On 30 Jun 2021, at 00:44, noel.hunt@gmail.com wrote:
The source file in question is 'gcalloc.c' and it seems to be in sam
source as late as 10th Edition. From a perusal of research source, it
seems to have been used in jim, sam, pads, mux amongst others.

Right, thank you for that - forgot sources were available via list.

Will examine closely

Silas