Hey guys,
I'm planning on removing the modulator from this stfm, I'm just wondering if I should remove everything else in the modulator area as well, will I still get my regular RGB ouput.
what can be safely removed from STfm
- stephen_usher
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Re: what can be safely removed from STfm
You'd definitely lose Composite Video. Maybe composite sync too? I don't know.
Why do you want to remove it?
Why do you want to remove it?
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
Re: what can be safely removed from STfm
Because I want to remove any device that creates RF off the motherboard. I only want RGB as an output. And I don't like the idea of redundant components being left behind.
Re: what can be safely removed from STfm
I believe that you can remove all the components that are in the box saying "stuffed with the modulator version" in the schematics. And there is an alternative set of components (2 diodes, a transistor and 2 resistors) to get a basic csync signal. It should also be in a box saying "stuffed when no modulator" (well, may be not written like that, and I have the same on the STE schematic that I am studying since last fall).
Re: what can be safely removed from STfm
Yup. Remove it. Turn it into a STf!
EDIT: On the STf it seems that you have to solder in some components if you want to have composite out.
EDIT: On the STf it seems that you have to solder in some components if you want to have composite out.
Re: what can be safely removed from STfm
Cheers guyz ;D
Re: what can be safely removed from STfm
I'm afraid this will produce only the composite sync signal (required for SCART RGB), not the composite video. Yet RGB SCART requires composites sync, not composite video (which may be used for this purpose), so it is even better.DoG wrote: ↑Sat Feb 13, 2021 9:36 pm On the STf it seems that you have to solder in some components if you want to have composite out.
Re: what can be safely removed from STfm
Yup. Thanks for pointing it out. If modulator is present then there is composite video. If not, you have composite sync only. This is the difference between STfm and STf. So if you want to remove modulator you have to solder in a few components to keep sync.tzok wrote: ↑Sun Feb 14, 2021 11:19 amI'm afraid this will produce only the composite sync signal (required for SCART RGB), not the composite video. Yet RGB SCART requires composites sync, not composite video (which may be used for this purpose), so it is even better.DoG wrote: ↑Sat Feb 13, 2021 9:36 pm On the STf it seems that you have to solder in some components if you want to have composite out.
VGA doesn't use composite sync right? It uses hsync and vsync instead if I remember correctly.
Re: what can be safely removed from STfm
Atari SM/SC monitors use H/V sync, same is for VGA monitors, but some 3rd party RGB monitors and SCART equipped TVs require a composite sync. Also Chinese upscalers like GBS8200 and SCART-HDMI converters need it.
Re: what can be safely removed from STfm
All done
For anyone interested components were: R215: 10K R216: 150R R217: 100R Q12: 2N3904 CR12 & CR13: LN914 diodes
For anyone interested components were: R215: 10K R216: 150R R217: 100R Q12: 2N3904 CR12 & CR13: LN914 diodes