Interfacing a 68000 to RAM

[Tony Duell]

> 
> On 1 Jun 2009 at 6:50, dwight elvey wrote:
> 
> >  Does anyone have a nice pointer to a diagram
> > of how the 68K bus is to be connected to RAM?
> >  I not that familiar with all the various signals.
> > I've spent some time searching but maybe don't
> > have the right search string.
> 
> Download the 68K User's Manual from Freescale:
> 
> http://www.freescale.com/files/32bit/doc/ref_manual/MC68000UM.pdf
> 
> And check out Chapter 4.  (It's actually very well-written)

You might also look at the _second edition_ of the 'Student Manual for 
the Art of Electronics' (or some similar title, I can get the exact title 
if you can't find it). That has a design for a 68008-based computer 
(processor + SRAM + hex keypd 'front panel') which can even be built on 
plugblock-type 'breadboards'. The 68000 is a very similar bus, so this 
should be applicable.

IMHO this book explains things well. You don't just follow the schematic, 
you understnad why you're connecting various pins to each other.

-tony