.sect .text; .sect .rom; .sect .data; .sect .bss .sect .text .define .rck ! descriptor address in bx ! value in ax, must be left there .rck: cmp ax,(bx) jl 2f cmp ax,2(bx) jg 2f ret 2: push ax .extern ERANGE .extern .error mov ax,ERANGE call .error pop ax ret