PC connectivity using DMA style approach

A project log for TI-99/4A memory extension with Pipistrello FPGA

64 megabytes RAM expansion for the TI-99/4A using the Pipistrello FPGA board and a buffer board.

Erik PiehlErik Piehl 09/04/2016 at 20:210 Comments

Now I finally have an easy to way to push software to the TI. I built support for serial communication (over USB) at 230kbps allowing me read and write the memory expansion concurrently to the TI - without the TI noticing. This is hugely useful also for software development and debugging.