The following DEFCOMs in ZWEI got renamed somewhere during the development of System 99,, but the COMTABs where not update:

COM-SAVE-POSITION is now called COM-SAVE-POSITION-IN-REGISTER

COM-JUMP-TO-SAVED-POSITION is now called COM-JUMP-TO-REGISTER-POSITION

COM-START-KBD-MACRO is now called COM-START-KEYBOARD-MACRO
COM-END-KBD-MACRO is now called COM-END-KEYBOARD-MACRO 
COM-CALL-LAST-KBD-MACRO is now called COM-CALL-LAST-KEYBOARD-MACRO
COM-KBD-MACRO-QUERY is now called COM-KEYBOARD-MACRO-QUERY

INITIALIZE-STANDARD-COMTABS needs to be updated accordingly.