Decimal Multiplicative Adder

[Apocryphan]

1 interesting detail i failed to mention is that this can easily be changed to add/multiply in any counting base except hex (requires more logic to get an imaginary number 16 but ive got another design for hex) simply by changing the value in 2 of the hoppers for each adder digit. Base 2 (binary) up to base 15.






And here is a Pic of the hex multiplier, not as sleek and compact, and it is actually around 18 ticks per add, so it's almost half the speed too but it can accurately multiply in hexadecimal