User manuals are sorted by product serial number and model codes. The first 4 digits of the serial number represent the manufacture date (YYMM) eg, 2203-XXXX = March 2022 build date.
Models: TI-20F, TI-50F, TI-80F, TI-120F, TI-280F
March 2022 - September 2023 (2203-2309)
October 2023 - current (2310 - current)
Models: TI-520F-SD/GD, TI-1100F-SD/GD
October 2023 - current (2310 - current)
Model: TMLR-200
October 2023 - November 2023 (2310 - 2311)
December 2023 - current (2312 - current)
Model: TRI-145-1-SD/GD, TRI-520F-1-SD/GD, TRI-1100F-2-SD/GD
October 2023 - current (2310 - current)