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Re: [N8VEM-S100:4046] Re: Run of Dual CF-Card/Hard Disk IDE S-100 Boards


One of the issues John has pointed out in the past, is that the current software/hardware is VERY SELECTIVE on what brand and model of cards that work with this board...

It maybe necessary at some point to redo his code based on the Z80 Zeta code or other ?, that handles a large number of cards...

I'm sure its a timing issues... but it may need someone to look at it in detail...


On Sun, Jun 8, 2014 at 7:43 PM, Thomas Owen <thomasbr...@gmail.com> wrote:
My preliminary check this afternoon shows me that there is a timing issue at U15, the 74ls02.  Using my logic analyzer and monitoring the inputs and the output (which clocks the flip flop) I see a big timing difference between SEL_SECOND and WR.
What this means is that the output of the gate never goes high.

I am going to start a new post to document and deal with the troubleshooting of this problem.


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Tom Lafleur
(858) 759-9692