[Coco] ?PEEK(&HFF90) RETURNS 126 ON MY UNUPGRADED 26-3124?

[coco at yourdvd.net]

I stand guilty :-( Anyway, judging by your e-mail address, you realise
the ultimate answer to life the universe and everything is 42, however
knowledge of the answer precludes knowledge of the actual question -
D.N.A. - My favourite author :-)
-r

> -------- Original Message --------
> Subject: Re: [Coco] ?PEEK(&HFF90) RETURNS 126 ON MY UNUPGRADED 26-3124?
> From: Frank Pittel <fwp at deepthought.com>
> Date: Wed, April 25, 2007 2:27 pm
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> 
> If you're one of the ones that sniped (or should I say out sniped )
> you're in trouble! :-) (for the humor impared :-))
> 
> Frank
> 
> 
> On Wed, Apr 25, 2007 at 12:51:46PM -0700, coco at yourdvd.net wrote:
> > Honestly - it could have been my sister's kids that violated the
> > package, rather than the post office - it was WELL packaged. :-)
> > (Perhaps I am cursed - maybe someone I outbid HEXed me :-) )
> > p.s. - I am through bidding for awhile (as long as I can resist the
> urge
> > to SEARCH eBay  - it's more difficult than quitting smoking, not
> bidding
> > that is) -r
> > 
> > > -------- Original Message --------
> > > Subject: Re: [Coco] ?PEEK(&HFF90) RETURNS 126 ON MY UNUPGRADED
> 26-3124?
> > > From: Mark Marlette <mark at cloud9tech.com>
> > > Date: Wed, April 25, 2007 12:42 pm
> > > To: coco at maltedmedia.com
> > > 
> > > Robert,
> > > 
> > > Man yo are hitting the first for everything. I'll maqke sure in the  
> > > future that the IC is in more protected place. The Antistat foam
> and  
> > > bubble packaging usually is enough.
> > > 
> > > The MPI is simple. The equations are simple. The interface and
> design  
> > > are VERY problematic.
> > > 
> > > Mark
> > > 
> > > Quoting coco at yourdvd.net:
> > > 
> > > > got the gal replacement for the pal. it was squished by the post
> office
> > > > - looked like they stepped on the sucker, but i straightened all
> those
> > > > pins out plugged 'er in and voila - coco 3 mpi :-)
> > > > While I had the 3024 MPI opened, I noticed just how different it is
> > > from
> > > > the 3124. The 3024 should be easy to build an exact clone but using
> > > your
> > > > gal instaed of the tandy pal - all other circuits at first glance
> > > appear
> > > > to be standard ttl and some power supply stuff. i made one some
> time
> > > ago
> > > > using 74ls138's and 74ls374 latches, etc. to clone the mpi - a
> lot of
> > > > discrete circuitry. had 8 slots, but otherwise worked like a coco 3
> > > > mpi. I had planned to replace the 138's with 154's and make 16
> slots
> > > > (major overkill), but then i popped by paul bartons site and he
> > > > mentions the upper bit of both nybbles being used as an enable
> disable
> > > > of the associated signal. I didn't think the multi-pak worked
> like that
> > > > and didn't account for it in the thing i built, but it still
> worked :-)
> > > > one day i'll dig all this junk i made out of storage and stick the
> > > > schematics somewhere.... r
> > > >
> > > > p.s. i made the slots out of a short piece of ribbon cable and a 40
> > > conn
> > > > ids connector.
> > > >
> > > >> -------- Original Message --------
> > > >> Subject: Re: [Coco] ?PEEK(&HFF90) RETURNS 126 ON MY UNUPGRADED
> > > 26-3124?
> > > >> From: Mark Marlette <mark at cloud9tech.com>
> > > >> Date: Tue, April 24, 2007 10:57 am
> > > >> To: Robert Gault <robert.gault at worldnet.att.net>
> > > >> Cc: coco at maltedmedia.com
> > > >>
> > > >> Robert,
> > > >>
> > > >> I don't have the data right in front of me....hold on let me check
> > > >> C-9's CVS for the mpak manual...
> > > >>
> > > >> Nope...have to add it...
> > > >>
> > > >> I looked at my source to the .abl code for the GAL, 26-3024
> update.
> > > >>
> > > >> The new range of the MPI is $FF40-$FF7F.
> > > >>
> > > >> If I looked at the 3124 mod that I have already documented at
> home I
> > > >> could quickly figure out what it's original range was. From my web
> > > >> page it appears that the MPIs unmodified range went into the
> GIME's
> > > >> address space($ff90).
> > > >>
> > > >> The peek makes sure that it is not. This si the first I have heard
> > > >> that it isn't working.
> > > >>
> > > >> Done this MANY years ago so I don't recall.
> > > >>
> > > >> Sorry for the slow response. Was gone over the weekend and have
> many
> > > >> business/list emails to reply to.
> > > >>
> > > >> Regards,
> > > >>
> > > >> Mark
> > > >>
> > > >>
> > > >> Mark Marlette wrote:
> > > >>
> > > >>
> > > >> Robert,
> > > >> What GIME is in your CoCo?
> > > >> Test performed on the same CoCo?
> > > >> I'm sure I have done this test on both MPIs. Been too long ago.
> > > >> Thanks,
> > > >> Mark
> > > >> At 4/21/2007 02:12 PM, you wrote:
> > > >>
> > > >>
> > > >> Marks test of ?peek(&hff90) returns 255 on all of my 3024
> multi-paks,
> > > >> however it returned 126 on my 3124. I opened the 3124 and there
> is no
> > > >> satellite board nor any piggy backed chips nor any mod of any
> kind - i
> > > >> can't see that this pak has been upgraded. Does this test only
> work
> > > for
> > > >> the 3024's? thanks - Rob
> > > >>
> > > >>
> > > >> I just tried a test with a Coco3 and an MPI 3024. Without the
> MPI the
> > > >> PEEK returned 126 and the same with the MPI.
> > > >>
> > > >> What are you trying to determine with this PEEK, whether the
> MPI was
> > > >> upgraded for Coco3 use?
> > > >>
> > > >>
> > > >>
> > > >>
> > > >> --
> > > >> Coco mailing list
> > > >> Coco at maltedmedia.com
> > > >> http://five.pairlist.net/mailman/listinfo/coco
> > > >
> > > >
> > > > --
> > > > Coco mailing list
> > > > Coco at maltedmedia.com
> > > > http://five.pairlist.net/mailman/listinfo/coco
> > > >
> > > 
> > > 
> > > 
> > > 
> > > --
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> > > Coco at maltedmedia.com
> > > http://five.pairlist.net/mailman/listinfo/coco
> > 
> > 
> > --
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> 
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