TI-99 4A MMC card
I found a nice design for the TI-99 last week and I saw some potential to improve on the design.
I have create a new design the fits in the original cartridge size with ISP programming and integrated the MMC module.
Have ordered 20 cards that will be available to buy when ready.
Here is the link to the original project.
http://endlos99.github.io/flashrom99/