;  PROGRAM: ZMO-SN05.Z80
;  AUTHOR:  Richard Kopplin
;  VERSION: 1.5
;  DATE:  25 Oct, 1988
;-----------------------------------------------------------------------
;	This overlay is set up for a Sanyo MBC-1200/1250
;		UART 8251	NO baud rate generator
;-----------------------------------------------------------------------
; 89/04/12 - Modified to ZMP v1.5		- George Conover
; 89/03/15 - Removed the beginning remarks to make the file
;            smaller. If you need the remarks there are in the
;            file ZMP-BLNK.Z80 			- George Conover
; 89/03/14 - Modified to ZMP v1.4		- George Conover
; 88/10/10 - Modified to ZMP v1.3		- Ron Murray
; 88/09/15 - Modified to ZMP v1.2		- Ron Murray
; 88/09/14 - First version of this file		- Richard Kopplin
;
;	Written by - Richard Kopplin, 805-486-6847, Port Hueneme, CA
;-----------------------------------------------------------------------
; NOTES: On use of ZMP with the Sanyo MBC-1200/1250
;	Although the Sanyo has no baud rate generator the program will select
; between 300 or 1200 baud. To get 300 you must select 300 any other baud 
; rate will program the UART for 1200. Selection of 1 or 2 stop bits, Odd
; Even or No parity and 7 or 8 bit selection is also enabled. This feature
; can be disabled by deleting the call to "init2" in the "init" routine.
;	The "userin:" routine redefines the Sanyo function keys, "userout:"
; restores the orginal Sanyo function keys when exiting ZMP. The definition
; table for the function keys while in ZMP is located in the "newkeys:" area
; just below "userout:".
;	I could not get the screen print funciton to work with my printer.
; although if you had the "right" printer I'am sure it would work. What I did
; add here is a one line message with the overlay date and version.
;
;============================================================================
; User-set variables:

CLKSPD	EQU	4	; Processor clock speed in MHz

;Set the following two equates to the drive and user area which will contain
;   ZMP's .OVR files, .CFG file, .FON file and .HLP file. Set both to zero
;   (null) to locate them on the drive from which ZMP was invoked.

OVERDRIVE	EQU	'A'	; Drive to find overlay files on ('A'-'P')
OVERUSER	EQU	0	; User area to find files

;------------------------------------------------------------------------------

MDDATA  EQU	0ECH	; Modem data port for the Sanyo MBC-1200/1250
MDCTRL  EQU	0EDH	; the UART is an 8251, no baud rate control.

;============================================================================
; NOT user-set variables

USERDEF	EQU	0145H	; Origin of this overlay.  This address may
			; change with subsequent revisions.
MSPEED	EQU	05CH		; location of current baud rate. 
OVSIZE	EQU	0400H		; max size of this overlay

ESC	EQU	1BH
CR	EQU	0DH
LF	EQU	0AH
BDOS	EQU	5

	.Z80			; use z80 code
	ASEG			; absolute
	ORG	USERDEF

CODEBGN	EQU	$

;Jump table for the overlay: do NOT change this
JUMPTAB:
	JP	SCRNPR		; screen print
	JP	MRD		; modem read with timeout
	JP	MCHIN		; get a character from modem
	JP	MCHOUT		; send a character to the modem
	JP	MORDY		; test for tx buffer empty
	JP	MIRDY		; test for character received
	JP	SNDBRK		; send break
	JP	CURSADD		; cursor addressing
	JP	CLS		; clear screen
	JP	INVON		; inverse video on
	JP	INVOFF		; inverse video off
	JP	HIDE		; hide cursor
	JP	SHOW		; show cursor
	JP	SAVECU		; save cursor position
	JP	RESCU		; restore cursor position
	JP	MINT		; service modem interrupt
	JP	INVEC		; initialise interrupt vectors
	JP	DINVEC		; de-initialise interrupt vectors
	JP	MDMERR		; test uart flags for error
	JP	DTRON		; turn DTR on
	JP	DTROFF		; turn DTR OFF
	JP	INIT		; initialise uart
	JP	WAIT		; wait seconds
	JP	MSWAIT		; wait milliseconds
	JP	USERIN		; user-defined entry routine
	JP	USEROUT		; user-defined exit routine
	JP	GETVARS		; get system variables
  	JP	SETPORT		; Set port (0 or 1)
;
; Spare jumps for compatibility with future versions
;
	JP	SPARE		; spare for later use
	JP	SPARE		; spare for later use
	JP	SPARE		; spare for later use
	JP	SPARE		; spare for later use
	JP	SPARE		; spare for later use
	JP	SPARE		; spare for later use

