AltairZ80: Improved choice of boot ROM

[psco]

An appropriate boot ROM is chosen based on the attached disk image.

[hharte]

Hello Peter,

The change looks good.

You may want to squash out the merge commits with "git rebase -i <hash_before_your_first_commit>"

Take care,
Howard

[psco]

Will be replaced by a new PR without the commit clutter.

[hharte]

Hello Peter,

To fix your master branch, you can do the following:

1. Add the opensimh repository as a remote:
   git remote add opensimh git@github.com:open-simh/simh.git

2. Fetch from opensimh:
   git fetch opensimh

3. Rebase your changes on top of opensimh/master:
   git rebase opensimh/master

4. There will be one merge conflict, which you can skip:
   git rebase --skip

5. Then run "git log" and you should see this:

Author: Peter Schorn <peter.schorn@acm.org>
Date:   Tue Oct 21 11:07:02 2025 +0200

    AltairZ80: Improved choice of boot ROM

commit 4d38373206cd7c0ce8b94f5e16bd4429cb96430f (opensimh/master)
Author: Mark Pizzolato <mark@infocomm.com>
Date:   Sun Oct 12 07:58:51 2025 +0200

    LINC: Add Visual Studio project files.

6. You can then remove the opensimh remote if you do not want it anymore:
   git remote rm opensimh

7. If you want to prevent having those merge commits in the future, you can set the configuration for your repo to use the rebase strategy when doing git pull as follows:
   git config pull.rebase true

With this setting, "git pull" will always try to rebase your local changes on top of the upstream changes.

Take care,
Howard