(/me is appending a reply to my own post, because it seems there's a time-limit on editing? (never knew that/why is there still an edit option present if I can't edit after said 120 minutes?)
So.. to sum up what i've been digging into further... it turns out that there's supposed to be a 26...
Since the link-format has changed since the last post, and because i'm searching about here for MZ-100 information, figured I'd sorta re-link the relevant post referenced in the last post here.
https://forum.vcfed.org/index.php?threads/the-mysterious-sharp-mz-100.9582/
Anyone know if CN11 or CN14 on the mainboard are for say IDE or SCSI drives? (Is wondering if a non-HDD enabled model could be 'upgraded' to one with a harddrive?