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

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

Michael J. Mahon wrote:

> The problem is speed.  The video needs to be translated at 3.58
> megapixels per second (if you assume the 140 horizontal pixel model)
> or even faster if you want higher resolution.  14MHz would be my choice
> with a shift register running at the same rate.
>
> Most ROMs and microcontrollers are out of gas at those rates.

Ah, you're right. The fastest 8 bit PICs run at 48Mhz and pull 12 MIPS,
which is enough to handle colour modes, but will fall short of
faithfully tracking the 14Mhz dot clock rate.

The 16bit units can surely handle the job, but then you're dealing with
QFP's and .5mm lead spacing which is a bit hobbyist unfriendly, but
still quite affordable.

Matt