[Coco] Paul Barton's 8Meg board, Roger Taylor's DrivePak, and NitrOS-9

[Paul Barton]

Paul Barton here, the CC3 NoCan 8/16/32/64MB guru. It's too bad that I sent
all of my hardware pieces back to John which leaves me with nothing to play
with (anymore). I too hope that John can come back to the group or just an
email stating how he is.

Paul



On Mon, Jun 9, 2014 at 9:44 PM, Kip Koon <computerdoc at sc.rr.com> wrote:

> Hi Everyone!
> I'd like to get my hands on an 8-Meg board myself.  The last time I talked
> with John Turner he was still working on his version of Paul Barton's 8-Meg
> Memory Board.  I wonder how he's coming along.  He was adding some other
> goodies as well like a true serial port and parallel port and maybe some
> other things like a Real Time Clock but I don't remember for sure.  He told
> me some time ago that he was using some surface mount components and later
> decided to redesign the PCB using only through-hole technology.  I have not
> heard from John in some time.  I hope and pray he is alright.  Take care my
> friends.
>
> Kip Koon
> computerdoc at sc.rr.com
> http://www.cocopedia.com/wiki/index.php/Kip_Koon
> http://computerpcdoc.com/
>
>
>
> -----Original Message-----
> From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Robert Gault
> Sent: Monday, June 09, 2014 11:22 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: [Coco] Paul Barton's 8Meg board, Roger Taylor's DrivePak, and
> NitrOS-9
>
> Would I be lucky enough to have a reader who uses both the Barton 8-Meg
> board
> and Roger's DrivePak? Usually I use a 6309 512K Coco3 but was recently
> testing
> my 6309 8-Meg DrivePak system. It will work perfectly with NitrOS-9 3.3.0
> until
> I try to load the DrivePak drivers. Then there is a complete hardware
> crash.
>
> If found that 6809 NitrOS-9 v3.2.9 works fine with the 8-Meg board, so
> something
> has changed which I can't seem to find.
>
> Roger's DrivePak uses $FF6C-$FF6E which has been assigned to a MOD pak in
> the
> OS-9 defs but I don't have those drivers installed. The software turns off
> the
> interrupts while accessing $FF6C-$FF6E in any case. Also there is no
> problem
>
> with a 512K system.
> The Barton board uses $FF9B and $FFAx the same way, for the most part, as
> NitrOS-9 handles 2Megs.
>
>   FF9B  Reserved.
>          1MB and 2MB bits, Write only.
>          Bit 7 - na
>          Bit 6 - na
>          Bit 5 - 8MB Memory Bit          NoCan3 bits for 8MB.
>          Bit 4 - 4MB Memory Bit          NoCan3 bits for 8MB.
>          Bit 3 - 8MB Video Bit           NoCan3 bits for 8MB.
>          Bit 2 - 4MB Video Bit           NoCan3 bits for 8MB.
>          Bit 1 - 2MB Video Bit   Disto & NoCan2/3 bits for 2MB.
>          Bit 0 - 1MB Video Bit   Disto & NoCan2/3 bits for 1MB.
>
> $FF9B must be set before $FFAx go get the full 8Megs.
>
> I don't see why but there is some weird interaction between this hardware
> and
> v3.3.0. I will be testing older versions of NitrOS-9 to see if there is one
> that
> works.
>
> Robert
>
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>
>
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>



-- 
Paul T Barton
paultbarton.1944 at gmail.com