;============================================================================
; Main code starts here
;
;Screen print function
SCRNPR:
	CALL	PRINT
	DB	'Zmodem v1.5 overlay for Sanyo MBC-1200/1250 '
	DB	' v0.1  dated  25 October 1988',CR,LF
	DB	'Print screen function is not supported.',CR,LF,0
SPARE:
	RET		; This ret used by both scrnpr and spare

; User-defined entry routine: 
; Install a new function key table for the Sanyo MBC-1200/1250
USERIN:
	LD	HL,(0001H)	; Load address of warm boot
	LD	BC,0030H	; add offset for keytable
	ADD	HL,BC
	LD	BC,NEWKEYS	; load address of new key table
	LD	E,(HL)		; store normal keytable in de
	LD	(HL),C
	INC	HL
	LD	D,(HL)
	LD	(HL),B
	LD	(KEYADD),DE	; store address for normal keytable
	RET

; User-defined exit routine: Reinstall normal function key table
USEROUT:
	LD	HL,(0001H)	; Load address of warm boot
	LD	BC,0030H	; add offset for keytable address
	ADD	HL,BC
	LD	BC,(KEYADD)	; load address of normal keytable
	LD	(HL),C		; and restore it in BIOS
	INC	HL
	LD	(HL),B	
	RET

KEYADD: DW 0			; Temp storage of normal keytable address
NEWKEYS:
	DB 08H,0,0,0,0,0,0,0	; Brown "INS" key
	DB CR, 0,0,0,0,0,0,0	; Brown "ENTER" key
	DB ESC,'1',0,0,0,0,0,0	; PF1 - Macro key 1
	DB ESC,'2',0,0,0,0,0,0	; PF2 - Macro key 2
	DB ESC,'3',0,0,0,0,0,0	; PF3 - Macro key 3
	DB ESC,'4',0,0,0,0,0,0	; PF4 - Macro key 4
	DB ESC,'5',0,0,0,0,0,0	; PF5 - Macro key 5
	DB ESC,'6',0,0,0,0,0,0	; PF6 - Macro key 6
	DB ESC,'7',0,0,0,0,0,0	; PF7 - Macro key 7
	DB ESC,'8',0,0,0,0,0,0	; PF8 - Macro key 8
	DB ESC,'9',0,0,0,0,0,0	; PF9 - Macro key 9
	DB ESC,'0',0,0,0,0,0,0	; PF10 - Macro key 0
	DB ESC,'K',0,0,0,0,0,0	; PF11 - Display keyboard macros
	DB ESC,'F',0,0,0,0,0,0	; PF12 - Disk Operation
	DB ESC,'D',0,0,0,0,0,0	; PF13 - Disk Directory
	DB ESC,'H',0,0,0,0,0,0	; PF14 - HELP
	DB ESC,'Q',0,0,0,0,0,0	; PF15 - Quit/Exit program
	DB ESC,'Z',0,0,0,0,0,0	; Left arrow - Clear Screen 
	DB ESC,'M',0,0,0,0,0,0	; Right arrow - Toggle capture mode 
	DB 'Q'-40H,0,0,0,0,0,0,0	; Up arrow  -   ctrl Q
	DB 'S'-40H,0,0,0,0,0,0,0	; Down arrow  -   ctrl S
	DB 'C'-40H,0,0,0,0,0,0,0	; Left/up arrow -   ctrl C

