Search found 43 matches

by SpaceFlightOrange
Wed Jul 01, 2020 12:57 am
Forum: Hardware hacks and extensions
Topic: IJK-egoist new joystick interface by [raxiss]
Replies: 37
Views: 3477

Re: IJK-egoist new joystick interface by [raxiss]

Looks Awesome!

When will they be available to buy and if possible could i reserve a red one for the Atmos please?

Thanks
by SpaceFlightOrange
Fri May 01, 2020 11:28 pm
Forum: Technical questions
Topic: Atmos excessive buzzing from speaker
Replies: 8
Views: 796

Re: Atmos excessive buzzing from speaker

I had the same problem, but after recapping my Atmos, everything went back to normal. I think the capacitor concerned is the C1 near the ULA chip (mine was 16V 220µf). The bottom was cracked and it had started to leak. It's worth trying it, as you only need to change 3 caps (C1, C8 and C21)... Chee...
by SpaceFlightOrange
Fri May 01, 2020 12:47 am
Forum: Technical questions
Topic: Atmos excessive buzzing from speaker
Replies: 8
Views: 796

Re: Atmos excessive buzzing from speaker

What kind of buzzing? Like 50Hz mains hum (poorly smoothed power supply)? Or other frequency? Do you mean the purring of a happy Oric, but louder? :) Also, what do you have connected to the cassette port, as unwanted signals going into pins 4,5 (the non-cassette I/O pins) will be amplified and spat...
by SpaceFlightOrange
Thu Apr 30, 2020 3:27 pm
Forum: Technical questions
Topic: Atmos excessive buzzing from speaker
Replies: 8
Views: 796

Atmos excessive buzzing from speaker

Hi. I haven't been on here in a while, sorry, been on other projects, and haven't used the Atmos since fixing it mainly because i had no software and hadn't gotten around to making the appropriate lead to load tap files from ISS's excellent Android loader app. Anyway, I ordered an Erebus from Steve ...
by SpaceFlightOrange
Sun Dec 15, 2019 8:08 pm
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

[You may indeed have a reset issue, check/replace the capacitor C21 (1uF/10V) -- or next time it "hangs", manually short CPU/6502 Pin 40 to Ground (CPU Pin 1 or 21) with a short wire -- just dab on and let go, if it then resets, the reset is definitely not holding in the reset state long enough for...
by SpaceFlightOrange
Sun Dec 15, 2019 11:30 am
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

Hi. Further update. I made up some loopback connectors to run the full suite of tests from the diagnostic ROM. TL;DR They all passed but I observed some odd behaviour. The loopbacks I made for the printer and keyboard were not using the standard connectors as I didn't have those available, so I used...
by SpaceFlightOrange
Sun Dec 08, 2019 11:47 am
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

signal-2019-12-08-085024.jpeg Thank You, and, Goodnight :D RAM arrived from Bulgaria (Finally) NOS Fujitsu MB8264-15. It's been sitting there for a few days to be honest, but I was trying to get the Spectrum refurb done, but the keyboard was giving me some grief (its in a Lo>>Profile Keyboard case,...
by SpaceFlightOrange
Thu Dec 05, 2019 11:00 am
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

Imo, there seems to be little or no quality-control in operation from most of these cheap Chinese component manufacturers. So has Phil used to say on HSB, "let's be careful out there." I think you’re right. Best guess the ram I have is because they all appear to work they can’t be managing the adve...
by SpaceFlightOrange
Tue Dec 03, 2019 1:51 pm
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

Thanks mike. I’ll get on that while I’m waiting.

I did check the dram lines when I socketed them but I didn’t check from the multiplexer to the ULA. But I’ll go back over everything.
by SpaceFlightOrange
Mon Dec 02, 2019 12:30 am
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

That's when this happens you are glad you spent the time installing sockets instead of soldering directly the new chips :D 100% agree. That goes double when you venture into removing the PSG, VIA and CPU! +1 here. I was fully expecting to go down the road of removing the CPU, VIA and PSG, but hopef...
by SpaceFlightOrange
Mon Dec 02, 2019 12:25 am
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

Sorry for the delayed reply, I’ve been on shift this morning and repairing a Spectrum this afternoon and having considerably more success :lol: With the DRAMArduino (I'm not familiar with it), make sure you're testing the chip at the right "speed", because if the DRAM chip is slower than needed, it ...
by SpaceFlightOrange
Sun Dec 01, 2019 2:09 am
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

Sounds right to me, so does that mean the CPU, VIA, and AY are ok? This is also hooked up to my Bench PSU and I can see that the Atmos is drawing 700 milliamps. Yes, this is the correct sound and it means 99.99% CPU,VIA and AY are OK (diag EPROM too, obviously :)). So the only suspect is the RAM, u...
by SpaceFlightOrange
Sat Nov 30, 2019 9:21 pm
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

Ok, So.

A0 & A1 are like this (Pulsing):
A1.jpg
A1.jpg (133.13 KiB) Viewed 2903 times
A2 is like this:
A2.jpg
A2.jpg (118.79 KiB) Viewed 2903 times
and A3 is like this:
A3.jpg
A3.jpg (138.21 KiB) Viewed 2903 times
A4-A7 are low and A8=A15 are all high.

So it looks like it completed the first test and failed on the full test.
by SpaceFlightOrange
Sat Nov 30, 2019 8:58 pm
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

Yes, this is the correct sound and it means 99.99% CPU,VIA and AY are OK (diag EPROM too, obviously :)). So the only suspect is the RAM, until it arrives you can try DRAMARDUINO to test your chips. And I think 700 mA is bit higher ... Wow! that's so cool. I don't have an Uno, but I do have a Nano, ...
by SpaceFlightOrange
Sat Nov 30, 2019 7:26 pm
Forum: Technical questions
Topic: New Member and New Oric Atmos Owner
Replies: 72
Views: 14480

Re: New Member and New Oric Atmos Owner

What does your scope/probe show is happening on the address bus after boot? If you have DRAM read-write issues, this will definitely die at "ERR_RAM_QUICK" (a JMP loop to itself, placed so that the addresses will cycle as described above). Thanks for the really quick reply. Sorry for not giving any...