Re: AppleLogic.org Question

[alex.freed.007@gmail.com]

On Apr 3, 7:45 pm, David Wilson <mcs6...@gmail.com> wrote:
> On Apr 4, 12:02 pm, "John B. Matthews" <nos...@nospam.invalid> wrote:
>
> > LS367 for U12, U13, U14
> > note: pin 1 & 15 of LS367's connect to VMA.

I suspected it was a logical place but nice to have a confirmation.

>
> P.S. I found my notes on the OS9 daughter board.
>
> 6809 -> 6502 address mapping (upper 4 bits of address modified)
> ---------------------------------------------------------------
> 0000..AFFF -> 1000..BFFF (main memory)
> B000..DFFF -> D000..FFFF (language card)
> E000..EFFF -> C000..CFFF (I/O cards)
> F000..FFFF -> 0000..0FFF (6502 ZP, stack, text screen, 6809 interrupt
> vectors)

Same mapping as the MS SoftCard. And for the same reason even with a
different CPU.

One remaining issue: the links to the MILL.DSK and OS9.DSK images on
the www.hackzapple.com
are broken. The images are not in the standard archives either. Does
anyone have them?

-Alex.