Search found 432 matches

by bprosman
Fri Oct 25, 2019 11:23 am
Forum: acorn atom and acorn system series
Topic: Yarrb - redesigned
Replies: 226
Views: 10444

Re: Yarrb - redesigned

I'm very curious to learn from your experience having the boards assembled.
by bprosman
Tue Oct 22, 2019 1:00 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

There was a discussion going on in one of the FB groups about this as well (maybe the same people :-) ). What I understand is that : /RFRSH is not tri-stated but also "not functional" when an external device is taking over the bus by a /BUSREQ signal. The Z80 datasheet I saw was referring to (long) ...
by bprosman
Mon Oct 21, 2019 11:49 am
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

Thanks Dave,

With some (script) tweaking I was able to generate the new files myself now and with a Windows batch file generate the PROM file (instead of the shell script).
by bprosman
Sun Oct 20, 2019 12:36 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

More some general github questions. If they pollute this thread too much I can move it (or open a seperate one). I'm working on a Windows (10) environment. How can I keep up with Dave's latest developements ? Is that just a matter of running : git clone https://github.com/hoglet67/AtomBusMon.git ? A...
by bprosman
Sat Oct 19, 2019 4:25 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

Single stepping using the ICE, or single stepping using the MPF monitor?
It would't surprise me if there is still an issue with the ICE single stepping on the MPF, because of the MPF's use of NMI and M1 cycle counting.
Single stepping on the MPF-1B.
Let me play with the other system first.
by bprosman
Sat Oct 19, 2019 3:38 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

Today I finished my board for the Z80, the core that has been loaded is the multi-CPU version. For now I only did the basic testing : 1. Put in an MPF1-B, that boots fine. Did some single stepping but that ran into an SYS-SP error, that might be me though, as it was 35 years ago I used a MPF1-B 2. P...
by bprosman
Thu Oct 17, 2019 12:20 pm
Forum: acorn atom and acorn system series
Topic: Yarrb - redesigned
Replies: 226
Views: 10444

Re: Yarrb - redesigned

Just a thought, if you are going to have it assembled (at least the SMD parts) , wouldnt be a small FPGA more flexible ?
Having that said realizing that level shifting would be the next issue.
by bprosman
Tue Oct 15, 2019 8:22 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

Which GODIL do you have?
The 500's so I'm good anyway.
by bprosman
Tue Oct 15, 2019 7:35 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

Is the EEPizza board bigger (core wise) than the Godil Dave ?

Kind regards, Bram
by bprosman
Sun Oct 13, 2019 12:01 am
Forum: acorn atom and acorn system series
Topic: YARRB [SOLD OUT]
Replies: 287
Views: 24080

Re: YARRB [SOLD OUT]

What new toy.. ehh scope do you have Roland ?
by bprosman
Wed Oct 09, 2019 11:32 pm
Forum: acorn atom and acorn system series
Topic: A Website dedicated to the Acorn System Computers
Replies: 42
Views: 3291

Re: A Website dedicated to the Acorn System Computers

https://www.marktplaats.nl/q/19+inch+rack/
I have some 19" cases but shipping to the UK might be costly.
by bprosman
Wed Oct 09, 2019 9:04 pm
Forum: acorn atom and acorn system series
Topic: A Website dedicated to the Acorn System Computers
Replies: 42
Views: 3291

Re: A Website dedicated to the Acorn System Computers

Any other ideas where to get a eurocard frame welcomed!
In Holland they regularly appear on "Marktplaats" , a Dutch sort of eBay or one of the "Radio flea markets" that are there.
by bprosman
Fri Oct 04, 2019 7:58 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

Here you are :
z80_adapter_bom.pdf
(29.95 KiB) Downloaded 48 times
by bprosman
Fri Oct 04, 2019 6:37 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

Hi Dave,

Does this mean that in a system with static RAM it is (more) stable ?
In that case I can build the adapter and test it in my MPF-1B.

Kind regards, Bram
by bprosman
Fri Oct 04, 2019 2:59 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

And... we have a lift-off :-) The 6502 board works nice in an MPS-65 as well as in my Atom : http://retro.hansotten.nl/6502-sbc/msp-65-2-thaler/ On my board I did not fit the 3 single-signal level shifters , main reason, I did not have them :wink: Second reason , I never have used the trigger option...
by bprosman
Thu Oct 03, 2019 4:48 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

I can test in an MPF-1B.

