microprocessors - How to do Interfacing of Dot Matrix display with 8088 microprocessor using MDA-8086 Trainer?

Question

Below is given sample code of "Sequentially ON, the whole line of Dot Matrix from Up to Down and perform this operation continuously"

CODE     SEGMENT
ASSUME CS:CODE; DS:CODE; ES:CODE; SS:CODE
    CW  EQU  1EH
    PORTC   EQU     1CH
    PORTB   EQU     1AH
    PORTA   EQU     18H
    ORG     1000H
    MOV     AL,80H
    OUT     CW,AL
    MOV     AL,0FFH
    OUT     PORTC,AL
    MOV     AL,0FFH
    OUT     PORTB,AL
    MOV     AL,7FH
BACK:   OUT     PORTA,AL
    CALL    TIMER
    ROR     AL,1
    JMP     BACK
TIMER:      PUSH    CX
        MOV     CX,1
TIMER2:     PUSH    CX
        MOV     CX,0
TIMER1:     NOP
        NOP
        NOP
        LOOP    TIMER1
        POP     CX
        LOOP    TIMER2
        POP     CX
        RET
        CODE    ENDS
        END

I have to acheive the following: a) Sequentially ON, the whole line of Dot Matrix from Down to Up and perform this operation 5 times. b) Put on the diagonal LEDs. c) Display “X” on Dot Matrix.

Can anyone please help with this?