I have managed to get this working by using a 4050 CMOS buffer chip as
indicated by Trev Jackson. I will write this up a bit later with some
pictures for anyone else who wants to do the same thing, it might be
useful for those like me who don't have much in the way of electronics
skills.
In the meantime I have posted some random captures here:
http://www.blushingpenguin.com/mark/lmilk/
They were generated by running the BlasterCfg (the disgusting looking VB
application that doesn't have the tab order set properly) from the
hauppage software.
I haven't looked at them properly yet. The device at 0x71 is the known
IR receiver device that is already supported in LIRC being polled, and
therefore pretty obviously the transmitter has address 0x70.
If anyone can make any sense of that lot or would like captures under
different circumstances then let me know and I'll be happy to provide them.
Thanks,
Mark
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