IBX PCMCIA 'port'

[Adrian Godwin]

>
> On Tue, Feb 12, 2002 at 12:03:16AM +0000, Adrian Godwin wrote:

No I didn't : I think I was quoting Ralph here !

> > >
> > > Whilst it is true that the PCMCIA port is not a full PCMCIA
> > > implementation, it possible that this might still be a useful port. In
> > > particular, it would not be too difficult to get linear flash ROM cards
> > > to work on this port IMHO. I have a few linear flash cards that I use on
> > > my Newton that I intend to try...

This was mine, though ..

> > A hunt around Google suggests that it might be the socket used on
> > the NC for expansion ROMs, and that they might replace rather than
> > supplement the internal ROMs. But I can't find any details of how
> correct
> > those ROMs are wired.
> >
>
> Neither can I :-) and i have acess to an original nci design....
>
> as shown in my box i run from a signgle 16bit macronix eeprom so they only need
> D0-D15 and they limited the available space on these external rom cards
> to 4megs

So does the other ROM map on the end of the first ROM, or does it use
the 16/32 bit bus mode switch to widen the bus ? I recall some very cunning
code at the start of the Arm600 ROMs that ran in 16 bit mode from
power-on-reset but in 32-bit mode when executing a soft reset.


> > You can reset the box without power cycling it by shorting pins
> > 5 (reset) and 6(ground) of LK5. I'm not sure yet if this provides
> > a soft 'break'-like function, but it's likely to be less destructive
> > to ram contents than power cycling.
> > 
> err um this is the hardware reset line, I cant remember off hand if it removes
> the dram refresh or not. It certianly resets teh rest of the system back
> to por mode

Yes, it is. That's what BREAK was originally, but I'm not sure if it
remained that way - maybe it just simulates a reset. The Amiga really
did reset, and checked for some patterns in dram to see if it should
attempt a warm boot ..


-adrian