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RE: [N8VEM-S100:1459] Re: S-100 board reorders

Hi Dave!  Thanks!  Well, we were close on the S-100 68K CPU board but have found a problem.  John and I just did another round of S-100 6502 CPU board prototype boards and found there are problems with the TMA circuitry on the S-100 6502 CPU, S-100 68K CPU, S-100 80286 CPU, and S-100 80386 CPU boards.  I have made the corrections to all the effected boards by hand which should minimize the impacts.  They are all back in the trace route optimizer for cleanup.


Sorry for the bad news.  Thanks and have a nice day!

Andrew Lynch


From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of yoda
Sent: Sunday, February 24, 2013 3:32 PM
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:1459] Re: S-100 board reorders


How close are we on the S-100 68K???  There is a lot of pent up demand for that board - especially me as I work on the other 68xxx system - I am trying to write platform independent code and would like to test it on the new 68K board as well.





On Sunday, February 24, 2013 11:17:26 AM UTC-6, lynchaj wrote:


Well I was hoping to get the S-100 68K and S-100 80286 CPU board PCBs ordered next but they are not cooperating.  The S-100 68K CPU board is nearly complete and should be done soon.  It has taken much longer than I expected though.  I would like it to complete trace route optimization before ordering PCBs.

In the meantime, I am thinking we could make another round of S-100 board reorders.  What I am thinking is the S-100 IDE V2 PCBs are always popular and so are the S-100 buffered prototyping board PCBs.  I would like to do another round of those and hopefully while they are settling the S-100 68K CPU and the S-100 80286 CPU boards will complete or at least get “close enough”


Another idea is the S-100 bus terminator board.  Basically there are 10 builders willing to get these boards “as is” which is the full sized PCB with some prototyping area.  Nothing fancy but useful for terminating a legacy S-100 backplane.  However these have *NOT* been prototyped so there is some additional risk.  I think it is minor though since the S-100 backplane has this exact circuit and it works fine.


Ideas?  Thoughts?  Comments?  Questions?  All welcome!  Please lets discuss what the next steps should be.  Thanks and have a nice day!

Andrew Lynch

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