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Re: [N8VEM-S100:6153] 68000/68010 CPU board

Hi John

It is not the speed of the processor - it is the state machine timing.  I believe Pontius (spelling?) walked through the state machine and proved the timing is independent of processor speed so until the timing in the S100 state machine if fixed or the IDE board sensitivity,  it is pointless to proceed as I have never gotten it to work with the 68K board.  In fact I had to add some additional F series chips to get it working with the propeller board as well to get the IDE board to switch drives.  The 68K board works ok but is somewhat limited use when you can't reliably do I/O to S100 peripherals.  Wilcox pointed out the problems in his book but never gave a reliable solution.


On Saturday, January 31, 2015 at 11:19:28 AM UTC-6, monahanz wrote:

The issue Rick is the current board while quite reliable at about 6MHz,  has problems going to higher speeds.  There also MAY be a problem accessing the 8255 on the IDE/CF card.

I think it was Dave Fry that noticed this.( I may have the wrong person).  Anyway we are so busy these days you may be best to place a small order yourself for the original board.

The kiCAD files are at the bottom of this page:-






From: n8ve...@googlegroups.com [mailto:n8vem...@googlegroups.com]
Sent: Friday, January 30, 2015 11:16 PM
To: Edward Snider; n8vem-s100
Subject: [N8VEM-S100:6153] 68000/68010 CPU board


Hi Ed,


Are we anywhere closer to ordering the 68000/68010 CPU boards?

I would like to add my name to your list for 2 of them.


I have been collecting ICs to build one, and I really want to get started this year.

I already have several flavors of 68000 (68000P8, 68HC000P-12), and a 68010P10.



Rick Bromagem


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