Solved!

I had the bias chain wired up backwards - VLCD3 was wired to the VSS end of
the chain, and VLCD1 ended up wired to VCC. Needless to say, the LCD
controller didn't like that...

Now I just need to find a way to deal with the display update code. The
segment ordering in LCDDATA[0:8] is a real mess, so I can't just use a jump
table and throw the data straight into the relevant register :(

Thanks.
-- 
Phil.                              | Acorn RiscPC600 SA220 64MB+6GB 100baseT
philpem@dsl.pipex.com              | Athlon64 3200+ A8VDeluxe R2 512MB+100GB
http://www.philpem.me.uk/          | Panasonic CF-25 Mk.2 Toughbook
... H2SO4 : Help, Help! Searing! Ouch, Ouch, Ouch, Ouch
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