Search found 2568 matches

by oss003
Thu Jan 18, 2018 7:01 pm
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 40
Views: 1034

Re: My New Acorn Atom :)

That's good, the leds blink when reset goes low so your reset signal comes through without delay.
The only other thing I can think of is a delay on the IRQ signal. I read that you have a scope, can you check if there's a delay on the IRQ line ..... not the NMI.

Greetings
Kees
by oss003
Thu Jan 18, 2018 11:54 am
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 40
Views: 1034

Re: My New Acorn Atom :)

When are the leds on the AtoMMC blinking, at power on or after 12 sec?

Greetings
Kees
by oss003
Wed Jan 17, 2018 9:16 pm
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 40
Views: 1034

Re: My New Acorn Atom :)

Please check the 6502 pins for shortcuts or connections with the capacitor.

Greetings
Kees
by oss003
Wed Jan 17, 2018 7:14 am
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 40
Views: 1034

Re: My New Acorn Atom :)

Not really, normally a reset signal causes the AtoMMC to generate an IRQ signal. The Atom picks up the IRQ and jumps to #A000 to initialize the AtoMMC. This does not always work fine because the BREAK key bounces and generates multiple reset pulses. Every time the reset goes low, the AtoMMC is reset...
by oss003
Fri Jan 12, 2018 6:39 pm
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 40
Views: 1034

Re: My New Acorn Atom :)

Yes, that's the original design.
Please read primes note about the timing of the 123 and check that in the datasheets.

Greetings
Kees
by oss003
Fri Jan 12, 2018 7:15 am
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 40
Views: 1034

Re: My New Acorn Atom :)

Nice job Walter ..... let the gaming begin ..... =D>

The easiest way to add a noisekiller is this one: http://www.acornatom.nl/atom_nieuws/198 ... 853086.htm
It also replaces the video buffers with more common 74LS244 and 74LS245 chips.

Greetings
Kees
by oss003
Thu Jan 11, 2018 2:13 pm
Forum: introduce yourself
Topic: Hello!
Replies: 10
Views: 239

Re: Hello!

Hi Mike,

Welcome and enjoy the forum .....

Greetings
Kees
by oss003
Thu Jan 11, 2018 2:13 pm
Forum: introduce yourself
Topic: Hello!
Replies: 10
Views: 295

Re: Hello!

Hi Matt,

Welcome and enjoy the forum .....

Greetings
Kees
by oss003
Thu Jan 11, 2018 2:12 pm
Forum: introduce yourself
Topic: Hello from Portugal
Replies: 13
Views: 258

Re: Hello from Portugal

Hi Daniel,

Welcome and enjoy the forum ........

Greetings
Kees
by oss003
Sat Jan 06, 2018 5:50 pm
Forum: acorn atom
Topic: Floppy Days Podcast on the Acorn Atom
Replies: 4
Views: 133

Re: Floppy Days Podcast on the Acorn Atom

Hi Randy,

As posted in your previous post, I'm happy to help you with info about the Atom.
May be if you post your questions, people are willing to answer them.

Greetings
Kees
by oss003
Thu Jan 04, 2018 7:45 pm
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 40
Views: 1034

Re: My New Acorn Atom :)

Well done Walter,

welcome as a new Atom user ........... :)

Greetings
Kees
by oss003
Fri Dec 29, 2017 2:39 pm
Forum: introduce yourself
Topic: Hello!
Replies: 8
Views: 328

Re: Hello!

Hi John,

Welcome and enjoy the forum......

Greetings
Kees
by oss003
Mon Dec 25, 2017 10:05 am
Forum: software: games - high scores
Topic: Merry Christmas Gamers and all *.
Replies: 19
Views: 822

Re: Merry Christmas Gamers and all *.

Merry Christmas and the best wishes for 2018!!!!!
May it be a productive year .....

Greetings
Kees
by oss003
Sun Dec 17, 2017 8:37 pm
Forum: acorn atom
Topic: Atom user defined colours
Replies: 7
Views: 194

Re: Atom user defined colours

Yes , I mean extra registers to change the colourpalette values. I am not interested in other modes but inspired by the VideoNula topic, I just wondered if something like that is possible with the Godil colourpalette. All Atom games in colourmode, have a coloured background while most games in other...
by oss003
Sun Dec 17, 2017 7:40 pm
Forum: acorn atom
Topic: Atom user defined colours
Replies: 7
Views: 194

Re: Atom user defined colours

Sounds interesting ..... :)

I looked at the Godil code but how do you define extra addresses?

Greetings
Kees
by oss003
Sun Dec 17, 2017 7:30 pm
Forum: acorn atom
Topic: Atom user defined colours
Replies: 7
Views: 194

Re: Atom user defined colours

For the current hardware, you still can choose 1 out of 8 colours, right?
Is luminance also used?

