[Opendispense] Questions - new memory map
Adrian Chadd
[email protected]
Wed Aug 13 17:06:14 2003
On Wed, Aug 13, 2003, Bernard Blackham wrote:
> On Mon, Aug 11, 2003 at 03:10:50PM +0800, Harry McNally wrote:
> > - Terminate the four wire wrap pitails on signals needed for read and
> > write and full addressing (A15) onto the PCB.
>
> So the questions remain, which 4 lines do we want to run up? Almost
> necessarily - A15, R/W, Enable. This leaves one more to choose from:
>
> - Interrupt line, possibly the most useful - but could use polling
> instead.
>
> - Clock - running this line up here saves us a crystal on the
> daughterboard for the UART. Though, we can probably afford
> another crystal on the board.
>
> - Reset - to reset the state of the UART with the CPU. needed?
>
> I'm leaning towards the interrupt line because it appears to make
> the serial comms that much more reliable. Any strong reasons for any
> of the others?
Depends how the software is written. Whats the current interrupt handler
doing?
Why can't you have em all?
Adrian