Video Toaster working on Minimig

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If anyone can give a more electrical lowlevel description of how the video toaster worked could help out making it a reality.

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What's "ISA" and "TBC" ..?
As for syncing to external video. It seems like a simple matter to produce "c_28m" signal with another DCM using "/XCLK" from the original Amiga video DB23 socket as input.

Btw, any documentation on how the Video Toaster actually works is the key. And I guess it may vary between different Amiga models.

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That was my first thought, but then ISA isn't used much in Amiga context. So it didn't make sense to me.

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@mongo:
In what way does it use the parallel port?
(how many signals?, speed?, onput? output?)

The core of video toaster doesn't seem that impossible to do entirely in HDL.

"original A2000 video slot is a 36 pin edge connector"
http://www.thule.no/haynie/systems/amiga2k/docs/video.txt

A4000 24-Bit Video Slot/Connector (36p+54p):
http://www.thule.no/haynie/systems/amiga4k/docs/a4000.not.txt

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Toaster 1.0 runs on a stock 2000, 2.0 would too, though pretty slow.  

Howcome Toaster 2.0 become slower in the same enviroment as Toaster 1.0 ..?