Re: 6809 in an Apple II

[A2CPM <a2@wilserv.com>]

Hi, y'all!

On Jun 1, 5:09 pm, Alex wrote:
<--- snip --->
> Clearly the emulated 6809 could be slowed down by a factor of 25 and
> share the memory with Apple 2 ... not very exciting IMHO. If 10 people
> wanted a clone of the Stellation Mill card, I could make the boards
> using real 6809E CPUs available from Jameco.
<--- snip --->

    You probably do not want to clone revision A of the Mill card.
Just tested my rev. A Mill in a variety of Apple ][ models and found
that it will only work in an unenhanced IIe, or earlier.  Also,
replacing the 6809 with a 6809E will result in a Mill that will not
allow a II+ to boot.  Finally, the "DEMO1" program that displays an
updating counter on the screen is the ONLY program I have that works.
The "ASM09" program, a 6809 assembler, either won't assemble a source
file or fills the screen with garbage, depending on how you respond to
the prompts given by the assembler.

Willi