Trak upgrade rom

Hello again! I've been away a long time, moved twice since the last time I was around here, but I'm settled again and have the old 8-bits out... Finally got around to finishing up some of my work from before...

So, this is an upgrade ROM for the Trak series of drives. It adds: Ultraspeed at 57600 (speed byte $08), support for custom skew formatting, and enhanced density thrown in.

I don't have a parallel printer, or anything to test it with, so I didn't write any code to support it. If people ask for it, and someone is willing to go through the test phases for me, I can look into adding it.

Let me know how it goes for you! Next task, the Rana!