[sjt99]

The 8K files have to be set up using a menu program loaded into the first and last bank of the cartridge image you're building (first and last because the chips that control the bank switching can initialize in either of those banks at random). The cartridge boards were sold as part of two large group orders (16K and 64K Guidry boards), on the CodeHackCreate website (64K Guidry boards) and made as short-run additional boards (64K Guidry boards) by several individuals. The only current source for the larger boards (512K types) is me. I do have a small number of the last batch of 512K non-inverted boards (bare boards) left.

Ksarul

I had heard there were new boards that had been developed, but couldn't find availability or pricing.
I had extra duplicate cartridges, which was a quick almost free source of boards to experiment with.
How are multiple 8k rom cartridge bin files prepared so they can be software bank switched.

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For those interested in knowing more about the layout of the TI cartridges, and would like to experiment with one. I'm uploading a pdf (soon to be revised a bit) that will help.
It also details how to convert a TI invaders cartridge into an eprom cartridge.