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Thanks! Now to teach myself 6809 instruction set! 
BTW error in my previous post, the memory for programmers is $C880-$CBEA.
$C800-$C880 is for Vectrex BIOS housekeeping. I probably don't want to go waltzing through that! 

Hey everybody,
  I am curious about using 6809 machine code in my GBasic Vectrex programs. Beyond using a code sprite, I am clueless. Back when I would do this on my Atari 800, I would put 6502 instructions into a string or array, the starting address of which was available to BASIC. Once I had the address of the string, I could instruct BASIC to run the code at that address. Is there a similar trick for the Vectrex?
   There's a nifty memory map over at playvectrex.com that shows $C800-$C880 are available to the programmer. Does the Vectrex32 use any of that?
   Thanks for reading!
   -L

Hi Bob, yes, I am talking about the Zektor vector graphics card. Apparently it could drive a vectrex display (and other displays like o-scopes, apparently.) I have one completely unused. It was a bit of an optimistic purchase, kind of like buying pants a few sizes too small

But I've recently started using my Vectrex32 cartridge in earnest, and happy about that.

Hello All! (Anyone out there? It's been a minute since this thread was active ;-)
I'm Lars, love the vectrex, missed it when it first came out, as I was in college and couldn't afford one, on top of my Atari 800 I saved up for. But I got one from eBay years ago and I'm thrilled.
Even more thrilled that there are projects like Vectrex32 and PiTrex now.
I have (but never used) a Zektor card. Are they still useful?