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Microvitec CUB rgb Sync-a vs. Sync-b ql/oric

Macshrike

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Joined
Feb 27, 2022
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10
Ls,

I'm busy cleaning and, trying to, repair my dad's old computer collection.

Question is as much about the CUB monitor as an oric Atmos. But I figured the CUB would be surely known here. Oric not so sure. So I posted this here.

I've got a working cable for the sinclair Ql 8pin rgb to the CUB 6pin input.
I found the pin schematics for both.
QL shows rock solid on the monitor.🤗

Now there's this oric atmos 48k with a broken UHF modulator. It has an RGB 5pin out.
Finding that that's a straight forward RBG-sync-ground plug I made a quick and dirty plug.
Tried connecting the oric sync to the CUB sync-a. Got a signal but it didn't lock. Same for the sync-b. Although that looked better somehow.

Q's: can someone tell me how I should do this?
Could it be the flimsy shielding?
Should I connect perhaps the oric sync to both -a & -b on the monitor?
Is it at all possible to use the CUB for other RGB signals than the Sinclair Ql?

Highest regards, Mac
 
Possibly a clash between digital and analogue RGB. I see there were various models of the CUB


but I would expect it to work.
Hi G4ugm,
Thanks for the reply.
It's definitely one of the oldest models. Can t read the number on the back... it's that old😁

Thing is still; how do I connect the single rgb Sync from the oric atmos to the Sync-A & Sync-b on the Input on the monitor?
I m guessing that those are horizontal and vertical sync.

Regards , Mac
 
There is a useful little IC, the LM1881, into which you can feed analogue composite video or composite sync and it produces digital composite sync and digital vertical sync outputs - however you need hsync as well. I have seen people say that if you feed the composite sync output into hsync on the monitor it will often work, but you want to be sure it will work so maybe a modified version of the LM1881 like the EL1883? On this IC the odd / even line output is replaced by an actual Hsync output.


No longer produced by the manufacturer, but bound to be still available from component suppliers.

Note that the 'level' of the vsync and hsync signals will be equal to whatever supply volts you run it on, so if you need TTL-level signals (0V/5V) you need to run the IC on a 5V supply. It is also possible that your monitor may require the sync to be the 'other way up' so you might have to pass the separate sync signals through a couple of inverter gates, depending on whether the monitor needs sync pulses which head up to 5V or down to 0V.
 
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