[Coco] MPI help needed

[Gene Heskett]

On Tuesday 10 June 2014 23:30:27 tonym did opine
And Gene did reply:
> Don't get any crashing, just the regular Extended Basic 2.0 message.
> 
> However, if I put the megabugs rompak in slot 1, and no matter WHAT
> slot # the switch is set to, when I power everything on, mega bug
> fires up.
> 
> If I have the switch set to, say, slot 3, and I put the mega bugs in
> slot 3, power everything up, all I get is the standard coco3 extended
> basic message. If I leave the switch on slot 3, power everything off,
> and move the rompak to slot 1, and power back on, it will work, even
> wth swtich on 3, and rompak in slot 1.
> 
> Tony
> tonym at compusource.net

The below was my best shot at it.  So I think a loop in basic doing the 
poke & peek idea might be a way to proceed.  The present behavior 
certainly isn't correct.  And sounds like a chip failure that would need a 
scope to trace out.

What does the peek &hff7f say now?
> 
> ---- Original Message ----
> From: "Gene Heskett" <gheskett at wdtv.com>
> Sent: 6/10/2014 11:25:29 PM
> To: coco at maltedmedia.com
> Subject: Re: [Coco] MPI help needed
> 
> On Tuesday 10 June 2014 22:59:12 Bill Nobel did opine
> 
> And Gene did reply:
> > That would suggest the switch itself to me, as the slot doesn’t
> > seem to switch.
> > 
> > Bill Nobel
> 
> Bill, Tony;
> 
> I have been under the impression, could well be wrong, that the switch
> is read only at power up. What happens if the switch is moved and the
> power is cycled?  Otherwise you have to poke $FF7F, with $00 for slot
> 1, $11 for slot 2, $22 for slot 3, and $33 for slot 4.  IIRC you
> should be able to read back what you wrote to $FF7F.
> 
> In that unmodified one, it will also ghost to $FF9F, which is in the
> GIME image of a coco3.  Near instant crash. :(
> 
> > On Jun 10, 2014, at 8:47 PM, tonym <tonym at compusource.net> wrote:
> > > OK gents...
> > > 
> > > Need an assist... Pulled out an old grey -3024 (not yet modified)
> > > out of the mothballs. Plugged it in, into a coco3. Can't get
> > > anything but slot 1 to work, no matter WHAT slot the switch is on.
> > > 
> > > Using a rompak, tried all 4 slot, using their respective switch
> > > position, only slot 1 worked.
> > > 
> > > Putting switch on slot 2, pak works in slot 1, same thing for
> > > switch to slot 3, slot 1 works, same with switch set to slot 4,
> > > slot 1 works.
> > > 
> > > Any ideas?
> > > 
> > > Tony
> > > tonym at compusource.net
> 
> Cheers, Gene Heskett


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS