;
;	File:		802Equ.a
;
;	Contains:	Equates for IEEE network standards
;
;	Written by:	Kerry E. Lynn, Sean Findley
;
;	Copyright:	© 1990, 1992 by Apple Computer, Inc., all rights reserved.
;
;	Change History (most recent first):
;
;		 <1>	 10/6/92	GDW		New location for ROMLink tool.
;		 <1>	 3/26/92	FM		first checked in
;		 <1>	12/14/90	JK		Added to build
;
;	To Do:
;

;-----------=-----------=-------------------------------=---------------------------------------
; 802Equ.a - Equates for IEEE network standards
;
; Kerry E. Lynn
; Feb 1989
;
; Copyright (C) 1989 by:
;
;	Apple Computer, Inc.
;	20525 Mariani Ave.
;	Cupertino, CA  95014
;
; All Rights Reserved.
;-----------=-----------=-------------------------------=---------------------------------------

; 24-bit quantities, left justified

AppleCode	EQU	$08000700				; Apple's vendor code for 802.2 Individual addr
MultiCode	EQU	$09000700				; Apple's vendor code for 802.2 Group addr


; Size of a MAC addr

MACAddrSz	EQU	6						; max size (in bytes) for data link addr
MaxMCastSz	EQU	MACAddrSz				; max size (in bytes) for multicast addr

;---------------------------------------
; 802.3 MAC packet header
;---------------------------------------

MDstAddr	EQU	0						; Offset to destination address
MSrcAddr	EQU	MDstAddr+MACAddrSz		; Offset to source address
MLength		EQU	MSrcAddr+MACAddrSz		; Offset to LLC length
MHdrSize	EQU	MLength+2				; 802.3 MAC header size

;---------------------------------------
; 802.2 LLC (Type 1) packet header
;---------------------------------------

LDSAP		EQU	0						; Offset to destination Service Access Point (SAP)
IGBIT		EQU	0						; I/G = 0 if Individual DSAP, = 1 if Group DSAP

LSSAP		EQU	LDSAP+1					; Offset to source SAP
CRBIT		EQU	0						; C/R = 0 if Command, = 1 if Response

LCtrl		EQU	LSSAP+1					; Offset to LLC CONTROL field (see below)
LHdrSize	EQU	LCtrl+1

LInfo		EQU	LHdrSize				; Offset to LLC Information

GlobalSAP	EQU	$FF
NullSAP		EQU	0

;---------------------------------------
; CONTROL field bits for 802.2 Type 1 LLC Protocol Data Units (PDUs)
;---------------------------------------

UI			EQU	%00000011		; value for "Unnumbered Information" (P/F bit must be 0)
XID			EQU	%10101111		; mask for "Exchange Identification" (P/F bit may be 0 or 1)
TEST		EQU	%11100011		; mask for "Test" (P/F bit may be 0 or 1)

PFBIT		EQU	4				; P/F = 0 if Poll (command), = 1 if Final (response)

;---------------------------------------
; XID information field
;---------------------------------------

XIDformat	EQU	%10000001		; indicates IEEE basic format
XIDinfo1	EQU	%00000001		; indicates Type 1 AND Class I LLC
XIDinfo2	EQU	%00000000		; receive window size = N/A

XIDinfoSz	EQU	3				; number of bytes in an XID response

;---------------------------------------
; Sub-Network Access Protocol (SNAP) packet header
;---------------------------------------

SType		EQU	0						; 5-byte protocol discriminator
SHdrSize	EQU	SType+5