Hi.
I think I have the unit you're looking for in my hand. Standard computer Grey colour with Red coloured text. I dont know If I have the serial cable(s) for it though.
I'm in the UK, SE Hampshire. I bought it do do some Midi stuff with my Grand daughter a couple of years ago, but she didn't get the music course at College that she was originally looking for. It seemed to work when we tried to put a system together. Sadly we didn't get far for other reasons.
If you want it drop me a message. I'll accept a sensible offer and will post.
KR
Mick.
June 2022.