Thanks Neil! That’s great! Yes, the MSX2 is a very strange design. Many things about it are odd. I had not seen anything like it. The memory mapper is the strangest I think. I am not sure if the printer port is like an IBM PC printer port or not. The circuitry looks somewhat familiar but I do not know more than that. Thanks and have a nice day! From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of nbreeden I'm continuing to push forward with the shake out of the board. * The SR flip flop isn't working as expected when I strip my system down to just the CPU and Utility card. I've had to bump this up to 0.1uF (from I believe 470pF) to get a reliable poser on reset. * The Y2 (printer ports) looks to be working as expected. It took a while to figure it out as it's a strange design. I've been running the board constantly for several days in a basic UART test loop. * It's ran very solid. * The warmest the 7805s have gotten is 112F, this is with no forced air flow. -Neil
Thanks Neil! That’s great news! Fantastic! Tremendous progress! I really appreciate all your effort and I think this is going to help a lot of builders. -- |