Search found 774 matches

by Godzil
Mon Nov 23, 2020 1:14 pm
Forum: General Discussion
Topic: Oric cleaning :)
Replies: 12
Views: 2844

Re: Oric cleaning :)

Hmmm Ok didn't thought as "discolouration" as in loosing colour, misread there. Though if the plastic really get discoloured (the pigment loose their colour) the plastic will whiten, don't really see what could be done against that, there is no magic spray/process that could give its original colour...
by Godzil
Mon Nov 23, 2020 2:10 am
Forum: General Discussion
Topic: Oric cleaning :)
Replies: 12
Views: 2844

Re: Oric cleaning :)

My last Atmos was quite discoloured (case bottom and red keys), and this magic spray made everything back to its original glory. You can give the retrobright method a try if you want to make yellowed plastics white again, but this process is not everlasting and you'll have to repeat it after 2-3 ye...
by Godzil
Sun Nov 22, 2020 12:09 am
Forum: General Discussion
Topic: Blue Oric 1
Replies: 13
Views: 13830

Re: Blue Oric 1

I’m surprised I never posted that here: DB3D2566-9A16-4A5E-B012-0E998920A9D8.jpeg That's the mother board of the Tandata TD1616 that I got years ago now. I suspect this model to be older than the TD1000 Silicium.org have. The TD1000 clearly have support for the Rockwell 6501 (a microcontroller versi...
by Godzil
Sun Nov 08, 2020 2:57 pm
Forum: Technical questions
Topic: Atmos excessive buzzing from speaker
Replies: 18
Views: 3516

Re: Atmos excessive buzzing from speaker

My hears are working fine, thanks for the concern. Easy, no Oric I have here have a relay making any audible noises, and can't also be picked by a microphone put just on top of the chip. (and they are working) I've also recorded directly from the HP the noise both from a 1 and an Atmos, and the "hig...
by Godzil
Sat Nov 07, 2020 4:35 pm
Forum: Technical questions
Topic: New Oric Project. The OriClone-1
Replies: 25
Views: 6343

Re: New Oric Project. The OriClone-1

The idea for changing the connector is mostly to make sure you don't put a usual 9v supply on the machine. And that's probably a good idea, the 7905/7805 at least allow to "blow" as a fuse if you put something wrong on the barrel jack (like inverted polarity or really wrong voltage. Completely bypa...
by Godzil
Sat Nov 07, 2020 4:24 pm
Forum: Technical questions
Topic: Atmos excessive buzzing from speaker
Replies: 18
Views: 3516

Re: Atmos excessive buzzing from speaker

Orices are well known to chant the activity on the Data/Address bus. If you look at PCB, you will see that the audio out track of the AY-3-8910 is crossing both data and address bus. As it is before the amplification stage, the noise ig get from these is amplified, and ending in the main HP noises. ...
by Godzil
Fri Nov 06, 2020 7:46 pm
Forum: Technical questions
Topic: New Oric Project. The OriClone-1
Replies: 25
Views: 6343

Re: New Oric Project. The OriClone-1

Using the 7905 was a mistake, especially because using a 7805 would have not created any issue. I really think that the choice of the 7905 was more for $$ than anything else Incorrect, at least, according to official answers and data. :) The reason for the choice of 7905 over the 7805 was the lower...
by Godzil
Thu Nov 05, 2020 1:17 am
Forum: Hardware hacks and extensions
Topic: Expansion port for external ROM and /ROMDIS line
Replies: 12
Views: 1889

Re: Expansion port for external ROM and /ROMDIS line

And I got is fooled again. The output from the 6522 and ETL do not match.

NMOS:

Vih = +2.4 to 5V
Vil = -0.3V to 0.4V
Voh = 2.4V
Vol = 0.4V

(Vih = Input High, Vil = Input Low, Voh = Output High, Vol = Output low)

Can't find the proper transition voltage as it is not said in the datasheet.
by Godzil
Thu Nov 05, 2020 12:12 am
Forum: Hardware hacks and extensions
Topic: Expansion port for external ROM and /ROMDIS line
Replies: 12
Views: 1889

Re: Expansion port for external ROM and /ROMDIS line

One important point, the original 6522 is NMOS and don't work well with modern signal level. 3.3V for example will not work with some of them (I got caught by that on one of my project) : Chart-IC-Voltage-Switching-Levels-Grpah.png The minimum is the theorical minimum, so even a chip supposed to giv...
by Godzil
Wed Nov 04, 2020 11:46 pm
Forum: Technical questions
Topic: ULA versions
Replies: 15
Views: 4304

Re: ULA versions

What about the ones with just two lines PHILIPPINES HCS10017 without any other batch information, do we know where they come from, and if they actually work? Probably remarked by some chinese? Where does these come from? Are they working? Could you also add to my spreadsheet? (even if not tested ag...
by Godzil
Wed Nov 04, 2020 11:36 pm
Forum: Technical questions
Topic: New Oric Project. The OriClone-1
Replies: 25
Views: 6343

Re: New Oric Project. The OriClone-1

Hello forum! Firstly, I'm newly joined up here and haven't messaged before so I apologise in advance for any fluff-ups I may make. Now, I've been playing around with Oric's since I was a nipper just last week decided to make myself a new one based roughly on Manoel Trapier's excellent schematic. Ha...
by Godzil
Tue Apr 30, 2019 7:55 pm
Forum: General Discussion
Topic: Oric logo and trademark
Replies: 41
Views: 22086

Re: Oric logo and trademark

they also have registered logo for Jet Set Radio and Manic Miner which still clearly owned by its author and editor. You mean "Jet Set Willy" I guess. If it's Jet Set Radio, that would be cool, because then we could unleash the wrath of Sega on them :) :oops: :oops: :oops: :oops: :oops: :oops: Yes ...
by Godzil
Tue Apr 30, 2019 8:52 am
Forum: General Discussion
Topic: Oric logo and trademark
Replies: 41
Views: 22086

Re: Oric logo and trademark

The last link is u fortunately related. Same people behind. Lots of logos trademarked, sorry but that’s concerning. I have no confidence in Paul Andrews being “better” than his friends of the ZX Vega and the C64 mini scams. Oh and they just registered these logo (end of 2018) so they are not about t...
by Godzil
Mon Apr 29, 2019 9:22 pm
Forum: General Discussion
Topic: Oric logo and trademark
Replies: 41
Views: 22086

Oric logo and trademark

Does anyone in the Oric community is aware of that: https://trademarks.ipo.gov.uk/ipo-tmcase/page/Results/1/UK00003306145 Registered by Paul Andrews under one of his company (Andrews UK Limited) but probably for his other company Retrogames LTD: https://beta.companieshouse.gov.uk/company/09745704 Co...
by Godzil
Mon Apr 29, 2019 8:18 pm
Forum: Technical questions
Topic: Oric-1 Repair
Replies: 44
Views: 22894

Re: Oric-1 Repair

1) Powered it with a totally inappropriate adapter (AC output, wrong polarity, 12V or even higher etc). The only thing that may die here is the 7905 and yet; they are quite robust. Never manage to kill one even with reverse polarity. The second point is more likely (the power jack in the ext connec...