;
; Program: REG
; Author: Richard Conn
; Version: 1.0
; Date: 5 Mar 84
;
version	equ	10

;
;	REG is used to access the ZCPR3 Registers.  It can set a value,
; display a value or all values, increment, and decrement them.
;

;
; Equates for Key Values
;
z3env	SET	0f400h	;address of ZCPR3 environment
fcb	equ	5ch
fcb2	equ	6ch
cr	equ	0dh
lf	equ	0ah

;
; External Z3LIB and SYSLIB Routines
;
	ext	z3init,getreg,putreg,getmsg
	ext	eval10,print,cout,crlf,qprint,padc

;
; Environment Definition
;
	if	z3env ne 0
;
; External ZCPR3 Environment Descriptor
;
	jmp	start
	db	'Z3ENV'	;This is a ZCPR3 Utility
	db	1	;External Environment Descriptor
z3eadr:
	dw	z3env
start:
	lhld	z3eadr	;pt to ZCPR3 environment
;
	else
;
; Internal ZCPR3 Environment Descriptor
;
	MACLIB	Z3BASE.LIB
	MACLIB	SYSENV.LIB
z3eadr:
	jmp	start
	SYSENV
start:
	lxi	h,z3eadr	;pt to ZCPR3 environment
	endif

;
; Start of Program -- Initialize ZCPR3 Environment
;
	call	z3init	;initialize the ZCPR3 Environment
;
; Print Banner
;
	call	qprint
	db	'REG, Version '
	db	(version/10)+'0','.',(version mod 10)+'0',cr,lf,0
;
; Check for Availability of Registers
;
	call	getmsg
	jz	nomsg
;
; Check for Command
;
	lxi	h,fcb+1	;pt to first FCB
	mov	a,m	;get first char
	cpi	' '	;check for help
	jz	help
	cpi	'/'	;also help
	jz	help
	cpi	'#'	;display all
	jz	dispall
	cpi	'D'	;display
	jz	display
	cpi	'M'	;minus (decrement)
	jz	minus
	cpi	'P'	;plus (increment)
	jz	plus
	cpi	'S'	;set
	jz	setrg
	cpi	'0'	;convert to binary
	jc	help
	cpi	'9'+1	;range?
	jnc	help
	jmp	disp1

;
; Print Error Message
;
nomsg:
	call	print
	db	cr,lf,'No Registers Available',0
	ret

;
; Print Help Message
;
help:
	call	print
	db	cr,lf,'REG - Set/Display/Increment/Decrement Registers'
	db	cr,lf,'REG Syntax:'
	db	cr,lf,'	REG Dr or REG r	<-- Display Reg r'
	db	cr,lf,'	REG Mr		<-- Minus (Decrement) Reg r'
	db	cr,lf,'	REG Pr		<-- Plus (Increment) Reg r'
	db	cr,lf,'	REG Sr val	<-- Set Reg r to val'
	db	cr,lf,'where "r" may be 0-9 for the regs or'
	db	cr,lf,'# to select all regs'
	db	0
	ret
;
; Display Register
;
display:
	inx	h	;pt to value
	mov	a,m	;get it
disp1:
	cpi	'#'	;display all?
	jz	dispall
;
; Display Particular Register
;
	call	compreg	;compute register number in B
	call	getreg	;return register value in A
;
; Print Register whose Number is in B and Value in A
;
regprint:
	mov	c,a	;value in C
	call	print
	db	' Reg ',0
	mov	a,b
	adi	'0'	;convert to ASCII
	call	cout
	call	print
	db	' = ',0
	mov	a,c	;print value
	jmp	padc
;
; Display All Registers
;
dispall:
	mvi	b,0	;loop 0 to 9
dispa1:
	call	getreg	;get register
	call	regprint	;print register
	call	print
	db	'    ',0
	inr	b	;increment count
	mov	a,b	;check for new line
	ani	3
	cz	crlf
	mov	a,b	;check for done
	cpi	10
	jnz	dispa1
	ret
;
; Convert ASCII Char in A to Register Number in B with error check
;
compreg:
	cpi	'0'	;convert to binary
	jc	rerr
	cpi	'9'+1
	jnc	rerr
	sui	'0'	;convert to binary
	mov	b,a	;return value in B
	ret
rerr:
	mov	b,a	;save char
	pop	psw	;clear stack
	call	print
	db	' Invld Reg ID: ',0
	mov	a,b	;get char
	jmp	cout
;
; Set Register Value
;
setrg:
	inx	h	;pt to register
	mov	a,m	;get char
	cpi	'#'	;all registers?
	jz	setall
	call	compreg	;get register number in B
	lxi	h,fcb2+1	;pt to value
	call	eval10	;evaluate
	mov	c,a	;save value in C
	call	putreg	;set register
	jmp	regprint	;print value
;
; Set All Registers
;
setall:
	lxi	h,fcb2+1	;pt to value
	call	eval10
	mov	c,a	;value in C
	mvi	b,0	;set 10 registers
seta1:
	mov	a,c	;get value
	call	putreg	;set value
	inr	b	;increment reg number
	mov	a,b
	cpi	10
	jnz	seta1
	jmp	dispall	;display all registers
;
; Reg = Reg - 1
;
minus:
	inx	h	;pt to number
	mov	a,m	;get it
	cpi	'#'	;all?
	jz	minall
	call	compreg	;compute register number
	call	getreg	;get register
	dcr	a	;-1
	call	putreg	;restore register
	jmp	regprint	;print result
;
; All Registers - 1
;
minall:
	mvi	b,0	;set loop
mina1:
	call	getreg	;get register
	dcr	a	;-1
	call	putreg	;restore register
	inr	b	;count
	mov	a,b	;done?
	cpi	10
	jnz	mina1
	jmp	dispall	;display all regs
;
; Reg = Reg + 1
;
plus:
	inx	h	;pt to register
	mov	a,m	;get it
	cpi	'#'	;all?
	jz	plusall
	call	compreg	;compute value
	call	getreg	;get value
	inr	a	;+1
	call	putreg	;put value
	jmp	regprint	;print value
plusall:
	mvi	b,0	;set counter
plusa1:
	call	getreg	;increment value
	inr	a
	call	putreg
	inr	b	;count
	mov	a,b
	cpi	10
	jnz	plusa1
	jmp	dispall	;print reg values

	end