Is anyone else able to buy things from the store right now? I'm not seeing the confirmation dialog when I click on the Buy Now button and I wondered if it is just me.
I've noticed that Donut Dodo is was unplayable in Ultra HD for me after this update. The display lags behind the audio and the controls. It plays fine in HD (720p) and Full HD (1080p).
I think you are dumping them correctly.
A2600-A.BIN and A2600-B.BIN match the first 8K of the NTSC Ikari Warriors ROM from the Atarimania collection.
A2600-C.BIN matches the last 8K of the NTSC RealSports Boxing ROM from the Atarimania collection.
I have two copies. Both dump to known versions.
Blue Singapore label - 2.1 oz - Matches "BurgerTime (1983) (M-Network)". Identical to rom on Atarimania.
Missing label - 2.5 oz - Matches "BurgerTime (1982) (Mattel) [a1]". In the Good2600 collection.
The difference between the two is between $1000-$1FFFF. One file has a duplication the first 4k bank and the second is filled with $FF values. I don't think there is any difference in the game itself.
Burgertime (No label).bin
Burgertime (Blue Singapore label).bin
I'm not sure if this helpful, but I was able to dump the other known version of the cart using "Cartridge / Dump / Atari 2600 / Tele-Games 16kB Bank Switched Cartridge". I'm using Maxflash Cartridge Studio 2.25.