;============================================================================
;    Modem control area:   UART 8251  No baud rate generator
;  -------------------------------------------------
;  | DSR | syn |  FE |  OE |  PE | TxE | RxR | TxR |  Stauts format
;  -------------------------------------------------
;  | EH  | IR  | RTS |  ER | SBRK| RxE | DTR | TxE |  Command format
;  -------------------------------------------------
;  | S2  | S1  |  EP | PEN |  L2 |  L1 |  B2 |  B1 |  Commands
;  -------------------------------------------------
;   
;  S2 S1 Bits   EP      PEN         L2 L1 Bits   B2 B1 Rate
;   0  0  ?     0 Odd	0 Disable    0  0  5      0  0   ?
;   0  1  1     1 Even  1 Enable     0  1  6      0  1  X1
;   1  0  1.5                        1  0  7      1  0  X16
;   1  1  2                          1  1  8      1  1  X64
;
;Get a character from the modem: return in HL
MCHIN:				; <== Insert your own code here
	IN	A,(MDDATA)
				; <== End of your own code
	LD	L,A		; put in HL
	LD	H,0
	OR	A		; set/clear Z
	RET

;Send a character to the modem
MCHOUT:
	LD	HL,2		; get the character
	ADD	HL,SP
	LD	A,(HL)
				; <== Insert your own code here
	OUT	(MDDATA),A
				; <== End of your own code
	RET			; done

;Test for output ready: return TRUE (1) in HL if ok
MORDY:				; <== Insert your own code here
	LD	HL,0
	IN	A,(MDCTRL)
	BIT	0,A
	JR	Z,MORDY1
	INC	HL
				; <== End of your own code
MORDY1: LD	A,L		; set/clear Z
	OR	A
	RET

;Test for character at modem: return TRUE (1) in HL if so
MIRDY:				; <== Insert your own code here
	LD	HL,0
	IN	A,(MDCTRL)
	BIT	1,A
	JR	Z,MINDY1
	INC	HL
				; <== End of your own code
MINDY1: LD	A,L		; set/clear Z
	OR	A
	RET

;Send a break to the modem: leave empty if your system can't do it
SNDBRK:
	LD	A,00001000B
	OUT	(MDCTRL),A
	LD	HL,300		; wait 300 mS
	CALL	WAITHLMS
	LD	A,00110111B
	OUT	(MDCTRL),A
	RET

;Test UART flags for error: return TRUE (1) in HL if error.
MDMERR:				; <== Insert your own code here
	LD	HL,0
	IN	A,(MDCTRL)
	BIT	4,A
	JR	Z,MDMER1
	LD	A,00110111B	; if error reset UART
	OUT	(MDCTRL),A
	INC	HL
				; <== End of your own code
MDMER1: LD	A,L		; set/clear Z
	OR	A
	RET

;Turn DTR ON
DTRON:
	LD	A,00110111B
	OUT	(MDCTRL),A
	RET

;Turn DTR OFF
DTROFF:
	LD	A,00110101B
	OUT	(MDCTRL),A
	RET

;Initialise the uart
INIT:
	LD	HL,2		; get parameters
	ADD	HL,SP
	EX	DE,HL
	CALL	GETPARM		; in HL and save it in ..
	LD	(BRATE),HL	; baud rate
	CALL	GETPARM
	LD	(PARITY),HL	; parity
	CALL	GETPARM
	LD	(DATA),HL	; data bits (BINARY 7 or 8)
	CALL	GETPARM
	LD	(STOP),HL	; stop bits (BINARY 1 or 2)
				; <== Insert your own code here
	LD	A,5		; load mspeed with the current (default)
	LD	(MSPEED),A	; brate value if the new rate is valid
	LD	A,01000010B	; reset 8251 and leave DTR on
	OUT	(MDCTRL),A
	LD	A,01001110B	; 1 stop bit, parity disabled, 8 bits, X16
	CALL	INIT2		; change UART default settings 
	OUT	(MDCTRL),A
	LD	A,00110111B	; FIX, no reset, RTS on, Error reset,
	OUT	(MDCTRL),A	; no break, RX enable, DTR on, TX enable
	RET			; <== End of your own code

