Re: Blank CMS SCSI Card PCBs

[r_beaudry@hotmail.com (Rich Beaudry)]

david@uow.edu.au (David Wilson) wrote in message news:<3caa5e60$1@news.uow.edu.au>...
> 
> Ok, I have worked out which pins are inputs and which are outputs.
> I did this by pulling the chips, inserting then into a `breadboad'
> and powering each one up in turn. I then used a logic probe to determine
> which pins were floating (inputs) and which were driven (outputs).
> 
> U14 A1	inputs 1-9,11		outputs	12-19
> U16 A2	inputs 1-9,11,17	outputs 12-16,18,19
> U9 A3	inputs 1-9,11,13-16	outputs 12,17-19
> 
> So, provided none of the pins are bi-directional all I have to do is step
> through the 2^10 (2^11 and 2^15 respectively) possible inputs and record
> the outputs. Then I look for patterns and derive the equations.

David,

If you can put the combinations into electronic form, and email me a
set or two, I'll be MORE than happy to do pattern matching, and
equation derivation.  Even if you only have handwritten notes, make a
photocopy, and mail them to me!  That's a lot of work for one person
to go through....

Rich B.