Specifications

4–8 Functional Description 9 March 1999 – Subject To Change
ISA Bus Devices
• Keyboard/mouse–An 8042-compatible interface is brought out to separate
6-pin DIN connectors (J5).
• Time-of-year clock–A DS1287-compatible clock is backed up by a replaceable
battery.
An onboard clock generator chip supplies a 14.3-MHz reference clock for the dis-
kette data separator and serial ports.
Figure 4–4 AlphaPC 164LX ISA Bus Devices
J5
J4
J13
PCI Bus
la<23:17>
sd<15:0>
PCI-to-ISA
Bridge
82378ZB
sd<7:0>
Parallel
COM1/2
Combination
Controller
37C935
Transceivers
J31
J30
Flash
ROM
1M X 8b
sa<19:0>
sa<15:0>
ubus_data<7:0>
pc164lx.22
pc164lx.25
pc164lx.28
pc164lx.4
ISA0
ISA1
FM-05948.AI4
sa<18:0>
pc164lx.23 pc164lx.23
J15
K/M
Config.
Jumpers
pc164lx.4
Ubus
Decoder
pc164lx.17
sa<2:0>
ecasaddr<2>
ior,iow
ubus_data<0>
adr19
Diskette