The UC1842AY from Microchip Technology is a boost, buck, flyback and forward DC-DC controller Integrated Circuit with isolation capable step-up and step-down output, in an 8-CERDIP package.
The UC1842AJ883B from Unitrode is a current-mode DC-DC switching controller Integrated Circuit for boost, buck, flyback and forward topologies, with positive regulator, isolation-capable output and step-up/step-down operation, in an 8-CDIP package.