TITLE	"Z3MSGH - Z3lib 4.0"
;================================================================
;   The Libraries, Version 4, (C) 1989 by Alpha Systems Corp.
;----------------------------------------------------------------
; Author  : Harold F. Bower
;		Derived from Z3MSGH.Z80 Ver 1.1 by Richard Conn
; Date    : 1 May 92
; Version : 1.3
; Module  : Z3MSGH
; Abstract: This module contains the routine PUTSHM which sets
;	the value of a specified shell message register with a
;	given value.  The Register value must be in 0..2.
; Revision:
;  1.3 -  2 May 92 - Abort if No ENV/Message Buffer.		HFB
;  1.2 - 15 Mar 87 - Original Ver 4 Release.			HFB
;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

;  Module Entry Points

	PUBLIC		PUTSHM

;  External References

	EXT		GETMSG, @PUT1

	.Z80
	CSEG
;===============================================================
; NAME - PUTSHM
; Entry:  B - Contains value of Shell Register (0..2)
;	  A - Contains value to place in "B" shell register
; Exit : - None, the specified register is changed
; Uses : - None
; Special Requirements: None
;===============================================================

PUTSHM:	PUSH	HL		;save HL
	PUSH	DE		;save DE
	PUSH	AF		;save value
	CALL	GETMSG		;get ptr to messages
	JR	Z,PUTSHX	;1.3 ..quit if No ENV/Msg Buffer
	LD	DE,13		;offset to registers
	ADD	HL,DE
	LD	E,B		;get register number
	JP	@PUT1		; ..Offset and save byte

PUTSHX:	POP	AF		;1.3 Restore Regs
	POP	DE		;1.3
	POP	HL		;1.3
	RET			;1.3 ..and return to caller

	END