Category: <b>hardware</b>
<br>Flags: callout or callback (usually hooked rather than called)<p>
<pre><b>INT 77 - IRQ15 - RESERVED (AT,PS)</b>

Notes:	may be masked by setting bit 7 on I/O port A1h
	DOS 3.3+ revectors IRQ15 to a stack-switching routine unless STACKS=0
	  has been set in CONFIG.SYS.  MS/PC-DOS use the IBM Interrupt Sharing
	  Protocol (see <a href=../../it/68/25.html>#02568</a>) when hooking this IRQ
SeeAlso: INT 5F"IRQ15",MEM 0040h:006Bh
</pre>