I found some 20/21 pin modchips...

have a look at this

it says '21 pin modchip' but then it also says 'suitable for 20 and 21 pin'

Can anyone shed some light on this? I'm really desperate for a 20 pin modboard...

Well, I for one am skeptical. It sure LOOKS like the typical 21-pin mod... and how can a 21-pin connector fit into a 20-pin slot, right? Also it seems to have the two solder spots in the upper right corner that two wires are supposed to be attached to (for 5v and the CD-ROM chip pin).

I wish I could give ya more concrete info.