MSM82C51A Integrated Circuit - DIP28 - OKI Semiconductor

CP82C59A5 Integrated Circuit - DIP28 - Harris Semiconductor

28C64A-15 Integrated Circuit - DIP28 - OKI Semiconductor

CY7C199-20PC Integrated Circuit - DIP28 - Cypress Semiconductor

CY7C192-20PC Integrated Circuit - DIP28 - Cypress Semiconductor

CY7C199-20PXCR Integrated Circuit - DIP28 - Cypress Semiconductor

M82C59A-2 Integrated Circuit - DIP28 - OKI Semiconductor

CP82C59A Integrated Circuit - DIP28 - Harris Semiconductor