27C256 28 32K LK5 (A15=VCC=High) LK4 (A17=VCC=Supply) N/A
27C512 28 64K LK6 (A15=A15=Address) LK4 (A17=VCC=Supply) N/A
27C1001 32 128K LK6 (A15=A15=Address) N/A LK1 (A18=VCC=/PGM) N/A
27C2001 32 256K LK6 (A15=A15=Address) LK3 (A17=A17=Address) LK1 (A18=VCC=/PGM)
27C4001 32 512K LK6 (A15=A15=Address) LK3 (A17=A17=Address) LK2 (A18=A18=Address)