AT&T PC 6300 - 8087-2 Math Co-Processor

MAINTENANCE
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8087-2 Math Co-Processor
Possible defective hardware:
• 8087-2 Math Co-Processor
• Motherboard.
To test the 8087-2 Math Co-Processor, proceed as follows:
1. Turn the power switch OFF.
1*^ 2. Insert the MS-DOS System Diskette into drive A.
■ 3. Verify when the PC boots during the Resident Diagnostics
I I that the screen displays NPU 18087 PASS ROM BIOS 1.43 or
' ' greater.
! [ 4. Turn the power switch ON and verify that the Operating
' ' System is booted.
5. Remove the MS-DOS System Diskette from drive A.
6. Insert the System Test Diskette into drive A.
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