.sect .text; .sect .rom; .sect .data; .sect .bss .define begtext,begdata,begbss,syscal .define hol0,.reghp,.limhp,.trppc,.ignmask .define ERANGE,ESET,EHEAP,ECASE,EILLINS,EIDIVZ,EODDZ .extern _end ERANGE = 1 ESET = 2 EIDIVZ = 6 EHEAP = 17 EILLINS = 18 EODDZ = 19 ECASE = 20 .sect .text .data1 0353 .data1 0176 ! jmp to begtext in 2 bytes. Assembler generates 3 ! bytes. syscal: jmp 1f grow: jmp 2f jmp 2f .data2 -277, -277, -277, -277, -277, -277 2: mov ax,2088 1: int 5 jmp 1f .space 100 1: ret begtext: mov bx,sp mov cx,(bx) add bx,2 mov ax,cx inc ax shl ax,1 add ax,bx push ax push bx push cx xor bp,bp mov bx,_end mov cx,9 add bx,1024 shr bx,cl shl bx,cl call grow call _m_a_i_n call __exit .sect .data begdata: hol0: .data2 0,0 .data2 0,0 argv: .data2 3f envp: .data2 0 3: .asciz "PROGRAM" .reghp: .data2 endbss .limhp: .data2 endbss .ignmask: .data2 0 .trppc: .data2 0 .sect .bss begbss: