New Oric Project. The OriClone-1

If you want to ask questions about how the machine works, peculiar details, the differences between models, here it is !
How to program the oric hardware (VIA, FDC, ...) is also welcome.
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Dbug
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Re: New Oric Project. The OriClone-1

Post by Dbug »

Naive question: If you remove the 7905 and change the connector, could you power an Oric from a micro-usb or usb-c mobile phone charger?

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iss
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Re: New Oric Project. The OriClone-1

Post by iss »

Dbug wrote:
Fri Nov 06, 2020 8:24 pm
... could you power an Oric from a mobile phone charger?
Yes, and it works fine. But why to change the connector?

This is what I've done for OricExos

Image

You need to short this two holes with piece of thick wire:
pcb-1.jpg
And you can use any universal phone charger (output 5V and >600mA) with simple cable USB-to-barrel-jack:
20201106_221757.jpg

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Dbug
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Re: New Oric Project. The OriClone-1

Post by Dbug »

The idea for changing the connector is mostly to make sure you don't put a usual 9v supply on the machine.

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Re: New Oric Project. The OriClone-1

Post by Godzil »

Dbug wrote:
Sat Nov 07, 2020 7:18 am
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 bypassing is without a connector that warranty no other thing than 5V is probably not a good idea.

I would probably for for a USB-B plug as there is little chance to get anything else than 5V from there.

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Re: New Oric Project. The OriClone-1

Post by mikeb »

LM7905: At 1A 1.1V (demanding at least 6.1v at input)
LM7805: At 1A 2.0V (demanding at least 7.0v at input)
Godzil wrote:
Fri Nov 06, 2020 7:46 pm

In fact is it probably more easy to find a 7V power supply than a 6.1V

And yeah all official power supply were 9V:

So that does not really hold up.
I'm aware the original power supply was nominally 9V. You need to look closely at the word "nominally" there (they were unregulated supplies, it will be higher off load, will be lower when loaded with an Oric, and peripherals, and if the mains voltage is at bottom tolerance or below etc.)

No-one proposed a 6.1v power supply, or a 7V one. You've missed the point of the "at least" in those statements. You need some headroom.

"Allegations of cheapness" doesn't even come into making a decision to use a power supply *at* the lowest limit possible. That's just awful design.

It does hold up. And like the 5V rail, it holds up better the lower the dropout voltage on the regulator! (Haha!)

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Re: New Oric Project. The OriClone-1

Post by DigitalDunc »

On the subject of using 5V USB power, I see exactly three problems. It's not much of one but it is relevant.

1) USB calls for a minimum of 4.4V which is below requirements.
2) USB only guarantees 500mA unless you have a charger (the most likely route to power)
3) You're supposed to negotiate for most of that power, but that's not really an issue in most cases.

I say, go for it but make sure you choose your phone source with a skeptical eye and avoid those Cheap Chinese Pink Charger (tm) thingies.

As for my project status, somewhat stalled due to work commitments :( (and other home issues) but I'm placing an order for boards next weekend! :D They usually arrive reasonably quickly but I hear the ports are starting to back up this time so fingers crossed.

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Re: New Oric Project. The OriClone-1

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Re: New Oric Project. The OriClone-1

Post by DigitalDunc »

ibisum wrote:
Sat Nov 21, 2020 9:21 pm
Seen Exos?

https://forum.defence-force.org/viewtop ... =21&t=1880
I have, and it looks really exciting! I don't think there's enough Oric's to go around for everyone to have one though. It get's the grey matter all overheated considering the possibilities.

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Re: New Oric Project. The OriClone-1

Post by ibisum »

I mean, if there is to be a next-Gen Oric design, having multi-core Oric's doing video interlacing seems kind of intrinsic .. not suggesting anyone butcher their Oric's to build one, but certainly if there are FPGA chops in the crowd, we could take the idea and run with it.

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Re: New Oric Project. The OriClone-1

Post by Dbug »

ibisum wrote:
Sun Nov 22, 2020 10:54 am
I mean, if there is to be a next-Gen Oric design, having multi-core Oric's doing video interlacing seems kind of intrinsic .. not suggesting anyone butcher their Oric's to build one, but certainly if there are FPGA chops in the crowd, we could take the idea and run with it.
Well, technically there are many ULA around, it's trivial to find, so at worse you could just add an expansion board to the Oric with three additional ULA and some RAM :D

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Re: New Oric Project. The OriClone-1

Post by ibisum »

Also something that an FPGA/ASIC-based project could consider, no? I guess the hard work is really in defining a standard peripheral set for OriClone-1 and getting developers behind the new technology.

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