The 7485 (74LS85, 74HC85) is a digital magnitude comparator IC.
.--\/--.
B3 --+ +-- Vcc
IA<B --+ +-- A3
IA=B --+ +-- B2
IA>B --+ 85 +-- A2
QA>B --+ +-- A1
QA=B --+ +-- B1
QA<B --+ +-- A0
GND --+ +-- B0
`------'
If A is not equal to B, the cascading inputs have no effect.
This IC has been proposed as the PRG ROM decoder for NROM-368.
Categories: 7400 series