; Change default UART settings to those set by ZMP escape commands
INIT2:
	LD	E,A		; save default settings 01001110b
	LD	A,(BRATE)
	CP	1		; if 300 baud; set bit 0, X64
	JR	NZ,INIT3
	SET	0,E
	LD	(MSPEED),A	; change mspeed value for new baud rate
INIT3:
	LD	A,(DATA)
	CP	7		; if 7 data bits; reset bit 2
	JR	NZ,INIT4
	RES	2,E
INIT4:
	LD	A,(PARITY)
	CP	'O'		; if Odd parity; set bit 4, reset bit 5
	JR	NZ,INIT5
	SET	4,E
	RES	5,E
INIT5:
	CP	'E'		; if Even parity; set bits 4 and 5
	JR	NZ,INIT6
	SET	4,E
	SET	5,E
INIT6:
	LD	A,(STOP)
	CP	2		; if 2 stop bits; set bit 7
	JR	NZ,INIT7
	SET	7,E
INIT7:
	LD	A,E		; load new mode back in register a
	RET

;--------------------------------------------------------------------------

STOP:	DW	1		; stop bits:  1 or 2
PARITY:	DW	'N'		; parity:     N, O or E
DATA:	DW	8		; data bits:  7 or 8
BRATE:	DW	5		; baud rate:  see below

;--------------------------------------------------------------------------
; Values of brate for each baud rate allowed
;
; brate   baud rate       brate   baud rate       brate   baud rate
;   0        110            5       1200            9       19200
;   1        300            6       2400           10       38400
;   2        450            7       4800           11       57600
;   3        600            8       9600           12       76800
;   4        710
;
; Set the port. ZMP supplies either 0 or 1 as a parameter.
;
setport:
	ld	hl,2		; get port number
	add	hl,sp
	ex	de,hl
	call	getparm		; in HL (values are 0 and 1)

				; <== Insert your own code here

				; <== End of your own code
	ret
;
;============================================================================
;	Video terminal sequences for the Sanyo MBC-1200/1250
;Cursor addressing: 
CURSADD:
	LD	HL,2		; get parameters
	ADD	HL,SP
	EX	DE,HL
	CALL	GETPARM		; in HL
	LD	(ROW),HL	; row
	CALL	GETPARM
	LD	(COL),HL	; column
				; <== Insert your own code here
				; using values in row and col
	CALL	PRINT
	DB	ESC,'=',0	; Sanyo leadin characters
	LD	A,(ROW)		; row first
	ADD	A,' '		; add offset
	CALL	COUT
	LD	A,(COL)		; same for column
	ADD	A,' '
	CALL	COUT
				; <== end of your own code
	RET

ROW:	DW	0		; row
COL:	DW	0		; column

;Clear screen:
CLS:
	CALL	PRINT
	DB	1AH,0
	RET

;Inverse video on:
INVON:
	CALL	PRINT
	DB	ESC,'t4',0
	RET

;Inverse video off:
INVOFF:
	CALL	PRINT
	DB	ESC,'t0',0
	RET

;Turn off cursor:
HIDE:
	CALL	PRINT
	DB	ESC,'E',0
	RET

;Turn on cursor:
SHOW:
	CALL	PRINT
	DB	ESC,'D',0
	RET

;Save cursor position:
SAVECU:
	RET

;Restore cursor position:
RESCU:
	RET

;****************************************************************************

;Service modem interrupt:
MINT:
	RET			; Not used by the Sanyo MBC-1200/1250

;Initialise interrupt vectors:
INVEC:
	RET			; ditto

;De-initialise interrupt vectors:
DINVEC:
	RET			; ditto

;****************** End of user-defined code ********************************
;		Do not change anything below here.

