Re: Apple //e's RGB Card To Apple IIgs' RGB Monitor

["mdj" <mdj.mdj@gmail.com>]

Michael J. Mahon wrote:
> Alex Freed wrote:
> > I'll make a deal with you, Michael. I would not tell the group what the best
> > algorithm for drawing circles is. :))
> >
> > The concept of SRAM is great. Once you design a practical implementation
> > with either a uC to load it at boot or interface to Apple bus to do the same
> > you'll end up with a pretty compicated design.
> >
> > By contrast a GAL is a single chip solution. And it's hard to beat the price
> > too.
> > About a buck.
>
> OK!  Fair enough.  ;-)

I too should probably keep my trap shut, being I suppose, a software
guy who does electronics as a hobby.

Of course, I lean towards microcontroller solutions because that's what
I know. Since my programmable logic toolkit is limited to FPGA, I have
fairly limited knowledge of smaller scale PLD's. Would one of the
experts here care to explain the development toolchain, and if possible
elaborate on a design for this using a GAL? I assume it's a matter of
coding up a ROM with 4 bit addressing and 12bit words and hoping it
fits. I favoured the uC approach because the programming involved is
trivial assuming your uC is fast enough, which I admit without actually
coding the loop and cycle counting it, it's unlikely that's feasible.

I would really appreciate it, and I'm sure many others reading this
thread would.

Matt