Memory Address Map; Pci To Isa Bus Interrupt Mapping - Intergraph TD-x20 System Reference Manual

Address
03E8 - 03EF
03F0 - 03F7
03F8 - 03FF

Memory Address Map

The following table lists the memory address map assignments.
Memory Address
00000000 - 0009FFFF
000A0000 - 000BFFFF
000C0000 - 000C7FFF
000C8000 - 000DFFFF
000E0000 - 000EFFFF
000F0000 - 000FFFFF
00100000 - 1FFFFFFF
20000000 - 3FFFFFFF

PCI to ISA Bus Interrupt Mapping

The ISA bridge (Intel 82371SB) provides the sixteen conventional ISA interrupts, plus four
interrupt request pins for PCI peripheral interrupts (PIRQ0 through PIRQ3). For PC-AT
architecture compatibility reasons, the PCI interrupts are routed to the ISA interrupts within
the ISA bridge. The assertion of a PCI interrupt concludes in an ISA interrupt being
asserted.
Bit 7 of each PIRQ registers enable (Low) or disable (High) the routing of the PIRQ to an
ISA interrupt. The lowest four bits (3:0) of each PIRQ register determines to which ISA
interrupt the PIRQ will be routed. The PIRQs can be mapped to the following ISA
interrupts:
IRQ 5, 9, 10, 11, 15
Device
Serial Port COM3
I/O Controller
Serial Port COM1
Size Assignment
640K System board memory
128K Video memory
32K Video ROM
96K Available I/O Adapter ROM
64K BIOS ROM and PCMCIA
64K BIOS ROM
511M Expansion memory
----- Reserved
51