Re: Ultima 3 "Mockingboard" version.

[Linards Ticmanis <ticmanis@coli.uni-sb.de>]

"Rich J." wrote:

> Let me know the # of pins, pin spacing, and package width, and I'll
> add the chip to the CAD program....

I'll check it and then get back to you. Obviously since I don't have a
MB, I don't know yet exactly which 74xx and analog support chips are
used, only the 2 6522s and the 2 AY-3-8910 are firmly established.

> 
> If you do want to pursue this project (making a mockingboard)Or any
> other
> apple II hardware project, let me know!  I can make 2 sided drilled
> Printed Circuit Boards using a REAL APPLE II!

That would be very cool, especially since I don't have the equipment
to CAD and produce a real PCB. I could only use a prototyping board,
e.g. a filed down ISA prototyping board.

> 
> I just got done printing an A/D board and it works good!  I had to
> file
> a bit on the BUS connector, but it fits and functions.  I need to find
> some plating chemicals!  The card fits in the Apple II slot and the
> case cover fits nicely

Most electronics store should have such chemicals I think. They're
sort of expensive though IIRC.

> 
> The mockingboard is a very simple design.  The traces go from
> the bus connector, in a straight line, to the chips.  Very
> easy to trace by sight.

Great. Well I need a schematic. I'm not enough of an engineer to come
up with the right set of little thingies like resistors and capacitors
to add to the main chips.

-- 

Linards Ticmanis

 The Master said, "The business of laying on the colors follows the
preparation of the plain ground."