Re: A new pseudo-disk for Apple 2.

["Michael J. Mahon" <mjmahon@aol.com>]

Alex Freed wrote:
> "Linards Ticmanis" <ticmanis@gmx.de> wrote in message
> news:44c15b95$0$22008$9b4e6d93@newsread2.arcor-online.net...
>
>
> > Problem with this: On a II/II+ you can't reliably freeze the CPU for
> > more than about 5 cycles, else it'll lose state.
>
>
> Sure you can. Softcard does. The trick is that the clock is only removed for
> a few microseconds but then
> is allowed for one cycle while READY is not asserted. So you can do DMA for
> say 80% of all the cycles
> and allow the 6502 to fetch a byte now and again.
>
> The problem is that any such solution will increase the complexity of the
> board very significantly.

I agree.  Using a cannon to shoot a mouse violates one of "Robot's Rules
of Order".  ;-)

For heaven's sake, it's a 2-pin pushbutton switch header, and there are
plenty of holes to bring out 2 wires!  (I'm assuming that an IRQ/NMI
approach is taken, with an on-screen menu.)

BTW, any reason for choosing the MultiMedia Card over the more common
(and almost interchangeable) SD card?

-michael

New, faster SUDOKU v2.0 solver for Apple II's!
Home page:  http://members.aol.com/MJMahon/

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