Epson PC AX Technical Manual page 244

DIAGRAHS AND REFERENCE MATERIALS
7. Katb Coprocessor Check (80287)
This module checks the mathematic coprocessor (80287).
When this module is called, the following message is displayed:
REV.A
+-----------------------------------------------------------------+
I I
I I
: 80287 COPROCESSOR TEST :
I I
I I
+-----------------------------------------------------------------+
1) Coprocessor Installation Check
a. CMOS RAM Setting Check
First, Equipment Determination of int Ilh is called to check
whether or not the coprocessor is installed.
If the the coprocessor not installed, the program displays
following error message:
+-----------------------------------------------------------------+
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: Error code
=
701 :
: COPROCESSOR NOT INSTALLED :
I I
I I
+-----------------------------------------------------------------+
b. Check by Initialization
The Initialize instruction (finit) is output to the
coprocessor, then the status word of the coprocessor is read
(fstsw) to check the installation status.
If all error bits are not read as "0", the program displays
following error message:
+-----------------------------------------------------------------+
I I
I I
: Error code
=
701 :
: COPROCESSOR NOT INSTALLED :
I I
I I
+-----------------------------------------------------------------+
2) Initialization Check of Coprocessor
The Initialize instruction (finit) is output to the
coprocessor, then the status word of the coprocessor is read (fstsw)
to check the initialization status.
If the all error bits are not read as "0" with BUSY
=
"0" and
ST
=
"0", the program displays fo11owing error message:
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