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RE: [N8VEM-S100:1811] S-100 68K CPU board V3

Dave there is a crying need to get some kind of general DRAM circuit that can get us GB or DRAM for these 32 bit CPUs.  It’s way past my pay scale! Any help you or others can give would be great.





John Monahan Ph.D

e-mail: mon...@vitasoft.org

Text:    mon...@txt.att.net



From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of yoda
Sent: Tuesday, August 13, 2013 10:22 AM
To: n8vem...@googlegroups.com
Cc: cct...@classiccmp.org
Subject: Re: [N8VEM-S100:1811] S-100 68K CPU board V3


Hi Andrew!!!


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!

Andrew Lynch


PS, this project has been in work for 2 years+ so I am very happy to see it working.


From: n8ve...@googlegroups.com [mailto:n8ve...@googlegroups.com] On Behalf Of yoda
Sent: Monday, August 12, 2013 10:40 PM
To: n8ve...@googlegroups.com
Cc: mon...@vitasoft.org
Subject: Re: [N8VEM-S100:1808] S-100 68K CPU board V3


Hi John


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).



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