User`s guide

Table 5–2 Major Board Component Descriptions
Number Device Component Description
1 U36 Alpha 21064A–275 microprocessor—431 PGA,
DC290A, 275 MHz
2 U24 DECchip 21071–BA0, 208-pin PQFP, ASIC
3 U8 DECchip 21071–BA1, 208-pin PQFP, ASIC
4 U13 DECchip 21071–BA2, 208-pin PQFP, ASIC
5 U2 DECchip 21071–BA3, 208-pin PQFP, ASIC
6 U35 DECchip 21071–DA, 208-pin PQFP, ASIC
7 U31 DECchip 21071–CA, 208-pin PQFP, ASIC
8, 9 U25, 17 PALCE16V8–5, 5-ns, 125-mA, 20-pin PLCC
10, 11, 12 U14, U9, U5 74FCT162244ETPV—48 SSOP
13, 14, 15,
16, 17
U4, U7, U11,
U12, U16
74ABT162244 – 48-pin SSOP, 16-bit buffer/driver
18 U1 64K 1 CMOS OTP serial ROM (initialization
code)
19, 20 U3, U6 74F244 buffer/line driver
21 U10 Dallas DS1287—24-pin DIP, real-time clock and
50-byte RAM with crystal
22 U15 Intel N8242PC/PHOENIX/1991 mouse and
keyboard controller, 44-pin PLCC
23 U19 E28F008SA–120, 40-pin TSOP, 1MX8 CMOS flash
ROM, 120 ns
24 U28 74F245 transceiver
25 U18 LS05 inverter gate
26 U20 74F14 trigger, SOIC
27 U26 74F02D NOR gate
28 U32 74F257 data selector/mux
29 U27 PLD, MACH210–20, 20-ns, 180-mA, 44-pin PLCC,
interrupt controller
30 U33 14.3-MHz crystal oscillator, PCI-to-ISA bridge
(SIO) oscillator
31 U21 74F04 hex inverter
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5–4 Board Requirements and Parameters