[Coco] Just another peek...

[Bill Pierce]

Dave, it sounds like you're off to a good start. I wish I knew more about SD cards and could help.
I do have one question...
You mentioned locking out the boot memory essentually making it a rom.. Why?
This makes it impossible to modify modules (in memory) and "cobblering" a new boot. It also locks out "Xmode", "tmode", "dmode>, and "wmode" from changing descriptors on the fly.
I'm not protesting, just wanting to know the reasoning behind locking the memory. Or am I misinterpreting your post?

 

 


Bill Pierce
"Charlie stole the handle, and the train it won't stop going, no way to slow down!" - Ian Anderson - Jethro Tull

 

My Music from the Tandy/Radio Shack Color Computer 2 & 3
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E-Mail: ooogalapasooo at aol.com


 

 

-----Original Message-----
From: Dave Philipsen <dave at davebiz.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Fri, Oct 9, 2015 7:59 pm
Subject: Re: [Coco] Just another peek...


Oh and, by the way, I'm definitely not knocking drivewire.  It certainly 
has
its place and its functions are much more than just a 'disk 
controller' but the
SD card on the CoCo3FPGA is an order of magnitude 
faster than drivewire running
at 115.2kbps.  And rightfully so as its 
SPI interface is running at a frequency
that is an order of magnitude 
higher than a typical serial port. It is
especially noticable when 
you're doing disk intensive operations like
assembling or compiling 
programs.


Dave


On 2015-10-09 17:49, tim
franklinlabs.com wrote:
> That makes sense. I was looking at the Atari 800 SOC
for the DE1 and
>    they did the same thing. Thanks for clarifying that.
> 
>  
On October 9, 2015 at 3:39 PM Dave Philipsen <dave at davebiz.com>
>      wrote:
> 
The wires that can be added are not a requirement. The DE1 
> evidently
>     
neglected to connect the card insertion switch. So if you want
>      NitrOS9
> 
to automatically detect when you have removed the card or
>      'hot-plugged'
>
a new one in then you need the wires. I have personally run the SD
>      card
>
successfully under NitrOS9 without any wires. In that condition 
> it's
>     
best that you regard the SD card as non-removable unless you shut
>      OS9
>  
down.
>      As I mentioned before the access to the SD card is not yet
>     
integrated
>      into DECB. The card does work in that environment but you must

> write
>      your own 'driver'. I have personally used code to access
sectors
>      (reading and writing) from the DECB environment. In fact, I 
>
already
>      have the core of a program that can manage multiple 'partitions'

> on
>      the
>      SD card and make them available for booting from DECB.
>
Dave Philipsen
>      On 2015-10-09 15:21, tim franklinlabs.com wrote:
>      >
>From what I understand (from the documents) the SD card only 
> works
>     
with
>      > Nitros9 and requires a wire to be added (not sure about the wire
>
> thing). Everything I read states it doesn't work with DECB (yet!
>      >
maybe?)
>      >
>      > On October 9, 2015 at 1:27 PM Michael Brant
>      >
<brant.michael.l at gmail.com> wrote:
>      > I am also interested in knowing more
about the SD card access as 
> i
>      > would
>      > want a stand alone
setup.
>      > On Oct 9, 2015 2:24 PM, "Barry Nelson"
>      >
<Barry.Nelson at amobiledevice.com>
>      > wrote:
>      > > I would want one of
these, but I do not want to have to use an
>      > external
>      > >
DriveWire server. Any updates on how the SD card access is
>      > going?
>    
> >
>      > >
>      > >
>      > > > Dave Philipsen dave at davebiz.com
>     
> >
>      > > > Fri Oct 9 10:51:34 EDT 2015
>      > >
>      > >
>      > >
> 
> > > It works just like the other video modes on the CoCo 3. The
>      >
video
>      > > memory is part of the 512k memory map. In this case about
>    
> 288,000
>      > bytes of
>      > > memory are used.
>      > >
>      > >
> 
> >
>      > > > Dave Philipsen
>      > >
>      > >
>      > >
>      > > O/
On Oct 9, 2015, at 1:45 AM, Brett Gordon <beretta42 at
>      > gmail.com>
>    
> > wrote:
>      > >
>      > > > >
>      > >
>      > > O/ That's awesome
Dave! So where exactly is this video memory
>      > coming from?
>      > >
>  
> > O/ ahhh.. i really want one of these now...
>      > >
>      > > > >
>     
> >
>      > > O/ --
>      > >
>      > > O/ Coco mailing list
>      > >
>    
> > O/ Coco at maltedmedia.com
>      > >
>      > > O/
https://pairlist5.pair.net/mailman/listinfo/coco
>      > >
>      > >
>      >
> --
>      > > Coco mailing list
>      > > Coco at maltedmedia.com
>      > >
https://pairlist5.pair.net/mailman/listinfo/coco
>      > >
>      > --
>      >
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>      >
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