Another story, the sad story of the intel chip (I think it was the 80188) where Intel made use of Int 5, which was documented as reserved. Unfortunately, Microsoft/IBM had used this for print screen or some such. Intel was absolutely right that their documentation was clear and it was wrong to have used these interrupts .. but the result was a warehouse of unused chips.
Not really. Just, no one used the BOUND instruction. All computers running DOS (Intel, AMD, even the old NEC V20/V30 chips) still connect INT 5 to Print Screen.
Paolo
