need interface to CDC Keystone (92185) tape drive

Hello, I was referred by a member, Peter Wallace. We are trying to recover some programs from 9-track backup tapes. I have a working 92185 drive, and had salvaged a SCSI - Pertec formatted interface converter off the back of a Cipher 990 drive at work. The Cipher 990 was total crap, hardly ever worked. The SCSI converter actually worked for a while, I was able to read a few blocks of tape (without a proper program to handle the format, I just did stuff like sudo cat /dev/st0 on a linux system, and got info that looked like the first couple records off a tape. Then, the converter died, it stopped passing its internal self test. But, I had proved the 92185 drive is OK. So, now I'm looking for a way to read these tapes. The best solution would be an off-the-shelf SCSI - Pertec converter, which were made some years ago, but will be hard to find on eBay or such. Another way is to find the SCSI interface board for the 92185, but I've never found one to buy. Another way is to get my Vaxstation running again, the hard drive blew, so it would take some effort to get that back up. I have a Dilog DQ15 controller for it, and if that won't work, I probably have another tape controller, too. Another problem with the VAX is I'd have pull all the data off the tape over a serial interface, it was last running VMS 4.7 without TCP networking. Anybody got any goodies in the basement, any good ideas of how to interface it, etc.? One other choice is to build my own FPGA Pertec interface. The formatted Pertec interface is about as simple as you could imagine, but I'd need to add an SRAM buffer to the FPGA to handle up to 64K byte blocks. Jon