Futurebasic/Language/Reference/push

PUSH statements Syntax PUSH(var) PUSH {BYTE|WORD|LONG}(address&) Description These statements put 1, 2 or 4 bytes onto the CPU stack, and adjust the stack pointer by a corresponding amount. PUSH is the opposite of POP. If you use the first syntax, the data is copied from var, which must be a variable. The number of bytes put onto the stack depends on the data type of var: "Image Was Here" (No other variable types are valid with PUSH(var).) If you use the second syntax, the data is copied from the memory which begins at address&, which must be a long integer expression or a POINTER variable. The number of bytes put onto the stack depends on which keyword you use: "Image Was Here" In CPU68k compiles, PUSH always adjusts the stack pointer by an even number of bytes. If you use PUSH(byteVar) or PUSH BYTE(address&) in a CPU68k compile, the stack pointer will be adjusted by 2 bytes, even though only one byte is copied from byteVar or address&. PUSH is meant for careful use by advanced programmers. Your system can crash if the stack pointer is not adjusted carefully. See Also POP