Thanks for responding - sorry to hear you are unwell - I've not been following this thread for a while ( been getting other ancient hardware working ). But getting the old stuff out of the loft has been a godsend during this lock down. We have been shielding so not really left the house since March. If you do manage to find one that would be wonderful but I fully understand if not.
Hope you get better soon and are able to "work" on these ancient systems
Take care
David