there was a mountlist entry. Mount command had to be issued before the Ram Disk could be used. Regular Workbench (at least 1.3.x) startup-sequence did this.
That's not true. At least in 1.2 and 1.3 the same mechanism as in 2.0 was used. With the only difference that ram-handler was loaded from disk and if it was not there, the attempt to access RAM: failed. But you didn't need to mount it explicitely.
The same is true for SER: and PAR: and port-handler. And for PRT: and printer.device. Only OS4.0 introduced external mount files for SER, PAR and PRT.
Bye,
Thomas