[Coco] 256k upgrade

[Bob Devries]

Wasn't there a series of articles in one of the Coco magazines regarding the 
256K upgrade?

I know I had a long case Coco2 upgraded that way. I do not now remember the 
details, but I do know that I created a special OS9 Level 1 boot disk, and 
that it was able to use a large-ish Ram Disk.

Regards, Bob Devries
Soldier's Hills 2
Las Pinas City
Philippines

--
Besides a mathematical inclination, an exceptionally good mastery of one's 
native tongue is the most vital asset of a competent programmer.

Edsger W.Dijkstra, 18 June 1975

----- Original Message ----- 
From: "Bruce W. Calkins" <brucewcalkins at charter.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Wednesday, February 03, 2010 12:44 PM
Subject: Re: [Coco] 256k upgrade



> ----- Original Message ----- 

>

> From: "Robert Gault"

>

>>> One Caveat; they provided support for OS-9 Level 1, but no one has yet

>>> figured out what needs correcting for NitrOS9 Level One. Quite simply,

>>> NitrOS9 will not boot.

>>>

>>

>> Bruce,

>> This is new to me. Are you saying that with this specific 256 upgrade, 

>> NitrOS-9 Level I won't boot or that there is a more general problem with 

>> NitrOS-9 LI?

>>

>

>

>

> OS-9 needed a modification to run on the 256k equipped CoCo.  The disk had 

> a Basic script that modified a sector or two on an unmodified copy of the 

> boot disk after verifying that it was a unmodified boot disk.  You could 

> then use the modified disk to create any further boot disks.  So far, 

> nobody has identified just what modifications were made to what modules. 

> NitrOS9 will probably need similar modifications made to run on the 256k 

> banker modified CoCo.

>

>

>

> Bruce W.

>

>

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