SY6545-1 CRT controller by Synertek. Package: 40 pin DIP Download Synertek SY6545 -1 datasheet: Status: NOS (New Old Stock) logo's a bit worn ...these are now approaching 40 years old ! Individually Tested components: YES RoHS compliant: no One for the early computer restorers... Atari & TSR80 Very adaptable, includes light pen detection circuitry.