Based on the memory map above, the ISR is at address  if 8088 receives an INT 40 request.

0000:0090 00 12 56 23 DE 7A 00 00 10 E1 30 00 1A FF EF A1 0000:00AO 10 00 00 E1 91 3037 B1 CA 52 87 A0 9032 FA 56 0000:00BO 20 00 00 E1 91 45 A0 E1 DE 30 41 72 00 00 BO 00 0000:0000 00 00 00 E1 DA 32 00 70 1A 00 00 E1 00 30 00 E1 Based on the memory map above, AIR is at address ... if 8088 receives an INT 40 request