RML380Z ROM images

[Tony Duell]

> 
> On Mon, 2005-06-27 at 23:16 +0100, Tony Duell wrote:
> > > 
> > > 
> > > Does anyone happen to have ROM dumps of from the RML 380Z CPU board? 
> > 
> > I cna;'t help you, alas. IIRC, some RMLs used the TI 3-rail 2716s that 
> > most programmers can't handle. I assume you've checked for this...
> 
> Aha no I hadn't - and you were spot on! :)  I didn't realise that TI's
> 2716 was a three rail device and their 2516 was equivalent to everyone
> else's 2716. You learn something new every day and all that :-)

Don't worry, that caught me out <mumble> years ago. And I am still making 
equally stupid mistakes...

> 
> The CPU board ROMs in both this 380Z and my own one are TMS2716's as it
> happens (yet the 80 col board character ROM in the one machine uses a
> TMS2516)

As I mentioned, that's what hte infomration file (which is what RML 
called the technical manual) shows.

> 
> I wonder if I can modify my programmer to at least read three-rail
> devices (it'd be handy to be able to read 2708's on it anyway). Maybe
> via a little carrier that supplied the other two rails to the chip. I'll
> have to grab the relevant datasheets...

It will deepnd on your programmer. If it does something clever (like 
tries to read at non-standard Vcc levels to check the data is reliably 
programmed, or if it chacks the device's Vcc current), it may not work. 
Otherwise it should be fine.

-tony