Specifications

RN: 4-3
RS3: Software Release Notes for P1 R4.2
P1 R4.x Changes to RS3 manuals
PWA Number
The leftmost of these 2 EPROMS is U80, the rightmost U81
Figure 4.1. 68020 IO Processor Board
3. Verify that the r evision level of the board is new enough to
upgrade the EPROMs. The r evision of the board must be
revision B/C or newer.
NOTE: In order to classify as a newer revision board, both the letter
before and after the ’/‘ must be greater than the letters specified. For
example if the revision must be newer than X/Z, then the letter before
the ’/‘ must be greater than X and the letter after the ’/‘ m ust be greater
than Z. Double letters such as AA qualify as greater than Z . If the board
being upgraded does not meet the required revision level, then the
board must be upgraded by F isher-Rosemount Systems, Inc.
4. Using a small flat blade screwdriver, gently pry both of the old
EPROMs (see figure 1) out of the sockets. Work the ends of the
chip back and forth as the chip is being lifted from the sockets.
Remove both components and set aside.
5. Prepare the new components for installation. One of the EPROM
chips is labeled with a “ 1” and the other with a “0”. The chip
labeled with the “ 1” will go into location U80, and the chip labeled
“0” will go into location U81.(See Figure 4.1)
6. The pins of the new EPROMs may not be formed to fit directly
into the sockets. To form the pins, hold the chip by its ends.
Press the chip up against a hard flat surface with the pins
running adjacent to the surface. F irmly rotate the chip to bend the
pins slightly toward the other set of pins. (See F igure 4.2).