IBM 512KB Memory Expansion Option Manual page 7

110 C hannel Check
When the I/O channel check occurs, a non-maskable interrupt
(NMI) results. Bits 6 and 7 of hex address 0061 are the status
bits used to determine the source of the NMI (bit 6 is I/O
~
channel check, and bit 7 is system board parity check). Writing
to the failing card will clear the status bit.
Specifications
Voltage Tolerances
The maximum variation of the +5 Vdc is +5% at the adapter
pins.
~
Power Dissipation
The + 5 V dc power used by the adapter is a maximum of 5.25
watts, and the maximum current used is 1 ampere.
Temperature Variation
The adapter will operate between 10 and 50 degrees Celsius (50
and-122 degrees Fahrenheit).
August 31,
1984
Personal Computer AT 512KB Memory Expansion Option 3