I have updated my Old School Rules, incorporating some feedback received on TMP. I have cleaned up the formation diagrams, added a summary table for musket and artillery fire, and added some details to hand-to-hand fighting especially around the procedure for firing at a charging unit. There is now only one cavalry line formation, a line in two ranks. After play tests, this seemed the only formation that made sense for a variety of reasons, mainly allowing for reinforcements during melee and space considerations. I have updated the links.
Old School Rules
They remain a pretty basic framework and don’t address details such as passing fire, and a bunch others, but I think still provide a good basic framework to add details and tinker with.