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Re: [N8VEM-S100:1808] S-100 68K CPU board V3
Yes I will be posting a lot of stuff in a couple of weeks (source code, pictures, etc).
Yes I have not forgotten the other project and am using this as a stepping stone for monitor and other code. I have been thinking about it a lot and have come to the conclusion we may be better off with just a 68040 SBC then trying to marry the 68360 to one. The 68360 introduces a lot of complexity that is not really necessary. I think we are going to have to accept some type of small board with SMT memory on it to get to where we want to go. I think we are seeing the same thing happen on the 80386 board as well. I am looking at ways to make a small FPGA into a memory controller and still have room for some more functions in it like timers which we will need for linux or other unices.
I am also going to look at the amount of work required to put uclinux on the s100 68K. It will be a swapping version but a lot of code should be reusable going forward so it is not a wasted effort.
We should probably chat sometime on the direction we want to go on this project and come up with a plan.
PS I am glad we finally got here too - this is the architecture I like the most (not an Intel fan).
On Tuesday, August 13, 2013 9:05:29 AM UTC-5, lynchaj wrote:
Yay! Woo Hoo! Great news! We have S-100 68K CPU running!
Once this project is working maybe we could take another look at the 68360 P1 and/or 68040 SBC?
This is really great news! Please post pictures and notes on the wiki! Let’s get the word out!
Thanks and have a nice day! You’ve already made mine! w00t!
PS, this project has been in work for 2 years+ so I am very happy to see it working.
Thought I would give an update - found the problem with memory - it turns out pin 1 of U2 on the board had a cold solder joint - guess it finally gave out. Reflowed the solder - the ground plane is a pretty big heat sink around pin 1 and can easily get a cold solder joint. Any ways after repairing that and playing with jumpers and switch settings I have 1 Meg of memory working with the S100-68K-V3. I also have the oscillator at 16MHz so the CPU is running at 8MHz and is a buss master. I am using the short S100 mother board from the group so it may have better noise immunity than the 22 slot mother board like you are using. I will do some more testing and want to boost the memory to at least 2 Meg for some experiments. I will get started next on the new monitor and getting data to load from the IDE CF card. Looks like I am on my way to getting CP/M 68K ported. I have a little clean up to do in a couple of areas (upgrade to latest compiler code, etc).