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The only 15Khz with RGB input that I have, that could still be in working order (has been in storage for years so no idea) has scart input. So need to create a contraption to convert the 15 pin VGA connector into scart. Not high on my priority list at the moment. Once I'm back in action, I suspect I will be first put on a lot of Amiga stuff, as many items are still on the todo list from mid summer. I might be able to sneak a patch in when I work on C64 VIC-II stuff (a project like that is still in the planning some time in the future)
That said, even IF we add support in the main core, a lot of other cores will be unavailable to you when using a 15 khz monitor. Things like the VIC-20 and Atari 2600 cores don't have switchable video modes.
Yes, minimig core supports 15kHz RGB out, you need a standard 'minimig VGA to SCART cable' to enjoy this. Schematics attached.
You can buy that cable ready-made, too - I guess it would be bad form to link it here, but a bit of judicious googling would no doubt find it.
Most of the cores I've ported have the ability to output 15KHz video, but they default to scandoubled VGA mode. The Minimig core can save the scandoubler on-off setting as part of its configuration, but the others can't yet.
I don't think a CM8833 would appreciate being fed with a 31KHz signal.
For the Minimig core, hold down an F key at bootup to force the screenmode:
F1 for scandoubled NTSC,
F2 for scandoubled PAL
F3 for 15KHz NTSC
F4 for 15KHz PAL
For the other cores (Atari, C16, NES, Megadrive, TurboGfx16, Master System) - hold down the menu button for a second or so to toggle the scandoubler on / off.
For Minimig it will be saved as part of the config file. Likewise with the Atari ST core. For the other cores it has to be done every boot - they don't have config files yet.
I don't know for sure. I think some of the MiSTer cables have extra resistors to make sure the sync pulses aren't at anything approaching TTL level. I believe - though I'm not sure - that the CM8833 actually requires TTL sync, though.
So my cable has arrived and it works great on the Philips, the picture quality is fantastic. however the Minimig core doesnt seem to retain the F4 setting on boot to enable the 15khz mode, am i missing something?
That setting *should* be retained as part of a configuration file. So if you save a default config file from the OSD it should stay put.
Having said that, the config file creation is known to be buggy, especially with a crowded SD card. If you still have trouble I can send you a "blank" configuration file which has the scandoubler disabled.
The last reply was more than 365 days ago, this thread is most likely obsolete. It is recommended to create a new thread instead.
