mona.asm

[org 0x7C00]
[bits 16]
    push 0xA000
    pop es
    mov si, $brush
    xor cx, cx

    mov ax, 0x0013
    int 0x10

    mov ebx, 0x7EC80000

part_loop:
    lodsw
    mov bx, ax

    mov bp, 64
    sub bp, cx
    shl bp, 5
    mov sp, bp

len_loop:
    shl ebx, 1
    jnc not_carry
    xor ebx, 0x04C11DB7
    mov dh, bl
    not_carry:

    and dh, 0x82
    je dir_00
    jpe dir_82
    js dir_80
    dir_02:
        inc al  
        jmp dir_end
    dir_82:
        dec al
        jmp dir_end
    dir_00:
        inc ah
        jmp dir_end 
    dir_80:
        dec ah  
    dir_end:

    and ax, 0x7F7F
    cmp ah, 96
    jae skip

    movzx di, ah
    movzx bp, al
    imul di, 320
    add di, bp
    mov bp, cx
    and bp, 3
    mov dl, byte[bp + color]
    mov [es:di], dl
    skip:

    dec sp
    jnz len_loop
    inc cx
    cmp cx, 64
    jl part_loop    
    jmp $

color:
    db 0x43, 0x42, 0x06, 0x00

brush:
    dw  0x030A, 0x37BE, 0x2F9B, 0x072B, 0x0E3C, 0xF59B, 0x8A91, 0x1B0B
    dw  0x0EBD, 0x9378, 0xB83E, 0xB05A, 0x70B5, 0x0280, 0xD0B1, 0x9CD2
    dw  0x2093, 0x209C, 0x3D11, 0x26D6, 0xDF19, 0x97F5, 0x90A3, 0xA347
    dw  0x8AF7, 0x0859, 0x29AD, 0xA32C, 0x7DFC, 0x0D7D, 0xD57A, 0x3051
    dw  0xD431, 0x542B, 0xB242, 0xB114, 0x8A96, 0x2914, 0xB0F1, 0x532C
    dw  0x0413, 0x0A09, 0x3EBB, 0xE916, 0x1877, 0xB8E2, 0xAC72, 0x80C7
    dw  0x5240, 0x8D3C, 0x3EAF, 0xAD63, 0x1E14, 0xB23D, 0x238F, 0xC07B
    dw  0xAF9D, 0x312E, 0x96CE, 0x25A7, 0x9E37, 0x2C44, 0x2BB9, 0x2139


times 510 - ($-$$) db 0
DB 0x55
DB 0xAA