Can someone post a pic of this mystical Mechware card reader?
Not mystical at all, i sold them here for 3-4 years:
https://web.archive.org/web/20130924003304/http://a4000t.com:80/store/index.php?main_page=index&cPath=68Sold roughly 2000 card readers in a few years. sadly very few amiga people bought them,it was mostly sampler users oveseas. i actually sold them cheaper than going prices then.
the pcd-25B (2 slots,mounts as 2 scsi id#'s)not listed there but i had only a few for sale early on.
the pcd-47b was a 3 slot model, it uses 3 scsi ID#'s one for each slot.
the pcd-50b is a 5 slot model, it uses LUNS for all but the pcmcia slot which is lun0 technically.
there are quite a few other models that are more uncommon, PCD-15,PCD17,
same with the pcd-60b, its a 6 slot model,works same as the pcd-50b with LUNS
You could use a pcmcia to cf adaper in the pcmcia slots. All slots bootable if the scsi controller allows.