[Coco] Booting OS9 from Drive 1

[Bill Barnes]

Another option, more work intensive, and requiring hacking your drive cable and using a DPDT switch, is to hack the cable and use the switch to swap the D0 and D1 drive select lines, so either drive could be Drive 0, depending on switch position (and the other drive Drive 1.) More Work, Greater flexibility, Requires remembering switch position (even if labeled.)

-Later!   -WB-    -- BABIC Computer Consulting.


--- On Sun, 10/4/09, Robert Gault <robert.gault at worldnet.att.net> wrote:

> From: Robert Gault <robert.gault at worldnet.att.net>
> Subject: Re: [Coco] Booting OS9 from Drive 1
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Date: Sunday, October 4, 2009, 9:40 PM
> Gene Heskett wrote:
> > On Sunday 04 October 2009, Derek wrote:
> >> I am having a problem being able to boot OS-9 in
> the following
> >> configuration. I have an FD-502 Drive housing with
> a 3.5" and a 5.25"
> >> drive. My 3.5" drive is set as drive 0 and my
> 5.25" is set as drive 1. I
> >> have some old 5.25" OS-9 based disks that need to
> boot using the DOS
> >> command. I switch to drive1 and then type DOS. It
> starts to load OS-9,
> >> goes to the Loading OS-9 Screen but will then
> automatically switch to
> >> drive 0 trying to access the boot data on drive 0
> and not boot from the
> >> 5.25" disk in drive 1. I have tried using the
> drive1 command to set it as
> >> the boot drive but no luck.
> >> 
> >> Is there an easy way to make it so I can boot off
> drive 1 and uses these
> >> old 5.25" OS-9 disks without having to make a
> backup on to a 3.5" drive
> >> for each disk I want to boot?
> >> 
> > You could patch the boot module on track 34 &
> change the /d0 to /d1, but don't forget to set bit 8, so the
> hex 31 will be a hex b1.
> > 
> >> Thank you
> >> 
> >> 
> >> 
> >> ** Mistrust Authority. Promote Decentralization
> **
> >> 
> 
> Derek,
> 
> The above is just part of what you need to do. You will
> also probably need to change the /DD descriptor to point to
> drive #1 and change any scripts , such as startup, that
> might point to /D0.
> 
> I believe the current version of NitrOS-9 has some scripts
> that make it simple to boot from a drive other than 0. You
> just need to edit the scripts and use them to create a new
> boot disk. The scripts will select the correct Boot module,
> /DD, and any other changes that seem appropriate.
> 
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