hello.asm

.text
    # S0 = 0xb8000
    lui  $s0, 0xb;
    ori $s0, $s0, 0x8000 
    # S1 = 3937, ASCII codepoint: 'a', FG: white, BG: black, Blink: 0
    ori $s1, $zero, 3937
    # RAM[0xb8000] = 3937
    sw $s1, 0($s0)

    # infinite loop
    loop:
        nop
        j loop