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RE: [N8VEM: 8655] Re: S-100 Motherboard
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- Subject: RE: [N8VEM: 8655] Re: S-100 Motherboard
- From: "Andrew Lynch" <lyn...@yahoo.com>
- Date: Sun, 20 Feb 2011 10:47:18 -0500
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> -----Original Message-----
> From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On Behalf Of
> Sent: Saturday, February 19, 2011 5:49 PM
> To: N8VEM
> Subject: [N8VEM: 8655] Re: S-100 Motherboard
> Andrew & the group:
> Some more testing today yielded some progress. I have now installed
> floppy controller and the hard disk interface board on the
> motherboard. Neither is connected to drives.
> Good news is that the system still resets on power up and the basic
> monitor functions work.
> Next step will be to try booting CP/M after connecting the drives -
> very big step.
> I did run into a couple of issues today:
> a. First, the pin numbering on P2, P3, P4, & P5 on the motherboard is
> wrong as long as you think the square lands are pin 1 for each of
> these headers. If you assume the square lands are pin 2 then all is
Hi Rich! Thanks! Yes, the pin 1 errors were fixed on the updated S-100
backplane revision. This was an error on the original board and sorry for
the hassle. With each revision the boards are getting better!
> b. At first I could not get an external /PRESET to work. To make a
> long story short - the circuit was fine - I had a switch set wrong on
> the CPU-Z. The fascinating thing is that I don't think I changed it
> purpose so that may explain some problems with my old system. It is
> working fine and testing also reveled that all I really need is a
> switch that will ground bus pin 75 to do a reset. No active circuitry
> is needed.
Thanks! That's great news!
> Next steps are the toughest ones though.
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Wow! I am looking forward to seeing your progress! Please keep us posted!
Thanks and have a nice day!