# Z8 Assembler code ``` code:0000000C code:0000000C ; =============== S U B R O U T I N E ======================================= code:0000000C code:0000000C code:0000000C ; public start code:0000000C start: code:0000000C code:0000000C ; FUNCTION CHUNK AT code:00000139 SIZE 00000016 BYTES code:0000000C code:0000000C ld p2m, #0 ; Port 2 mode register code:0000000F ld p3m, #1 ; Port 3 mode register code:00000012 ld p01m, #4 ; Ports 0-1 mode register code:00000015 ld ipr, #1Ch ; Interrupt priority register code:00000018 ld imr, #21h ; '!' ; Interrupt mask register code:0000001B ld R4, #0Fh code:0000001E ld R5, #0Fh code:00000021 ld R6, #0Fh code:00000024 srp #10h code:00000026 .rp 10h code:00000026 code:00000026 ; public Start code:00000026 Start: ; Program control flags code:00000026 clr flags code:00000028 ld spl, #40h ; '@' ; Stack pointer low byte code:0000002B clr irq ; Interrupt request register code:0000002D ei code:0000002E ld R32, #10h code:00000031 ld R31, #0Fh code:00000033 code:00000033 ; public zero code:00000033 zero: ; CODE XREF: start+2B↓j code:00000033 clr @R32 code:00000035 inc R32 code:00000037 djnz R31, zero code:00000039 ld p2, #0FFh ; Port 2 ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.hex-rays.com/9.0/user-guide/disassembler/disassembly-gallery/z8.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.