Daniel, thank you so much for the TBDML!
Are you familiar with Matlab's Embedded Target for HC12?
The latest version of CodeWarrior that it supports is v3.1. It's a bummer, I know. Currenty, I have the TBDML downloading to the RAM of the MC9S12DP512 just fine, but it appears not to be able to download to its flash. There are commands in the preload.cmd file such as "FLASH" and "FLASH DISARM" that are not recognized when using the TBDML. Also, in the command file menu of CodeWarrior's Debugger, Vppon.cmd and Vppoff.cmd are not even command file options, as they are when using P&E's pod.
I noticed that you suggested to someone earlier that they upgrade to the latest version of CodeWarrior, but that is not an option for me.
Thank you for your help.