Re: Apple 2 benchmark?

[Alex Freed <alexf@mirrow.com>]

RedskullDC wrote:
> Sure I've seen some pics of your Nanoboard2 with the Apple2 slot adapter?

Maybe you have but AFAIK there are exactly 2 Apple slot adapters
in the world at the moment :)

>
> Look forward to playing with it.

There is a web site in the making (not by me) that will have all the
sources pretty soon.

 > Have been tinkering a little with your DE1 version already.
> Made a 65C816 board to plug into one of the GPIO sockets on the
> DE1 with the idea of replacing the 6502 core.
> Works fine using some simple code and pushbutttons etc, though I
> haven't managed to get the 65C816 to work with the rest of your code.

Unfortunately I haven't yet seen even a (free) 65C02 HDL model that
is accurate enough to run some Apple programs. Like ProDOS 2.xx


> probably easiest to emulate something like a Zip-Chip, but with a much
> higher clock speed for the emulated CPU. Docs can easily be found for it.
> If you still want to talk to real Apple cards (which I expect you do) then
> the speed needs to be cut back to 1.024MHz when doing slot IO naturally.

I'm not trying to make anything useful :) Just build the simple version
of the existing system (no real slots) and NOT throttle down the clock.
And see how fast it will go.

> Red.

-Alex.