v=bC6h1rssuUI

That and it being what looks like a USA spec (or German?!) machine.

I may have over ordered on the right angle pin headers...

Batch 1 ready for final test and shipping

Issue 3 ( ) boards tested good & batch one is being built and cleaned.

I'll PM people on the list.

I have more chips and will be ordering more blank PCBs so if you want one then get your name on the batch 2 list. Once they are gone I won't be making anymore...

Ian has been busy testing and reports back zero errors! We've called it fixed now.

I'll update the sale thread. Batch one is built up, I have 11 boards in total (which I think is the exact number). I'll order more blank PCBs soon so batch 2 early/mid January I think.

Welcome!

The boards arrived today so I built one up to start testing. So far so good. I'll post one to IanS to see if it works in his computer.

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Update: (Latest) PCBs are on their way from China They usually take about a week airmail.