User`s guide

3.9 ISA Devices
Figure 3–13 shows the AlphaPC64 ISA bus implementation with peripheral
devices and connectors. Also shown is the utility bus with system support
devices.
Figure 3–13 ISA Devices
LJ04141B.AI
PCI-to-ISA
Bridge
82378ZB
PCI Bus
ISA
Slot
0
Combination
Chip
87312
AlphaPC64.30
AlphaPC64.29
AlphaPC64.30
AlphaPC64.30
Transceiver
ISA
Slot
1
ISA
Slot
2
TOY
1287
Keyboard
Mouse
8242
sa<18:0>sa<9:0>
sa<19:0>
sa<2>
sd<7:0>
la<23:17>
sd<15:0>
ubus<7:0>
AlphaPC64.32
Diskette J24
Parallel J25
COM1 J32
COM2 J30
IDE J26
flash_adr19
J17 J18 J19
Flash ROM
1M x 8
AlphaPC64.26
AlphaPC64.33
AlphaPC64.27
AlphaPC64.35 AlphaPC64.31AlphaPC64.35
86.5%
3.9.1 Keyboard and Mouse Controller
The Intel N8242 located on the ISA utility bus provides the keyboard and
mouse controller functions. It is packaged in a 44-pin plastic leadless chip
carrier (PLCC) configuration.
Functional Description 3–35