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There is/was/is a hardware mod (which enables active cart voltage control) This is useful in flashing the bennvenn carts as you currently need to pull out the cart and re-insert for each block. Its not a big issue having to cycle the cart in and out, but to produce the best product I can, I've ordered the parts and need to solder them in once they arrive. So not essential, but nice to have.

on the BV1.00 firmware the cart shows up as 4 ROM's and 4 save files on a disk drive. On the official there is only 1 ROM and 1 Save (the file size is automatically adjusted depending on the ROM on the cart) If you have a 64M bennvenn cart, you'll use only 1.GB and 1.Sav on the BV1.00 ROM. I'll make that video to clear up any confusion.

As far as the fightercart goes, It will read and write the save file without any problems. It is just the flashing that is not yet implemented.

I'm happy to swap cart for joey-squinson as you suggest, I'll need to wait on the arrival for my next batch of components though. I have enough for 10 Joey-squinsons and 5 were ordered this morning.

Flux in the form of pens, pastes or liquids all depend on the flux type used. Where I work, I have found halide based fluxes more than 20 years old still work far better than modern equivalents. They are very corrosive and require thorough cleaning to prevent rapid deterioration of PCB & components. I'm unsure if these are still available, and require ventilation when in use.

I find in general, RMA fluxes give best results with hot air soldering as a certain amount of time needs to elapse while the flux is in its 'activated' temperature range. The slow temperature/time ramp hot air provides is ideal.

Organic based fluxes typically work at room temperatures so they are both effective and require cleaning (a lot are alcohol based and de-min water can be used to post-clean. A lot cheaper and safer than Iso)

Another thing to consider is the source of your components. If your IC's for example have been stored for years without desiccants, oxides will form on the pins requiring a more aggressive flux to get a reliable solder joint. You'll know when you get a bad batch of IC's as they don't wet as easily as they should when soldering.

All fluxes have a shelf life, and should be stored in a refrigerator. I personally don't bother as I'll use a 50ml bottle in a few months.

Flux cored solder is just about the standard these days. They are said to have a shelf life too, though I have a 10yr old 1kg roll that I use day to day and can't say it works any better/worse than a roll a few months old. One thing I would recommend on an old roll of solder is to give it a wipe over to remove the lead oxide that forms on it. It doesn't effect the soldered joint but dirties your tip a lot quicker.

Update:

BennVenn flashing is supported. It may take some time to roll this firmware into v1.01 as it uses a new file system however I'll make the standalone BennVenn firmware available. Changing between the two takes only a few seconds - Drag the firmware file to the drive, it'll un-mount, relflash and re-mount with the new firmware running. Time ~3 seconds.

Flash write speed of an 8mbyte ROM is ~2min.

Edit: Improved my flash algorithm - now @ 55seconds for a 64mbit ROM.

Just reading through that datasheet, That's a slow chip! 32second chip erase, 15second flash write time (excluding protocol overhead) and no bulk write mode. And only 2mbytes. Averaging 30seconds for an LSDJ transfer. Same protocol as the Bung carts, though bung tie /WE to SND.

Would anyone be interested in loaning me one?

Jazz - Yes, found a $5 webcam at my local supermarket. 320x240 - Might as well use my GBcamera :-)

Hmmm pin3 as in Snd or /WE? (depends which end you count from)

In either case, it can be supported. My BennVenn carts operate with Flash WE tied to cart-bus WE. If that is the case then two birds with one stone.

I'll be detecting cart types via the Flash IC's CFI information. This will allow almost complete compatibility with any cart (assuming there is no /WE trickery or boot sectors need unlocking [nanoloop] in which case firmware updates will be necessary)

I'll post updates soon

I'd have to get my hands on one to add support for it, unless it uses a similar chipset to the EMS cart. Do you have a photo of its internals?