I had a spare hu850 (not working) which I have got the following identification for the integrated circuits on the main board. Sadly it looks like the audio switching is handled by a microprocessor rather than a discrete chip...
Ic51 - mcu?
mc908a260acfu
2l87j
Qqaq0417
7c
Ic801 - ?
Nec d0703035aygc
M12
0450kp001
Ic101 - voltage reg?
ti lm053a
44k
047d
Ic102 - dual op amp?
4565
436
Jrc
Ic370 - dual op amp?
2904
4294
Jrc
Ic37 - quad op amp?
2902
4294
Jrc
Ic803 - flash?
L02
4t52w
Ic52 - canbus txr
Philips tja1040
4k135
4441y
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