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4–8 Functional Description
ISA Bus Devices
Figure 4–4 AlphaPC 164SX ISA Bus Devices
4.3.2 ISA Expansion Slots
Two ISA expansion slots are provided for plug-in ISA peripherals (J22 and J23).
4.3.3 ISA I/O Address Map
Table 4–1 lists the AlphaPC 164SX ISA I/O space address mapping.
Table 4–1 ISA I/O Address Map
(Sheet 1 of 2)
Range (hex) Usage
000-00F 8237 DMA #1
020-021 8259 PIC #1
040-043 8253 timer
060-061 Ubus IRQ12 and NMI control
sd[7:0]
PCI-to-ISA
Bridge
CY82C693U-NC
la[23:17]
PCI
sd[15:0]
Combination
Controller
37C669
Diskette
Parallel
COM1/2
ISA0
ISA1
sa[19:0]
sa[15:0]
Transceivers
EIDE – Primary
EIDE – Secondary