;Modem character test for 100 ms
MRD:
	PUSH	BC		; save bc
	LD	BC,100		; set limit
MRD1:
	CALL	MIRDY		; char at modem?
	JR	NZ,MRD2		; yes, exit
	LD	HL,1		; else wait 1ms
	CALL	WAITHLMS
	DEC	BC		; loop till done
	LD	A,B
	OR	C
	JR	NZ,MRD1
	LD	HL,0		; none there, result=0
	XOR	A
MRD2:
	POP	BC
	RET

; Inline print routine: destroys A and HL
PRINT:
	EX	(SP),HL		; get address of string
PLOOP:
	LD	A,(HL)		; get next
	INC	HL		; bump pointer
	OR	A		; done if zero
	JR	Z,PDONE
	CALL	COUT		; else print
	JR	PLOOP		; and loop
PDONE:
	EX	(SP),HL		; restore return address
	RET			; and quit

;Output a character in A to the console
COUT:
	PUSH	BC		; save regs
	PUSH	DE
	PUSH	HL
	LD	E,A		; character to E
	LD	C,2
	CALL	BDOS		; print it
	POP	HL
	POP	DE
	POP	BC
	RET

; Wait(seconds)
WAIT:
	LD	HL,2
	ADD	HL,SP
	EX	DE,HL		; get delay size
	CALL	GETPARM
				; fall thru to..
; Wait seconds in HL
WAITHLS:
	PUSH	BC		; save bc
	PUSH	DE		; de
	PUSH	IX		; and ix
	LD	IX,0		; then point ix to 0
				; so we don't upset memory-mapped i/o

; Calculate values for loop constants. Need to have two loops to avoid
;   16-bit overflow with clock speeds above 9 MHz.

OUTERVAL	EQU	(CLKSPD / 10) + 1
INNERVAL	EQU	(6667 / OUTERVAL) * CLKSPD

WAIT10:
	LD	B,OUTERVAL

WAIT11:
	LD	DE,INNERVAL

WAIT12:
	BIT	0,(IX)		; time-wasters
	BIT	0,(IX)
	BIT	0,(IX)		; 20 T-states each
	BIT	0,(IX)
	BIT	0,(IX)
	BIT	0,(IX)
	DEC	DE
	LD	A,E
	LD	A,D
	OR	E
	JR	NZ,WAIT12	; 150 T-states per inner loop
	DJNZ	WAIT11		; decrement outer loop
	DEC	HL		; ok, decrement count in hl
	LD	A,H
	OR	L
	JR	NZ,WAIT10
	POP	IX		; done -- restore ix
	POP	DE		; de
	POP	BC		; and bc
	RET

; Wait milliseconds
MSWAIT:
	LD	HL,2
	ADD	HL,SP
	EX	DE,HL		; get delay size
	CALL	GETPARM
				; fall thru to..
; Wait milliseconds in HL
WAITHLMS:
	PUSH	DE
W1MS0:
	LD	DE,39 * CLKSPD
W1MS1:
	DEC	DE
	LD	A,D
	OR	E
	JR	NZ,W1MS1
	DEC	HL
	LD	A,H
	OR	L
	JR	NZ,W1MS0
	POP	DE
	RET

; Get next parameter from (de) into hl
GETPARM:
	EX	DE,HL		; get address into hl
	LD	E,(HL)		; get lo
	INC	HL
	LD	D,(HL)		; then hi
	INC	HL		; bump for next
	EX	DE,HL		; result in hl, address still in de
	RET
;
;Get address of user-defined variables
;
GETVARS:
	LD	HL,USERVARS
	RET
USERVARS:
	DW	OVERDRIVE	; .OVR etc. drive/user
	DW	OVERUSER

USED:	EQU	($ - USERDEF)
UNUSED: EQU	OVSIZE - USED
	 IF	($ - USERDEF) GT OVSIZE
TOOBIG:	JP	ERRVAL		; Overlay too large!
	 ENDIF

	END