Kind regards, Bram
by bprosman
Mon Sep 30, 2019 7:04 pm
Forum: acorn atom and acorn system series
Topic: ICE T65/Z80/6809
Replies: 960
Views: 87965

Re: ICE T65/Z80/6809

Boards came in today, hope to start building them tomorrow.
B0FFEB4B-BA6C-4F31-9FC3-C8F9E00ECA2B.jpeg
by bprosman
Mon Sep 30, 2019 12:02 pm
Forum: acorn atom and acorn system series
Topic: Acorn Atom Capacitors
Replies: 5
Views: 525

Re: Acorn Atom Capacitors

Some time ago I made an Acorn Atom parts-list including "Shopping list".
It also makes a distinction between a "Basic Atom" and an extended one.
Acorn Atom Partslist.pdf
(455.24 KiB) Downloaded 23 times
by bprosman
Sun Sep 29, 2019 9:03 pm
Forum: acorn atom and acorn system series
Topic: Replica Atom
Replies: 68
Views: 5184

Re: Replica Atom

Personally, staying as close to the original as you can get I would change (IC24) from a 2532 to a 2732 , IC 21 as well and for IC20 I would go for a 2764.

//Edit I would suggest targetting 27(C)64 and 27(C)32 devices.
Dave was typing faster than I was :-)
by bprosman
Sat Sep 28, 2019 9:12 pm
Forum: acorn atom and acorn system series
Topic: My new poorly Atom
Replies: 86
Views: 3237

Re: My new poorly Atom

Looked like an angled header without ejectors.
I would solder the original connector in and fix the damages traces with Kynar wire.
by bprosman
Fri Sep 27, 2019 8:11 pm
Forum: acorn atom and acorn system series
Topic: 3D print Acorn Atom case
Replies: 52
Views: 7499

Re: 3D print Acorn Atom case

a Laser Cut Acrylic case for the Atom?
Would be interested in that more than a 3D printed case, especially with a new keyboard.
Though Cherry switches and custom made key-caps might be still in the price range of a 2nd handed Rev.5 Atom.
by bprosman
Fri Sep 27, 2019 8:43 am
Forum: acorn atom and acorn system series
Topic: My new poorly Atom
Replies: 86
Views: 3237

Re: My new poorly Atom

Sound like time for Dave/Hoglets ICE-T65 :D
by bprosman
Thu Sep 26, 2019 9:05 pm
Forum: acorn atom and acorn system series
Topic: My new poorly Atom
Replies: 86
Views: 3237

Re: My new poorly Atom

if someone could point me to a an image of the main Atom ROM
acorn_roms.zip
(81.44 KiB) Downloaded 18 times
by bprosman
Thu Sep 26, 2019 10:47 am
Forum: acorn atom and acorn system series
Topic: Replica Atom
Replies: 68
Views: 5184

Re: Replica Atom

Initially am only going to order 5 boards; really just to see if they work I really would take Dave's (Hoglet) advice into consideration. I do understand you can use ROM's from another Atom but other beta testers (if you want them) would have a hard time getting the chips sourced. That would be a p...
by bprosman
Wed Sep 25, 2019 8:21 pm
Forum: acorn atom and acorn system series
Topic: Replica Atom
Replies: 68
Views: 5184

Re: Replica Atom

Nice piece of work.
I also got already quite far in Kicad some years ago but then it got down on my priority list.

Kind regards, Bram
Acorn Atom.pdf
(281.56 KiB) Downloaded 56 times
by bprosman
Wed Sep 25, 2019 6:03 pm
Forum: acorn atom and acorn system series
Topic: A slightly dog-eared Atom
Replies: 32
Views: 2265

Re: A slightly dog-eared Atom

Curious what paint you will use , personally I find it always tricky, paint on plastics.
by bprosman
Wed Sep 25, 2019 1:08 pm
Forum: acorn atom and acorn system series
Topic: Atom Video to HDMI Adapter
Replies: 264
Views: 18302

Re: Atom Video to HDMI Adapter

So I think plan B is to create a to-scale template from the pcb file and use that. Just checking no one created that before I start messing about in kicad.
Doesnt require much messing. Printing the Kicad Design is pretty well to scale on a laser or inkjet printer.
by bprosman
Tue Sep 24, 2019 5:05 pm
Forum: past physical ABug events
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 249
Views: 17902

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

Was good as usual. Thanks Jason and all. Only trouble with just doing Sunday only is it seems to be time to come home not long after getting there. Hopefully by the next one I will have the FPGA doing something more impressive than counting in a seven segment display. Looking into the FPGA magic as...
by bprosman
Sat Sep 21, 2019 12:35 am
Forum: acorn atom and acorn system series
Topic: just got two Atom's
Replies: 6
Views: 615

Re: just got two Atom's

Actually not sure how original you want to keep them but I would go for precision sockets everywhere.

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