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by Badwolf
Thu Mar 28, 2024 2:05 pm
Forum: HARDWARE DISCUSSIONS
Topic: 12V needed for ST?
Replies: 7
Views: 170

Re: 12V needed for ST?

Thanks all.

So my takeaway is that whilst 5V will let you boot to the desktop, whether you can *see* it depends on quite a few things.

So I think I'll stop recommending it as a troubleshooting shortcut without that nota bene.

Cheers,

BW.
by Badwolf
Thu Mar 28, 2024 11:18 am
Forum: HARDWARE DISCUSSIONS
Topic: Atari ST OPL3 cart schematics
Replies: 16
Views: 861

Re: Atari ST OPL3 cart schematics

@Badwolf I could prepare two versions with and without latches to see how everything behaves. But in the end I would like to have compatibility with faster machines too. Simpler version could be an option for people with standard machines (who know they will never, ever buy any accelerator ;-)). .....
by Badwolf
Thu Mar 28, 2024 11:02 am
Forum: HARDWARE DISCUSSIONS
Topic: 12V needed for ST?
Replies: 7
Views: 170

Re: 12V needed for ST?

For people who still use SCART 12V is also needed to generate the correct signals for TVs to recognize the picture. Is that just for the RGB/Composite switching? I think I've used SCART for colour with just 5V. BUT, MONO for the ST2VGA would still nee 12V as it powers the RGB/MONO IC. Aha. There's ...
by Badwolf
Wed Mar 27, 2024 10:04 pm
Forum: HARDWARE DISCUSSIONS
Topic: 12V needed for ST?
Replies: 7
Views: 170

12V needed for ST?

Really quick one. I didn't want to pollute another thread. I've seen it said a lot -- and I just saw RJ (I think) mention it on another thread -- that the 12V line isn't needed for the ST to boot. I thought this was true too but couldn't get anything out of either of my STs when relying on this. Tur...
by Badwolf
Wed Mar 27, 2024 9:57 pm
Forum: HARDWARE DISCUSSIONS
Topic: Atari ST OPL3 cart schematics
Replies: 16
Views: 861

Re: Atari ST OPL3 cart schematics

This is R/W timing: Tww - 100ns, Twds - 10ns Twdh - 20ns opl3Timing.png The only one there I think that matters is Tww of 100ns. If you drive it from a combination of ROM3 and A1 (if you want to identify chips with on A1, A2 etc.) then the minimum assertion time for an ST would be two clock cycles....
by Badwolf
Wed Mar 27, 2024 8:14 pm
Forum: NOOB QUESTIONS
Topic: Atari Falcon Schematic PCB layout
Replies: 1
Views: 108

Re: Atari Falcon Schematic PCB layout

Hi! I found the Atari Falcon030 Service Guide, but it is electronic oriented, and there are not all the PCB layout informations, like : where is the fan connector? Where is the sound connector? What is this switch for, and this one, etc? Any chance I could find a good pic of the PCB with all the ma...
by Badwolf
Wed Mar 27, 2024 7:49 pm
Forum: HARDWARE DISCUSSIONS
Topic: Atari ST OPL3 cart schematics
Replies: 16
Views: 861

Re: Atari ST OPL3 cart schematics

Sorry -- daughter's not been well today. Not really had time to read all this properly. Responding a bit ad-hoc. Need for this latch was purely to save state of adress lines to have certain pattern set on OPL3 data / address lines, after setting this I need to (assert /WR low or high OPL3 for certai...
by Badwolf
Tue Mar 26, 2024 8:41 pm
Forum: HARDWARE DISCUSSIONS
Topic: Atari ST OPL3 cart schematics
Replies: 16
Views: 861

Re: Atari ST OPL3 cart schematics

I think more experienced people will look at it the better. I've got already some feedback issues related to pcb, which I would like to address in next version. Currently I'm mostly worried about physical pcb and issues related to power connections and decoupling capacitors, so if you could take a ...
by Badwolf
Tue Mar 26, 2024 2:06 pm
Forum: HARDWARE DISCUSSIONS
Topic: Atari ST OPL3 cart schematics
Replies: 16
Views: 861

Re: Atari ST OPL3 cart schematics

I've made some changes to development pcb . I've shortened length a little and added pinouts for OPL3 interface hardware debugging.I hope to get some more feedback/review before I send it for manufacturing. I'd like to offer some help, but I'm not an audio guy and know little about what's needed on...
by Badwolf
Mon Mar 18, 2024 11:42 am
Forum: MEMBER BLOGS
Topic: LC III - Will it ever run?
Replies: 84
Views: 1946

Re: LC III - Will it ever run?

stephen_usher wrote: Sun Mar 17, 2024 1:55 pm We have a winnah! :-)
Well done!

BW

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