Heres a shot of what the new driver looks like installed.
the programming header can be removed to allow fitting to 40h and greyscale editions. the series editions can leave it on but it can interfere with some exposed vias below it causing button presses. i have slipped some non conducting paper under a couple of mine whilst developing the firmware.
thanks for the overwhelming response everyone. very happy to finally share this project with you all. which i was reluctant to do for fear of letting people down if it wasn’t possible to achieve the performance needed.
whats next?
I’m designing a test jig to program and test devices before shipping. pressure fit pogo pins etc. otherwise its rather difficult to test these without soldering them on to the grids.