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Divmmc enjoy - snapshot save

Posted: Wed May 24, 2017 2:54 pm
by Johntag
Hi there

Can you please please please help :)

I recently bought a zed x 48 k rubber keys with the fantastic bytedelight divmmc with 8 gb sdcard
It s all performing well except i can not save a snapshot of any game
It gives me an error and creates a snapshot file with 0 kb

Can some kind soul share some light :)
Thank you

Also, i am using an av composite to scart to a lcd but the image is not so great
Can i use some kind of hdmi adapter and if so wich do you recomend

Re: Divmmc enjoy - snapshot save

Posted: Wed May 24, 2017 3:43 pm
by Lardo Boffin
I only have a zaxxon DIVMMC and that saves fine when pressing R (I think, but possibly S - not used it in a while). I'm pretty sure I had to set jumpers on it for the correct kind of spectrum before it worked though as it supports 48 and 128K. It's worth checking they are ok on yours if you have any.

Also load and saving will undoubtedly use different tracks on the edge connector. Give them a good clean!

Presumably the sd card is ok? They can be problematic - on occasion I have had to copy everything off it, reformat it and copy everything back again to get it working.

Have you tried typing in a simple program and saving it to the MMC? If that does work then I would imagine it is not the card or the edge connector.

As for the picture.... I have the same - the composite via a scart adaptor is poor. The 'dot crawl' is terrible.
You could try getting a dedicated comp to scart cable (I.e. not a cable plus adaptor) which may help a bit but probably not much.

You could also try ... bility.htm
Not got one or sure whether it would work with your MMC but you could ask the guy who sells them.

I solved my problem by buying a toastrack with the RGB out and it has a perfect picture.... :lol:

Re: Divmmc enjoy - snapshot save

Posted: Thu May 25, 2017 8:46 pm
by 1024MAK
The dot crawl on the 16k and 48k ZX Spectrum computers is due to a limitation of the circuit design. It is caused by the colour encoder chip using a completely different crystal oscillator while the rest of the picture is generated by the ULA using the main crystal oscillator.