74c150

[Hugo Haesaert]

Hi Joerg, Paul and List !

The schemos for the TKB are at :

http://www.hyperreal.org/music/machines/manufacturers/Serge/schematic
s/

The 74c150 is still listed in the catalogue from a local electronics 
shop in Brussels Belgium . BEF 360, about DEM 18 or usd10 .

As this ic is part of the touchKBD and not the sequencer proper,  i 
suspect (gut feeling :) that using ttl for this is not on .  

Those keys, anyone with an explanation how these work here ?

Also, the pots are "fed" a voltage from two 4051's, why no 74c150 ?

Inversely, why no two 4051 for the kbd ?

My 1977 National cmos databook does not list the 4067 .  Did this 
part exist when the TKB was first built ?

More questions than answers :)

Keep 'em oscillating :)

Hugo
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