Math Coprocessor Installation
K.1 -
Math Coprocessor Installation
The math coprocessor can be added to 80C186 CPU (PiC900 or PiC90) or
80C186EC (PiC9XX) modules to support additional arithmetic, logarithmic, exponential, trigonometric, and floating point mathematical operations.
You will be installing the math coprocessor in one of three ways depending on
which of the following you have:
1.
A PiC900 CPU module
2.
A PiC9XX CPU module
3.
A PiC90 CSM/CPU module
The procedure covers installing the coprocessor directly on the PiC900 CPU,
PiC9XX CPU, or the PiC90 CSM/CPU module.
IMPORTANT
With a PiC900, the math coprocessor works on the version of the
CPU module which has a factory installed oscillator on it. (See Figure K-1 for its location.) Some earlier versions do not have this oscillator.
If your CPU does not have an oscillator installed, return it to the factory for an upgrade before installing the math coprocessor.
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K.1 -1
Math Coprocessor Installation
1. Procedure for installing the math coprocessor on the CPU or CSM/CPU module
1.
Follow standard precautions before handling any electronics components.
Lay the module on a static-free surface, label side up. Ground yourself using a
properly grounded wrist strap before you open the module.
2.
Press the plastic tabs at the top and bottom of the module toward each other
and lift off the module cover.
3.
The math coprocessor should be positioned in the module according to the
illustration in Figure K-1 for a PiC900, in Figure K-2 for a PiC9XX, or in Figure K-3 for a PiC90.
The math coprocessor is shipped in a socket for easy installation. The math
coprocessor, the socket, and the module socket are each notched. All notches
should be on the same end.
NOTE: With the PiC900, the math coprocessor has 40 pins and the module
socket has 48 pinholes. Line pins up beginning on the notched end of the module socket and press in place. When the math coprocessor is inserted, there
should be eight empty pinholes on the unnotched end of the module socket as
shown in the enlarged area of Figure K-1.
K.1 -2
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Math Coprocessor Installation
Figure K-1. Installing the Math Coprocessor on the PiC900 CPU
CPU module (cover removed)
EXP DATA HI
DATA LO
EXP DATA LO
LAD MEM LO
LAD MEM HI
EXEC MEM LO
EXEC MEM HI
EPROM
RAM
64K
256K
DATA HI
48 Pin Socket for Math Coprocesseor
(or socket for daughter board connector)
Factory installed Oscillator
LAD MEM SEL
40 Pin Math Coprocessor
Match notches and
line pins up, starting
at notched edge.
PiC900
CO-PROCESSOR
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Enlarged view of math coprocessor
inserted into CPU socket
PiC900
CO-PROCESSOR
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Eight empty pinholes
on unnotched end of
CPU socket
AA898-3891
IMPORTANT
Check the following:
• The math coprocessor is oriented correctly with all notches on the
same end.
• The pins are inserted from the notched end leaving eight empty pinholes on the unnotched end on the PiC900 CPU.
If the math coprocessor is installed backwards or in the wrong pinholes, it may be damaged or destroyed when power is turned on to the
system.
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Math Coprocessor Installation
Figure K-2. Installing the Math Coprocessor on the PiC9XX CPU
Socket for
Math
Coprocessor
APPLICATION MEMORY LOW
DIAG LED
Configure LED
SYSTEM RAM HI
SYSTEM RAM LOW
PiC900
CO-PROCESSOR
401-54187-10
Math
Coprocessor
APPLICATION MEMORY HI
Match
notches
Communication LEDs
RAM
DISK
RM
EP
RAM DISK LOW
RAM
EPROM
APPLICATION
MEMORY
RAM DISK HI
Communication Port
PiCPro Port
User Port
Fiber Optic
Connections
K.1 -4
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Math Coprocessor Installation
Figure K-3. Installing the Math Coprocessor on the PiC90 CSM/CPU
DIAG LED
PWR LED
SCAN LED
BATT LED
Power Supply
Match
notches
PiC900
CO-PROCESSOR
401-54187-10
Ladder
memory
BATTERY
Key
Battery
+
Math coprocessor
socket
4.
Replace the module cover. Insert the module in the rack. Turn the key switch
to Stop. Turn on power. Using PiCPro, download application module (see
PiC900 Software Manual) and turn key switch to Run.
CAUTION
Follow the power on sequence as defined above. If not followed, the
PiC900 may malfunction.
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K.1 -5
Math Coprocessor Installation
NOTES
K.1 -6
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