Search found 2635 matches

by Prime
Tue Jan 22, 2019 8:51 pm
Forum: acorn atom and system
Topic: System Clone design files....
Replies: 1
Views: 62

System Clone design files....

Hi all since I have been asked about these : Here's the Eagle design files for the following : 6502 clone board, Video board combination of the 40 and 80 column boards, switchable between the two. Backplane board. Floppy / Econet board, 8271 based, Econet is implemented by a Master / Arch Econet mod...
by Prime
Tue Jan 22, 2019 8:44 pm
Forum: development tools
Topic: Looking for a 6502 disassembler for reverse engineering
Replies: 18
Views: 477

Re: Looking for a 6502 disassembler for reverse engineering

I think there may be a bug with 1.20 where it is not loading the symbols correctly.

Please standby for a fix.....

Cheers.

Phill.
by Prime
Mon Jan 21, 2019 9:54 pm
Forum: development tools
Topic: Looking for a 6502 disassembler for reverse engineering
Replies: 18
Views: 477

Re: Looking for a 6502 disassembler for reverse engineering

jms2 wrote:
Mon Jan 21, 2019 8:58 pm
What am I missing?
Can you show us the contents of your LABELS.TXT please?

Cheers.

Phill.
by Prime
Sun Jan 20, 2019 6:28 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD
Replies: 122
Views: 4524

Re: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD

And home....

Thanks to Robert for organising the meetup in such a good venue (again), and thanks to all that came and made it an enjoyable and productive meetup.

Cheers.

Phill.
by Prime
Fri Jan 18, 2019 12:08 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD
Replies: 122
Views: 4524

Re: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD

Right just setting out see you all in a couple of hours....

Phill.
by Prime
Fri Jan 18, 2019 12:21 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD
Replies: 122
Views: 4524

Re: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD

Right (hopefully) everything is packed up and waiting to be loaded into car tomorrow.

Hoping to leave Coventry at around mid-day so hopefully be there between 2-3pm depending on traffic etc.

Cheers.

Phill.
by Prime
Wed Jan 16, 2019 11:04 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

oss003 wrote:
Wed Jan 16, 2019 8:47 pm
Nice job Phill, looks great....👏
Did you also test colours in textmode and in colourset2?
?#B002=8
Yep I believe your Manic Miner screen uses them and displays OK but will check.

Cheers.

Phill.
by Prime
Wed Jan 16, 2019 6:25 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

Right I think I've got the colours working correctly now :
P1000111.JPG
8 Colour test.
And Mono mode looks good too.....
P1000112.JPG
Mono mode....
Cheers.

Phill.
by Prime
Tue Jan 15, 2019 7:47 pm
Forum: hardware
Topic: New ROM / RAM Expansion Board for BBC B
Replies: 26
Views: 546

Re: New ROM / RAM Expansion Board for BBC B

I use SIL pins and a stack of sockets... effective and not entirely ugly :lol: Exactly what I do for my boards using these : https://www.rapidonline.com/truconnect-20-way-turned-pin-sil-header-22-1704 Bonus is they are 20 pin so 2 of them and a 40 pin socket for the CPU / 6847 (on the Atom) etc. Ch...
by Prime
Tue Jan 15, 2019 9:27 am
Forum: hardware
Topic: New ROM / RAM Expansion Board for BBC B
Replies: 26
Views: 546

Re: New ROM / RAM Expansion Board for BBC B

PCB design is almost complete, and I will be looking to place an order for a prototype PCB in the very near future. One off costs are quite high, but come down considerably if I order in bulk. Might be worth considdering https://www.allpcb.com they are quite reasonable for runs of 5 boards, it woul...
by Prime
Sun Jan 13, 2019 4:09 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

was the Mk 5.1 board the only version with this Issue at the "Cowboy shoot out" game? Hi Wim, It was the only version it was reported on, I think you have one of the late 4.x series (which became the 5.x), so yours may have the problem :) I think your board is the one that has an LS chip on the out...
by Prime
Sat Jan 12, 2019 9:58 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

OK, I'll try that. I've been trying to follow the details of the v5.4 board to understand how it improves on previous versions, but I must admit the details eluded me! In a nutshell, is the main benefit improved ease of manufacture, or does it do other things such as give more faithful colours? I'm...
by Prime
Sat Jan 12, 2019 8:23 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

Phill, I know you were never able to reproduce the screen rolling instability problem with version 5.1, but is there reason to believe that the new version 5.4 might perform better in that regard? Well, I was able to reproduce the problem with "Cowboy shoot out", this board doesn't seem to have it....
by Prime
Sat Jan 12, 2019 6:41 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

Gotta say I'm impressed with all-pcb, ordered these Monday 7th Jan, arrived Friday 11th Jan, including the journey from China! Anyway here's the Mk 5.4 board seems to be working so far (this is the second one built), which Kees has kindly aggreed to test for me. P1000104.JPG I'm not currently using ...
by Prime
Thu Jan 10, 2019 4:32 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD
Replies: 122
Views: 4524

Re: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD

The PSU probably does need recapping, they often have Rifas in like beeb PSUs, I seem to remember doing one for someone last time I was at camberly. I'll bring my box of RIFAs..... Can't remember if the IIe has it's chips socketed, but if so might be worth re-seating them. Though I suspect from the ...
by Prime
Thu Jan 10, 2019 9:30 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD
Replies: 122
Views: 4524

Re: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD

Will also bring my Wellon programmer, will try to (remember to) pack my Stag eraser (can do about 7 at a time).