Greetings
Kees
by oss003
Sun Dec 17, 2017 7:20 pm
Forum: acorn atom
Topic: Atom user defined colours
Replies: 7
Views: 194

Atom user defined colours

Hi guys, I was just wondering if it is possible to add user defined colours to the Godil. The colour palette is a constant array now but is it possible to add some addresses to the Godil to change the array values? The standard values must be restored after a BREAK. This way you can finally write ga...
by oss003
Sun Dec 10, 2017 11:00 am
Forum: acorn atom
Topic: Porting Atom under Risc OS
Replies: 6
Views: 443

Re: Porting Atom under Risc OS

It should be possible but Atom Basic is not as structured as BBC Basic. In the Basic #Cxxx ROM, there's one read at #B001 for reading the status of the ESCAPE key which is hardware depending and should be rewritten. Also not all Basic commands are in the Basic #Cxxx ROM, the commands PLOT, DRAW, MOV...
by oss003
Fri Dec 08, 2017 8:05 am
Forum: introduce yourself
Topic: Greetings!
Replies: 20
Views: 742

Re: Greetings!

Hi Darren,

welcome and enjoy the forum ....

Greetings
Kees
by oss003
Wed Dec 06, 2017 8:31 pm
Forum: introduce yourself
Topic: Introducing myself
Replies: 12
Views: 409

Re: Introducing myself

Hi Joe,

Welcome and enjoy the forum ...

Greetings
Kees
by oss003
Fri Dec 01, 2017 3:49 pm
Forum: acorn atom
Topic: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)
Replies: 23
Views: 843

Re: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)

Manual linking is soooooo 80's ... but if you like manual linking, it is ........ :D

Greetings
Kees
by oss003
Fri Dec 01, 2017 2:33 pm
Forum: acorn atom
Topic: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)
Replies: 23
Views: 843

Re: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)

sirmorris wrote:E000 AtoMMC requires a patched FP ROM.

For autobooting you need a patched Fxxx rom but you can manually boot the AtoMMC rom by linking to #EFC0.
The Floating Point patch is for BRAN, automatic ROM switching software.

Greetings
Kees
by oss003
Fri Dec 01, 2017 10:04 am
Forum: acorn atom
Topic: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)
Replies: 23
Views: 843

Re: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)

But if he did that wouldn't it preclude the use of SDDOS which IIRC is an $E000 ROM? SDDOS is an #Axxx rom so could be used instead of the DISATOM. SDDOS is a standalone rom so doesn't need the AtoMMC rom. You can use an #Exxx version of AtoMMC and an #Axxx version of SDDOS. This way you can direct...
by oss003
Fri Dec 01, 2017 7:10 am
Forum: acorn atom
Topic: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)
Replies: 23
Views: 843

Re: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)

No that doesn't work because the AtoMMC rom and DISATOM are both #Axxx versions.
You could install an #Exxx AtoMMC rom instead of a #Axxx version and place the AtoMMC rom on top.

Greetings
Kees
by oss003
Mon Nov 27, 2017 11:20 am
Forum: upcoming and recent events & exhibitions
Topic: Gauging Interest: ABug Manchester Friday 19th - Sunday 21st January 2018
Replies: 48
Views: 1750

Re: ABug Manchester Friday 19th - Sunday 21st January 2018

Looks like I can attent this one the whole weekend ........ :D
I'll only bring my laptop.

Greetings
Kees
by oss003
Sun Nov 26, 2017 5:39 pm
Forum: acorn atom
Topic: need Acorn Atom expert
Replies: 6
Views: 288

Re: need Acorn Atom expert

rkindig wrote:Am I able to PM any of those people?

Just ask the moderators ...... :) or post your questions in this topic.

Greetings
Kees
by oss003
Sun Nov 26, 2017 11:07 am
Forum: acorn atom
Topic: need Acorn Atom expert
Replies: 6
Views: 288

Re: need Acorn Atom expert

Hello rkindig, welcome to the forum and I'm happy to share information about the Atom with you. Maybe this list of Atomic expansions with link to the developers helps you: http://www.stardot.org.uk/forums/viewtopic.php?f=13&t=8168&p=86259&hilit=Acorn+atom+colourboard#p86259 Greetings Kees
by oss003
Sat Nov 25, 2017 9:10 am
Forum: acorn atom
Topic: Atom scrambled screen
Replies: 8
Views: 299

Re: Atom scrambled screen

Hello Dave,

welcome to the forum, maybe this link will help you: viewtopic.php?f=44&t=6318&p=60505&hilit=minimal+configuration#p60505

Greetings
Kees

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