Re: How to Boot 2nd drive?

[drsmooth@relex.com (Edhel Iaur)]

tilghman@vuse.vanderbilt.edu (Tilghman Lesher) wrote:

>Nathan Mates (nathan@visi.com) wrote:
>: In article <01bbc414$847264a0$d71d6682@130.102.2.10.130.102.29.215>,
>: David Colston <david@email-one.com> wrote:
>: >My father bought an AppleIIe (I think) which has a dual disk drive sitting
>: >on top of it.

>: >How can you boot Drive2?

>:    Swap the drives in the case, mess with the EPROM on the controller
>: card, or other fairly technical stuff. [On the Apple //c, it's fairly
>: easy; the //e never had that]

>Wasn't there a command like PR#$C6xx  where xx was some entry point in
>the firmware (NOT C600)?

On my web page, I've got a very small machine language routine from
_A+_ that boots the external drive; it puts certain values into the
//c's processor's registers before calling that magical address.  If
you are in BASIC.SYSTEM, you MIGHT be able to do the equivilent to
_A+_'s routine at the command prompt this way (with some added
hokey-POKEy), but you'd probably lose the contents of the registers
before ProDOS sent the actual call to that magical address.
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