Am2901

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4-bit ALU from the Am2900 series of processor chips. Similar function to 74188 or i3002 / MH3002.

Produced in the USSR under the designation KM1804VS1.

Table of functions

0 0 0 ADD R Plus S R ⊕ S ⊕ Carry
0 0 1 SUBR S Minus R R' ⊕ S ⊕ Carry
0 1 0 SUBS R Minus S R ⊕ S' ⊕ Carry
0 1 1 OR R OR S (R' ∧ S') ⊕ 1
1 0 0 AND R AND S R ∧ S
1 0 1 NOTRS R' AND S R' ∧ S
1 1 0 EXOR R EX OR S R ⊕ S' ⊕ 1
1 1 1 EXNOR R EX NOR S R' ⊕ S' ⊕ 1

References

http://www.righto.com/2020/04/inside-am2901-amds-1970s-bit-slice.html (WebArchive)