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
Sent: Monday, February 17, 2014 12:48 PM
Subject: Re: [N8VEM-S100:2416] MSX2 Utility Board V1 Build info
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.
* The warmest the 7805s have gotten is 112F, this is with no forced air flow.
On Wednesday, February 5, 2014 7:02:39 AM UTC-8, lynchaj wrote:
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.
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