UAV Rev D modded 7800 Rev B issues

[UAV Rev D modded 7800 Rev B issues]

The fact that legs on most through hole ICs are flat is not a valid argument. Machine pin socket are intended for such legs. That is what I wanted to say.

 

The best of the two worlds : machined pins on carrier. But they are hard to find or you need to do your own carrier. And they are expensive, so generally overkill.

[UAV Rev D modded 7800 Rev B issues]

No sorry, this is irrelevant, that is not how they work.

Yes they are painful to rework.

Yes they are incompatible with square pins used for stacking purpose.

Yes they are not low profile (except for some special ones)

But they are superior in all other aspects. And normaly when you put some in place, it is not to do any rework later on it/remove them, there is very very very low reason to do it.

[New Coleco RGB board?]

10 hours ago, ChildOfCv said:

Some more interesting info:

On NTSC boards, pins 41 and 42 on the expansion board are unconnected.  Pins 31, 32, and 33 are external audio, external video enable, and external video composite.  The SECAM board changes all of that.

 

Pin 41 is now external audio.  42 is external video enable.  Pins 31, 32, and 33 are the YPbPr signals.  So the SECAM Expansion Module 1, if it exists, apparently has much better video than the NTSC one does.  And likely leagues better than the Atari 2600 SECAM.

Ok mysterious difference between the RGB version for the SECAM market and the others are no longer mysterious. The adaptation needed for the super game module is now obvious.

Yes Expansion Module #1 exist and is specific to this model. Beside the same adaptation for external sound, that explain the "no sound/no picture" when PAL or NTSC Expansion Module #1 is plugged into a RGB model.

How things are done in #1 remain to be seen. A YPbPr TIA clone ? I will open one and take pictures.

 

[New Coleco RGB board?]

Is is astounding to see how clean and modern is the design of the console and the PCB for the time being.  And mainly done by one man.

[New Coleco RGB board?]

So you preferably need a sync separator before the OSSC input.

Worth a try. (see the ready to use "syncblaster" which has the proper 75ohm output level).

 

And it would be perfectly coherent for why it work on a "normal" TV but not on the OSSC as a normal TV have the CSYNC imput common with the CVIDEO input.

[New Coleco RGB board?]

You are crazy 😋

I will be able to put a scope on one soon.

[New to Colecovision, what mods would you say are necessary?]

How could he do better than Citrus3000psi NTSC or PAL boards ?

The integration is perfect, and the implementation simple, clean and based on the Ti reference design.

For the record all is there:

https://oshpark.com/shared_projects/WhLjVooT

https://oshpark.com/shared_projects/ogorMaoU

with the bonus:

https://oshpark.com/shared_projects/0hrYbjDu

 

I'm waiting an original SCART model and will try to find time to look how they did the RGB conversion and perhaps find why OSSC hate the original RGB  implementation (will try to guess as I don't have an OSSC yet).

[SAC Spinner Electrical Repair - Advice Needed]

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the orientation (axial rotation) wouldn't have an affect on the switch performance

Yes that what I would have said if I was more fluent at thinking in english

[SAC Spinner Electrical Repair - Advice Needed]

Try yourself with a small magnet, you will see. I am confident. (and correction: REED not RED, or ILS in French).

[SAC Spinner Electrical Repair - Advice Needed]

RED work the same regardless their orientation. They are in the magnetic field or out.

They are simple, cheap and in this kind of application better than micro switches (rated for 10^8 cycles).

So here the bad one need to be replaced.

[AV mod kit for Intellivision?]

When RF is fine, have you something connected on the composite video output of the mod ? If no, it would be interesting to try with both output connected. The digital video output of the intlv is open collector/drain and modulate the continuous (with a pretty high impedance) voltage source provided by the RF box. So the pickup point and the input impedance of the mod are critical to get the proper intended video signal.

[Legacy versus ARM-based 2600 Game Development]

Rev B of the LPC2103 is not affected by MAM.2 errata.

[RGB Modded Intellivision with OSSC]

Not exactly.

As designed, I think that the OSSC will be less picky with "border line compliant" sync signal with sync on green sync signal.

I don't have an inty scart version, too rare even if I'm in France. So I don't know how the sync signal is generated in them.

Yes, on the "normal" scart standard, there is a dedicated pin for sync, but OSSC accept sync on green too.

 

Combining the sync with the green and configuring the OSSC accordingly worth a try.

[RGB Modded Intellivision with OSSC]

On all schematics I saw or by picture guessing, there is no proper video output buffer ensuring proper scart levels on double terminated 75ohm link.

On the OSSC, you should use sync on green to go trough the input buffer circuit as the video signal. Otherwise you go directly  to the TVP video dac.

The TVP is perhaps more picky or not properly configured to process correctly the border line sync signal.

 

Measurement with the scope should be done with the output of the RGB mod connected to the OSSC.

[Is this Atari 7800 even worth trying to repair?]

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Lots of "bubbles and wrinkles" on the board.

This is normal, this is due to the process used for the tin deposit on this era (wave tin deposit).

RF shield apart, it is not in a terrific shape.

[I feel sorry for the French too ... but]

I put it on my todo list. Yes I could choose the frame/fields and the line to sync on on my scope.

[Vsync issue on PAL Atari 2600 woody]

At this point in the debug, you need a scope, preferably one with video trigger.

[SGM2]

I asked for too not a long time ago, but is seems to be a taboo question 🥴😋☺️

You should change the subject of the topic.

[VecFever]

Hum, Vecfever is solely based on Extreme Vectrex Multicart, there is too much "coincidence" to be pure coincidence and Extreme Vectrex Multicart is prior art.

That great that someone leverage the Extreme Vectrex Multicart work on a full open hardware/software project.

There is lot to be done to catch vecferer on the software front, but that is work that will never be lost now and that could only progress.

 

New to the retro scene world, it is something very strange to me all these hardware/softwares that their authors no longer want/could produce, not open and witch disappear with them. Even more strange when their are the support for the small homebrew ecosystem and help to retribute the game authors (like the LTO flash witch is very very hard to get, but without, you could not buy roms).

 

Sorry for my poor English after a hard day too. One of my best friend passed away today at 45...

[4 switch 2600 snow unless I hold power switch upwards?]

👍

[4 switch 2600 snow unless I hold power switch upwards?]

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All the soldering is from the factory

I think that you should redo the TIA socket soldering and checking that there is no track cut at the join between the track and the solder pad

[Telegames questions]

It is a small hex key, but you need to find the right type (metric/imperial) and size.

[Telegames questions]

Or replace the linear regulator by a DC-DC switching regulator.

[Opcode ColecoVision wishlist....]

Is a new batch of SGM planned ?

[I feel sorry for the French too ... but]

Yes it is possible. I was only exposing the theories as I still not look at it physically. But as the pal TIA look to me more and more as a simple quick hack of the NTSC one, you are surely right.

One interesting experiment would be to find a scheme to rewire a PAL TIA to generate NTSC. On a PAL console, we should not be too far with simply exchanging the crystals with two NTSCc ones.