52 PUSH AX;
53 Save AX Register to stack.
60    PUSH AX
64 MOVW AX, usCriticalNesting;  variable
66    PUSH AX
67 MOVW AX, pxCurrentTCB;  variable
69    MOVW HL, AX
70 MOVW AX, SP  variable
71         MOVW[ HL ], AX
89 MOVW AX, pxCurrentTCB;
91    MOVW HL, AX
92 MOVW AX, [ HL ]  variable
93 MOVW SP, AX
94 POP AX;  variable
96    MOVW usCriticalNesting, AX
100 POP AX;  variable
108    POP AX;  variable
109 Restore AX.