Search found 203 matches

by PhilYoung
Sun Feb 22, 2015 12:45 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Fixed it. And of course it turned out to be something quite mundane. Reprogramming the CPLD to output the clock increasingly divided down on the RA12-RA16 pins worked, simplifying the VHDL to just echo A12-A15 to the outputs didn't. I then remembered to check that the inputs address lines were actua...
by PhilYoung
Thu Feb 19, 2015 6:30 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Phil, I have had problems with PLCC sockets, with the sprung pin getting bent slightly and not making contact with the IC. I would try checking continuity between the pin on the PLCC IC (using a fine needed to touch just the IC pin) and the pin on the RAM chip. I think there will be a break in this...
by PhilYoung
Thu Feb 19, 2015 11:55 am
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Roland, some results below. Hi Phil, This is a weird problem. I would think there is a problem with A12. Maybe you can test this signal with this program: P=#2000;[ STA #2100;JMP#2000;] A12 should be low all the time A12 at 6502 and 27256 both low as expected RA12 at 628128 high (incorrect) The same...
by PhilYoung
Wed Feb 18, 2015 5:29 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Thanks Roland, I'll try that tomorrow. It seems likely that A12/A13 on the RAM is the problem in some way. It looks from the schematic that A12 to A16 to the RAM are actually RA12-16 from the memory decoder CPLD. Only A14 on the EPROM comes from the CPLD (RA14) and this seems to be OK. I'll also che...
by PhilYoung
Wed Feb 18, 2015 3:01 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Hi, It looks like I spoke too soon. Once I got a keyboard interface working I was able to try running the programs from the Atom Archive, and rapidly discovered that there is a problem with my Dutch Atom and I'm a bit stumped. What is happening is that writes to (or possibly reads from) RAM are bein...
by PhilYoung
Mon Feb 16, 2015 4:15 pm
Forum: acorn atom and system
Topic: Designing a new Atom keyboard
Replies: 4
Views: 977

Re: Designing a new Atom keyboard

Hi Phil, I didn't want to print the switches and key caps. A set of keys and caps will cost about €60-€70. And that's for the Cherry keys we talked about in the main board thread. I have two samples of those keys and they are really nice (although also really expensive) keys. The caps are smaller t...
by PhilYoung
Sun Feb 15, 2015 11:39 am
Forum: acorn atom and system
Topic: Designing a new Atom keyboard
Replies: 4
Views: 977

Re: Designing a new Atom keyboard

There has been talk, maybe too much talk about the shortage of Atom keyboards. And housings too. Maybe we should just put the cat among the pigeons and start this project. I'm willing to investigate :mrgreen: Who on this forum has (access to) a 3D printer that can print an object of about 380 x 280...
by PhilYoung
Sat Feb 14, 2015 4:54 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Hi Phil, Nice job =D> I didn't even know that you already started building your new Atom. How did you connect the keyboard to your Atom? Today I received the first set of Mk2 boards and they eliminate the problems with cassette, audio and power connector. Cheers, Roland Thanks ! There was no proble...
by PhilYoung
Sat Feb 14, 2015 2:55 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Hi Phil Well I already have some (NOS) 7 pin DIN sockets that I hoped would fit: image.jpg image.jpg But as you can see, they have the wrong PCB pin-out. And of the three electronic part suppliers that I checked, they either did not stock them, or had the same pin-out as my my DIN sockets, or a com...
by PhilYoung
Sat Feb 14, 2015 2:04 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Another success for Rolands design Ooooh, with that distracting pussy picture, I forgot to say: Well done there Phil =D> =D> =D> BTW how did you get on getting hold of the DIN socket? Hopefully Roland has a "pretested" one for me... By the looks of it, everything else, connector wise is either okay...
by PhilYoung
Sat Feb 14, 2015 12:26 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Another success for Rolands design:
DSCF0039_rotated.jpg
Keyboard PS2 interface is in progress, my assistant is dealing with that:
DSCF0033_resized.jpg
Cheers,

Phil Young
by PhilYoung
Sun Feb 08, 2015 3:13 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

roland wrote:Wow ... lot's of posts to comment :shock:

@Phil: At the moment I don't know a cheaper source. I can ask around in the local shops if they still have some. The price of a pair is indeed quite high. Not lol.
Not to worry ! It's not like I have to buy a lot of them....

