Interrupt List - Release 61 (16jul00)
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HTML Edition
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Memory Map
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Reserved (and Not Otherwise Classified)
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RBIL61 - Reserved (and Not Otherwise Classified)
MEM 0000h:0500h - DATA AREA
MEM 0040h:0067h -
PC
IBM PC
only - CASSETTE TIME COUNT
MEM 0040h:0069h - CASSETTE
(
PC
IBM PC
only)
- CASSETTE CRC REGISTER
MEM 0040h:006Bh - CASSETTE
(
PC
IBM PC
only)
- LAST VALUE READ FROM CASSETTE
MEM 0040h:006Ch - TIMER TICKS SINCE MIDNIGHT
MEM 0040h:0070h - TIMER OVERFLOW
MEM 0040h:0072h -
POST
see Power-On Self-Test
RESET FLAG
MEM 0040h:008Bh -
PC
IBM PC
, PCjr,
PC
IBM PC
/
XT
IBM PC XT
11/8/82, Convertible - RESERVED
MEM 0040h:00ACh - RESERVED
MEM 0040h:00B4h - RESERVED
MEM 0040h:00B6h - RESERVED FOR
POST
see Power-On Self-Test
???
MEM 0040h:00B9h - ???
MEM 0040h:00C0h - RESERVED
MEM 0040h:00D0h - RESERVED
MEM 0040h:00F0h - INTRA-APPLICATION COMMUNICATION AREA
MEM 80C0h:0000h - COMPAQ DIAGNOSTICS REGISTER
MEM F000h:C000h - Tandy
ROM
(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs.
BIOS
(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly.
ID BYTE
MEM F000h:FFE8h - Compaq - MACHINE SIGNATURE STRING
MEM FFFFh:0010h - HIGH MEMORY AREA
(
HMA
see High Memory Area
)
MEM xxxxh:xxx0h - BIOS32 Service Directory
MEM xxxxh:xxx0h - Desktop Management Interface / System Management
BIOS
(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly.
MEM xxxxh:xxx0h - Multiprocessor Specification - FLOATING POINTER STRUCTURE