Original PC Hardware Reference
Original PC Hardware Reference
Original PC Hardware Reference
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CD: 26 <strong>Original</strong> <strong>PC</strong> <strong>Hardware</strong> <strong>Reference</strong><br />
(continued)<br />
Physical Specifications<br />
Footprint type<br />
Dimensions:<br />
Desktop<br />
Height 5.5 inches<br />
Width 19.5 inches<br />
Depth 16.0 inches<br />
Weight 32 pounds<br />
Environmental Specifications<br />
Power-supply output 130 watts<br />
Worldwide (110v/60Hz, 220v/50Hz) No<br />
Auto-sensing/switching<br />
Maximum current:<br />
No<br />
90–137 VAC<br />
Operating range:<br />
4.2 amps<br />
Temperature 60–90 degrees F<br />
Relative humidity 8–80 percent<br />
Maximum operating altitude 7,000 feet<br />
Heat (BTUs/hour) 717<br />
Noise (Average db, operating, 1m) 56<br />
FCC classification Class B<br />
Table 6 shows the XT motherboard switch settings. The XT motherboard uses a single eight-position<br />
switch block to control various functions, as detailed in the table.<br />
Table 6 IBM <strong>PC</strong>/XT Motherboard Switch Settings<br />
Switch Block 1 (<strong>PC</strong> and XT)<br />
Switch 1 IBM <strong>PC</strong> Function (<strong>PC</strong> Only)<br />
Off Boot from Floppy Drives<br />
On Do Not Boot from Floppy Drives<br />
Switch 1 IBM XT Function (XT Only)<br />
Off Normal POST (power on self test)<br />
On Continuous Looping POST<br />
Switch 2 Math Coprocessor (<strong>PC</strong>/XT)<br />
Off Installed<br />
On Not Installed<br />
Switch 3 Switch 4 Installed Motherboard Memory (<strong>PC</strong>/XT)<br />
On On Bank 0 Only<br />
Off On Banks 0 and 1<br />
On Off Banks 0, 1, and 2<br />
Off Off All 4 Banks
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