Cheers,

Phil
by PhilYoung
Sun Feb 08, 2015 10:51 am
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Thanks Wim, it's nice to hear that there is only a little difference. @Mark: I'm going to order a few components at Farnell. Do you want me to order a set of the 64p A/B connectors for you? I can ship them with the Godil when it arrives. Roland, Since you mention the 64-way Atom interface connector...
by PhilYoung
Sat Feb 07, 2015 11:01 am
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

Hi Roland Before you fit the CPLD's, connect a 5V power supply and check if the output of the LM3940 is about 3.3V. If it's to high for whatever reason, the CPLD's will get destroyed. The biggest problem is to get them out of their socket, that might get damaged and replacing the socket will be a he...
by PhilYoung
Wed Feb 04, 2015 7:48 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

multiwizard wrote:
Hi Phil, I took some close-up pictures... :)
Sneaky! Very creative. Mine isn't going to have to fit in an Atom case so I'll be able to use something more conventional,

Good luck when you power it up,

Cheers,

Phil
by PhilYoung
Wed Feb 04, 2015 5:56 pm
Forum: hardware
Topic: Building Rolands new Atom design...
Replies: 367
Views: 34916

Re: Building Rolands new Atom design...

And now modifying the rest of my Atom keyboard... :-k I can tell you it absolutely wasn't easy to do it this way but it worked out fine... :D Hi, What sort of connector have you used for the GODIL test/VGA and audio out, looks like it is out of the GODIL footprint on the penultimate photo, Good eff...
by PhilYoung
Sat Jan 10, 2015 11:14 am
Forum: past events & exhibitions
Topic: Acorn & BBC User Group (ABug) NORTH 31 Jan HALIFAX
Replies: 165
Views: 24964

Re: Acorn & BBC User Group (ABug) NORTH 31 Jan HALIFAX

danielj wrote:No problem - 4 left.

Ian, if I don't manage to build it beforehand, I'll build it there!

d.
Are you willing to stick one in a jiffy bag and post it ? If so I'd like one if you can let me know the inclusive price,

Cheers,

Phil Young
by PhilYoung
Thu Jan 08, 2015 8:44 pm
Forum: for sale / freebies
Topic: FS: New Atom Main Board
Replies: 24
Views: 3620

Re: FS: New Atom Main Board

Yes, the second batch will have some changes, like the two mmc lines (mosi and miso are swapped), the pic is now connected to 3.3 V and another few minor improvements. Could you list the Mk1 board corrections for me please, so I'll be able to get it going. I forgot to ask, does your board take the ...
by PhilYoung
Thu Jan 08, 2015 1:29 pm
Forum: for sale / freebies
Topic: FS: New Atom Main Board
Replies: 24
Views: 3620

Re: FS: New Atom Main Board

Hi Phil, Of course I can supply a kit without a GODIL. As a matter of fact I don't have a big box full of GODILS over here, so I have to order them when I sell one. I'll ask Wim and Kees which components they need and I'll order and prepare a kit for you. If somebody else is interested, please let ...
by PhilYoung
Thu Jan 08, 2015 9:52 am
Forum: for sale / freebies
Topic: FS: New Atom Main Board
Replies: 24
Views: 3620

Re: FS: New Atom Main Board

Hi Roland,

I'd be interested in that if I could have an otherwise complete kit without the GODIL. I have one of these but have never had the nerve to install it into my real (and fragile) Atom.

