MMS3120022-000 original equipment spare parts

MMS3120022-000 original equipment spare parts

Technical data of product parameters

In addition to an I/O port address, an I/O device has a separate hardware interrupt MMS3120022-000
line assignment. Assigned to each interrupt line is a corresponding interrupt vector in
the 256-vector interrupt table at $00000 to $003FF in memory. The 16 maskable
interrupts and the single Non-Maskable Interrupt (NMI) are listed in Table 2-3 along
with their functions. Table 2-4 on page 43 details the vectors in the interrupt vector MMS3120022-000
table. The interrupt number in HEX and decimal are also defined for real and
protected mode in Table 2-4 on page 43.
The interrupt hardware implementation on the VMIVME-7750 is standard for
computers built around the PC architecture, which evolved from the IBM PC/XT. In MMS3120022-000
the IBM PC/XT computers, only eight interrupt request lines exist, numbered from
IRQ0 to IRQ7 at the PIC. The IBM PC/AT computer added eight more IRQx lines,
numbered IRQ8 to IRQ15, by cascading a second slave PIC into the original master
PIC. IRQ2 at the master PIC was committed as the cascade input from the slave PIC.
This architecture is represented in Figure 2-1 on page 47.
To maintain backward compatibility with PC/XT systems, IBM chose to use the new
IRQ9 input on the slave PIC to operate as the old IRQ2 interrupt line on the PC/XT
Expansion Bus. Thus, in AT systems, the IRQ9 interrupt line connects to the old IRQ2
pin (pin B4) on the AT Expansion Bus (or ISA bus).

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