8259
The 8259 interrupt controller decided which device got the processor's attention.
- Odd
- Composite
Where 8259 fits
Why 8259 is special
With only eight inputs, two had to be cascaded to reach fifteen usable interrupts, and running out of them was the defining frustration of installing expansion cards before plug-and-play.
Factors & digit properties
- Divisors (4)
- 1, 3, 2753, 8259
- Prime factorisation
- 3 × 2753
- Digit sum
- 24
- Digital root
- 6
Representations
- Decimal
- 8259
- Binary
- 10000001000011
- Octal
- 20103
- Hexadecimal
- 2043
- Scientific notation
- 8.259 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
The 8253 timer and 8259 interrupt controller are two of the support chips that defined the original IBM PC architecture, and both left constraints that outlived the hardware.
View 8253 →Other connections
- is associated with8253
why?
Strength 0.50, confidence "high".
Technology & computing
RFC 8259 is the current specification of the JSON data interchange format, resolving earlier ambiguities about duplicate keys, top-level values and character encoding across several previous documents.
DocumentedTechnology & computingGeography: International — IETFPeriod: 2017The 8259 offered fifteen interrupt lines across two cascaded chips, and every card needed one. Interrupt conflicts were the standard failure of PC expansion for over a decade.
DocumentedTechnology & computing
Common questions
Is 8259 a prime number?
No, 8259 is not prime.
What are the factors of 8259?
The factors of 8259 are 1, 3, 2753, 8259.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 3 August 2026