Let me know if that is okay,

Cheers,

Phil Young
by PhilYoung
Tue Dec 30, 2014 1:40 pm
Forum: acorn atom and system
Topic: Designing a new Atom main board
Replies: 668
Views: 59369

Re: Designing a new Atom main board

Just discovered something that might give the experts a clue: As you know, *CAT hangs. BUT: if I remove the SD card, press BREAK, and then re-insert the SD card, *CAT works. I can CWD into different directories, no problem. And this works until I press break again. Something worth noticing: my rese...
by PhilYoung
Wed Dec 10, 2014 11:54 am
Forum: acorn atom and system
Topic: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 1214
Views: 132555

Re: Matchbox sized 6502 / Z80 / 6809 Co Pro

Hi, [Could well be. I haven't investigated too deeply into the BIOS/BDOS part of the 80x86 CoPro (DOS disk system layer that sits on top of the Tube system). I've actually got the Acorn source code for the Tube client, and the coding and commenting style is horrendous. The source code is showing up ...
by PhilYoung
Wed Dec 10, 2014 9:15 am
Forum: archive requests
Topic: Topologika Adventures
Replies: 123
Views: 19224

Re: Topologika Adventures

Hi, The 2 eBay listings at the moment for AVON and RETURN TO DOOM are great evidence of official release status for the BBC B, B+ and MASTER. Do we have any more "evidence" of other releases? Thanks, Lee. I have physical copies of 'Philosopher's Quest' and 'Countdown to Doom' (both Topologika 1987)...
by PhilYoung
Thu Nov 27, 2014 8:48 am
Forum: for sale / freebies
Topic: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 603
Views: 75534

Re: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro

Hi,

I would like the 'B' external memory option, please.

Cheers,

Phil Young
by PhilYoung
Mon Nov 24, 2014 12:17 pm
Forum: for sale / freebies
Topic: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 603
Views: 75534

Re: Matchbox sized 6502 / Z80 / 6809 Co Pro

And another for the list, please,

Cheers,

Phil Young
by PhilYoung
Tue Nov 04, 2014 4:56 pm
Forum: acorn atom and system
Topic: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 1214
Views: 132555

Re: Matchbox sized 6502 Co Processor

Hi, The only part of Z80 second processor has that I haven't yet implemented is the "Desynchronizing Logic", described in the section 5.9 of service manual: http://chrisacorns.computinghistory.org.uk/docs/Acorn/Manuals/Acorn_Z802ndprocSM.pdf Thanks for that link, I hadn't seen that for some reason. ...
by PhilYoung
Wed Oct 15, 2014 10:09 am
Forum: acorn atom and system
Topic: AtoMMC and random access files
Replies: 239
Views: 21434

Re: AtoMMC and random access files

Hi Kees, Could the PIC code be published at all ? Obviously that is up to the Authors but might be useful for people to have a look at. People who can follow that code that is, which doesn't include me. Ideally on Hoglet's git repository (or similar) so that we are all reading from the same page. Th...
by PhilYoung
Wed Oct 15, 2014 7:40 am
Forum: acorn atom and system
Topic: AtoMMC and random access files
Replies: 239
Views: 21434

Re: AtoMMC and random access files

Hi, Hi guys, the option to have 3 open files is ok with me. Can't remember programs that open more than 2 files simultaneously. I think 2 would be the minimum useful (so you can open one file, process it and pipe the results to the second file), 3 would be better of course (50% better I suppose). We...
by PhilYoung
Wed Aug 06, 2014 7:14 am
Forum: hardware
Topic: Tube ULA Reverse Engineering
Replies: 128
Views: 21100

Re: Tube ULA Reverse Engineering

Hi Phil, Maybe you could see if there has been any more progress with this: http://visual6502.org/wiki/index.php?title=Acorn That page was last edited over three years ago. Who would know the latest status? Mark H., do you what happened to the samples you donated? Did you ever see any die photos? D...
by PhilYoung
Tue Aug 05, 2014 9:40 pm
Forum: hardware
Topic: Tube ULA Reverse Engineering
Replies: 128
Views: 21100

Re: Tube ULA Reverse Engineering

Hi,

Maybe you could see if there has been any more progress with this:

http://visual6502.org/wiki/index.php?title=Acorn

Cheers,

Phil Young