;__N8VDRIVER_______________________________________________________________________________________
;
;	N8 VIDEO DRIVER FOR ROMWBW
;
;__________________________________________________________________________________________________
;
;__________________________________________________________________________________________________
; DATA CONSTANTS
;__________________________________________________________________________________________________
;
;__________________________________________________________________________________________________
; BOARD INITIALIZATION
;__________________________________________________________________________________________________
;
N8V_INIT:
	; INIT TMS9918 HERE...
	CALL	PPK_INIT
	XOR	A
	RET
;	
;__________________________________________________________________________________________________
; CHARACTER I/O (CIO) DISPATCHER
;__________________________________________________________________________________________________
;
N8V_DISPCIO:
	LD	A,B	; GET REQUESTED FUNCTION
	AND	$0F	; ISOLATE SUB-FUNCTION
	JP	Z,PPK_READ
	DEC	A
	JR	Z,N8V_CIOOUT
	DEC	A
	JP	Z,PPK_STAT
	DEC	A
	JR	Z,N8V_CIOOST
	CALL	PANIC
;
N8V_CIOOUT:
	JP	N8V_VDAWRC
;
N8V_CIOOST:
	XOR	A
	INC	A
	RET
;	
;__________________________________________________________________________________________________
; VIDEO DISPLAY ADAPTER (VDA) DISPATCHER
;__________________________________________________________________________________________________
;
N8V_DISPVDA:
	LD	A,B		; GET REQUESTED FUNCTION
	AND	$0F		; ISOLATE SUB-FUNCTION

	JR	Z,N8V_VDAINI
	DEC	A
	JR	Z,N8V_VDAQRY
	DEC	A
	JR	Z,N8V_VDARES
	DEC	A
	JR	Z,N8V_VDASCS
	DEC	A
	JR	Z,N8V_VDASCP
	DEC	A
	JR	Z,N8V_VDASAT
	DEC	A
	JR	Z,N8V_VDASCO
	DEC	A
	JR	Z,N8V_VDAWRC
	DEC	A
	JR	Z,N8V_VDAFIL
	DEC	A
	JR	Z,N8V_VDASCR
	DEC	A
	JP	Z,PPK_STAT
	DEC	A
	JP	Z,PPK_FLUSH
	DEC	A
	JP	Z,PPK_READ
	CALL	PANIC

N8V_VDAINI:
	XOR	A
	RET

N8V_VDAQRY:
	CALL	PANIC
	
N8V_VDARES:
	JR	N8V_INIT
	
N8V_VDASCS:
	CALL	PANIC
	
N8V_VDASCP:
	XOR	A
	RET
	
N8V_VDASAT:
	CALL	PANIC
	
N8V_VDASCO:
	CALL	PANIC
	
N8V_VDAWRC:
	XOR	A
	RET
	
N8V_VDAFIL:
	XOR	A
	RET
	
N8V_VDASCR:
	XOR	A
	RET
;
;__________________________________________________________________________________________________
; IMBED COMMON PRALLEL PORT KEYBOARD DRIVER
;__________________________________________________________________________________________________
;
#INCLUDE "ppk.asm"
;
;__________________________________________________________________________________________________
; LOCAL DRIVER DATA
;__________________________________________________________________________________________________
;