LaserWriter 8
is a generic PostScript printer driver for networks! So it will not work via USB. Attach the printer via Ethernet.
About the Kyocera FS-1370DN
I found the following text from Kyocera, inside the original "CD image 1.0"
https://www.kyoceradocumentsolutions.at/index/service_downloads/downloadcenter.false.driver.FS1370DN._.DE.html(inside the document "readme" inside the folders "Mac OS X" -> "Drivers")
"Macintosh OS 9 is not officially supported for this product. However,
for basic printing support, the generic PPD that is included with OS 9
can be used. Typically, the generic PPD will automatically be selected
when installing a printer if a manufacturer's PPD is not provided."So, what you need to do after attaching your printer via Ethernet is to open LaserWriter 8 and create a new printer. As every PostScript printer needs additionally an PPD file, you have to choose "generic PPD" that appeares in the list and is provided by Apple itselve, as Kyocera is not offering any specific PPD for the FS-1370.
By the way; this generic PPD works with a lot of Printers that are not officially supported! In fact most PostScript able printers should work with it (at least basic functions (of course no specific sorting, tray selection, stitching etc.)