old TI 305 programming

Hi all,
Working on an old TI 305 plc installed on a machine, trying to troubleshoot. I am using the manual for the 305 from Automation Direct for the most part, but have many "SR" coils - set and reset in the logic.

Example- CT623 = K9 -------- SET (SR412)

The manual calls out for shift registers, but there are none configured in the classic style. Could these be some "special relay"? If so, do they differ from the "C" relays? These are used in the logic to set or reset as a count increases to a specified level.
Any explanations appreciated.

Thanks, tommy23t

Tommy23t,
Had this same problem a few years back and found out that with the 305 you can use SR as a normal internal coil as long as there are no shift registers in the program.

Here is the thread:

http://www.plctalk.net/qanda/showthread.php?t=45769

Thanks, Scooter
That answered my question. Seems like you were mystified as well.

tommy23t