Issue # 25 DTACK GROUNDED Newsletter - November 1983
@eZine
Published in
DTACK GROUNDED Newsletter
· 1 year ago
... the rumor is correct.) HERE ARE THE FACTS: The following information was gathered from the Intel iAPX 86/88, 186/188 User's Manual, Intel #210912-001, pages 4-10 and 5-5; and from the IBM PC XT Technical Reference Manual, page 2-4. Page 4-10, shows that the 8088 has 5 (five) dedicated interrupt pointers (#0 - #4), 27 reserved interrupt pointers (#5 - #31), and 224 (user) available interrupt pointers (#32 - #255). Page 2-4 of the IBM manual reveals that MS-DOS uses 25 of those 27 reserved interrupt vectors. Specifically, MS-DOS uses #5 and #8 thru #31 inclusive. Now turn to page 5-6 of the Intel manual. Table 5-2 reveals that the 80186 ...
