The IR remote control to CAT seems to be by KE8WO
Files.
It's for a Sony remote, but the source seems to be BASIC and the RC6 used by many IR remotes is well documented. I wrote SW to learn an RC6 remote on a PC via IR RX on RS232 handshake and transmitt IR using LED and 555 timer for 38 kHz turned on/off by HS pin. Then a Philips Photo/Portfolio CD could be used to control anything.
Then that info programmed in JAL for a standalone box with other features.