Page 1 of 1

DragonMMC Out of Memory with CoCoVGA

Posted: Mon Sep 05, 2022 12:15 pm
by KenH
Has anyone successfully used the DragonMMC on a Dragon with CoCoVGA installed?
Although I can CAT and MLOAD and MDISKI OK, trying to run the Explorer yields ?OM Error.
Print MEM shows just 8K free on my Dragon 64.
Upgrading (and downgrading) of the DMMC firmware doesn't seem to help.

The Dragon works perfectly when used with the CoCoSDC, so this is not a RAM issue.
IMG_2819.jpg
IMG_2819.jpg (3.71 MiB) Viewed 8702 times
IMG_2817.jpg
IMG_2817.jpg (2.71 MiB) Viewed 8702 times

Re: DragonMMC Out of Memory with CoCoVGA

Posted: Tue Sep 20, 2022 6:02 pm
by dublevay
The MMC clock is wrong, which suggests the back up battery is dead - but I don't know if that would cause this ?OM ERROR.

Re: DragonMMC Out of Memory with CoCoVGA

Posted: Wed Sep 21, 2022 7:51 pm
by KenH
dublevay wrote: Tue Sep 20, 2022 6:02 pm The MMC clock is wrong, which suggests the back up battery is dead - but I don't know if that would cause this ?OM ERROR.
Indeed I had a bad battery, but I get the same memory problems with the clock properly set.
IMG_2930.jpg
IMG_2930.jpg (683.78 KiB) Viewed 8597 times
This does not seem to be a RAM issue, as when I unplug the MMC everything seems to work as expected:
IMG_2931.jpg
IMG_2931.jpg (868.9 KiB) Viewed 8597 times

Re: DragonMMC Out of Memory with CoCoVGA

Posted: Thu Sep 22, 2022 10:30 pm
by Alastair
Perhaps the configuration settings or autoexec file have become corrupt due to the battery problem.

Re: DragonMMC Out of Memory with CoCoVGA

Posted: Mon Oct 17, 2022 12:47 pm
by prime
I've seen this with DragonMMC when the edge connector is dirty / not making proper contact with the socket in the Dragon.

Try giving both a clean and see if things improve.

Cheers.

Phill.