the solution I learnt from research is that some clever folks found that one can cut away the packaging to expose hidden pins that give access to the battery power terminals - and then hack on a button battery such as a CR2032! The problem is that these units have a built-in battery and they eventually die. I decided to use a period part from the day, the Dallas DS12887 which was found on most PCs in the early-mid 80s. After using the filesystem for a while it becomes obvious that one needs the timestamp on files. I wasn't that bothered about adding a realtime clock until I had got to being 'almost complete' with the FAT16 handling. The most recent update is about the real-time clock. I will try to keep this section of the hackaday site going with short updates for any interested folks.
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