If you would like to have some code to try with, have a look at this:
''mov ah, 0x02
''mov dl, "J" = 74
''Int 21h
''ret
WriteByte(o, 180)
WriteByte(o, 2)
WriteByte(o, 178)
WriteByte(o, 74)
WriteByte(o, 205)
WriteByte(o, 33)
WriteByte(o, 195)
The first part is the asm code correspondent, the second one contains the byte numbers(written as integer) to obtain that code.
''mov ah, 0x02
''mov dl, "J" = 74
''Int 21h
''ret
WriteByte(o, 180)
WriteByte(o, 2)
WriteByte(o, 178)
WriteByte(o, 74)
WriteByte(o, 205)
WriteByte(o, 33)
WriteByte(o, 195)
The first part is the asm code correspondent, the second one contains the byte numbers(written as integer) to obtain that code.