What are the steps for upgrading from Panther to Snow Leopard or is there a combo updater?

Snow leopard can't run on a Powermac, only an Intel Mac.

If you have an Intel Mac;

You don;t have to do it in steps. You can install Snow Leopard straight from the 10.6 DVD, To get the DVD however is a problem as it is no longer online, instead you have to ring an Apple store and talk to phone sales to order the 10.6 DVD through them

If you live in the US, Customer Service and Sales Support at 1-800-676-2775 and get the Snow Leopard install disc: $20 USD

If it was an Intel Mac, it wouldn't be running Panther; Apple never released an Intel-compatible version of Panther to the public. Therefore, there is no upgrade process that doesn't involve getting a newer Mac.

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Ah, of course, Niel, I missed that completely.

Leopard is the max OS for PowerPC processor Macs.

Mac OS X 10.5 Leopard installation system requirements

http://support.apple.com/kb/TA24950

Leopard is no longer available at the Apple Store but may be available by calling Apple Phone Sales @ 1-800-MY-APPLE (1-800-692-7753).

If you can't obtain a retail install DVD from Apple, look on eBay or Google the installer part numbers to possibly find at an on-line store. Here's what to look for:

MB427Z/A Leopard 10.5.1 install DVD

MB576Z/A Leopard 10.5.4 install DVD

MB021Z/A Leopard 10.5.6 install DVD (single user)

MB022Z/A Leopard 10.5.6 install DVD (5-user family pack)

Installing Mac OS X 10.5 Leopard

http://support.apple.com/kb/HT1544

Mac OS X 10.5 Leopard Installation and Setup Guide

http://manuals.info.apple.com/en/leopard_install-setup.pdf

After you install the base 10.5, download & install the 10.5.8 combo update at http://support.apple.com/downloads/Mac_OS_X_10_5_8_Combo_Update

The DVD should look like this

Caution - Leopard does not support classic mode. So, if you currently open OS 9 apps in classic mode, you won't be able to do this if you upgrade to Leopard.

 Cheers, Tom 😉