T190-kk-ss-dd-e-fff
T190= MMI Model number; kk=Keyboard type; ss=screen type; dd=DIP board type; e=extended memory; fff=set of labels for standard keyboard

T191-nn-M1M2M3M4M5M6
T191= Modular I/O number; nn=box number/PBIF; Mn Module name/number in slot x

T192-nn-ex
T192= I/O Board model number; nn=I/O board number; ex=extension board number

T193-aaa-ee-fff
T193= Accessorie and kit model number; aaa= accessory name
-PCB PROBUS cable; ee=plug mounted; fff=cable length in metres
-SIC Serial interface cable; ee=connector type; fff=cable length in metres
-SPC Serial printer cable; ee=connector type; fff=cable length in metres
-FDK Floppy disk kit; ee=FD type; fff=cable length in centimetres
-IFK Interface Kit; ee=interface type; fff=cable length in centimetres
-EXK Extension Kits; ee=extension type
-ROM set of PROM's; ee=DIP type; fff=program version
-TBL set of Terminal blocks for Master I/O board; ee=Master I/O board number