Anything else anyone wants me to bring?

Cheers.

Phill.
by Prime
Mon Jan 07, 2019 6:58 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

I'll hopefully have the boards by the meetup, I ordered 5 today from ALL-PCB. With any luck I should have at least one built :) I've also recieved some of the slightly bigger 74HCT1G66s from Mouser these : https://www.mouser.co.uk/ProductDetail/595-SN74LVC1G66DBVR Whilst they are still small they at...
by Prime
Sun Jan 06, 2019 7:38 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

Right, next stage is complete, prototyping new board, on self etched board :- P1000087.JPG Seems to be working fine now, though it's taken a few days for me to track down a bug that was caused by A0 being connected properly to the 6847 but not (reliably) to the Atom Bus :( leading to odd results whe...
by Prime
Sun Jan 06, 2019 7:29 pm
Forum: acorn atom and system
Topic: Big Benny: a real time clock for the Atom
Replies: 9
Views: 335

Re: Big Benny: a real time clock for the Atom

I have one of those that I believe Kees gave me at one of the Acorn meetups in the Las in Manchester, so was a few years ago :) Never had it working tho, will have to try it at some point. It should be possible to have the AtoMMC and the Big Benny on the same PL8 cable, AtoMMC now only uses 4 I/O lo...
by Prime
Fri Jan 04, 2019 10:46 pm
Forum: programming
Topic: MINGW misery
Replies: 12
Views: 312

Re: MINGW misery

I've had problems sometimes building things in my Dropbox folder, basically dropbox is doing things in the background that fubars the foreground process.

Cheers.

Phill.
by Prime
Fri Jan 04, 2019 3:32 pm
Forum: off-topic
Topic: What New Language Should I Learn?
Replies: 21
Views: 352

Re: What New Language Should I Learn?

If you have braces/language syntax for that and indentation as a second way of expressing the same thing you can then check they match! Which is presisely why I tend to use : if (blah == 1) { DoSomething(); DoSomethingElse(); } Rather than : if (blah == 1) { DoSomething(); DoSomethingElse(); } Beca...
by Prime
Wed Jan 02, 2019 7:18 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

I love the dead-bug mounting of the 74LVC1G66 - it really is rather a pig to solder. Not really a dead bug mounting, I made some little adapter boards, though I did use the wrong footprint for the damn chip....gonna order some more of the bigger footprint ones to try, as Mouser carry them. Are you ...
by Prime
Wed Jan 02, 2019 6:22 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

So I was initially just working on a section of breadboard, but decided that wasn't a very long term solution....... So Now I have this on a little pice of stripboard plugged into the MK5.1 where the Colour VR would normally be, having first removed the Colour & Mono pots & resistors. Things to note...
by Prime
Mon Dec 31, 2018 10:58 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

Aha! Found the problem, I was feeding the Y signal into the pad that the emitter for TR2 would be connected to, however I had failed to notice / disconnect R6 a 470R also connected to that pin. So I guess that was pulling Y down, and stopping the other circuitry work :) Mind I've also now got a 74LV...
by Prime
Sun Dec 30, 2018 11:19 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

Phill, Question is the clamp signal meant to be active (high, therefore switching the 74LVC1G66 / 4016 on), during the back porch? Yes, the clamp signal should be active high during the back porch, and active for as long as possible. (i.e. it should go high just after that start of the back porch, ...
by Prime
Sun Dec 30, 2018 10:12 pm
Forum: acorn atom and system
Topic: Atom Disk manager
Replies: 8
Views: 210

Re: Atom Disk manager

Hi all,

I've just updated the executable to be 32bit, and made the project to default to windows / i386, as it doesn't really need 64 bit :)

I also added the ability to use -a to specify an Atom / System disk, so that you don't have to manually specify the qualifier all the time.

Cheers.

Phill.
by Prime
Sun Dec 30, 2018 9:12 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

I can't get this to work :( Replicating the Input to the Y comparitor C1, R1, R8, R9, RV1, C7. Also replicated the clamp circuit R6, R7, C4, I don't have any of the LVC gates but I did have a 4016, which according to it's datasheet is good down to 3V so I used that. Anyway I can't get any meaningful...
by Prime
Fri Dec 28, 2018 11:52 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 209
Views: 30316

Re: Atom Colour Board Thread

Right I've patched the mk5.1 board to take input from PL4 pin 9, and changed the CPLD so it only takes input from one comparitor. I've also changed the resistors so that the adjust produces sensible output and I get text fine :) I've also updated the CPLD code to generate the back portch clamp signa...
by Prime
Fri Dec 28, 2018 4:45 pm
Forum: acorn atom and system
Topic: Atom Disk manager
Replies: 8
Views: 210

Re: Atom Disk manager

OK DFSdisk updated now to delete files.

I've also included the exe in the github archive so you don't have to self compile (on windows at least).

Cheers.

Phill.
by Prime
Fri Dec 28, 2018 3:20 pm
Forum: acorn atom and system
Topic: Atom Disk manager
Replies: 8
Views: 210

Re: Atom Disk manager

Hi guys, does anyone know if there's a command line tool to add/delete files to an Atom diskimage? Atomdisk is 40 tracks, 10 sectors/track, 256 bytes/sector. For What platform? Windows / Linux / Mac / RiscOS / Atom ???? If you can compile freepascal, you could try my DFSDisk : Source available here...