Original PC Hardware Reference
Original PC Hardware Reference
Original PC Hardware Reference
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Memory<br />
An Introduction to the AT CD: 45<br />
Standard on system board 512KB<br />
Maximum on system board 512KB<br />
Maximum total memory 16MB<br />
Memory speed (ns) and type 150ns Dynamic RAM chips<br />
System board memory-socket type 16-pin DIP<br />
Number of memory-module sockets 18 or 36 (2 or 4 banks of 18)<br />
Memory used on system board 36 128KB ×1-bit DRAM chips in 2 banks of 18, or 18 256KB<br />
×1-bit chips in one bank<br />
Memory cache controller<br />
Wait states:<br />
No<br />
System board 1<br />
Adapter 1<br />
Standard Features<br />
ROM size 64KB<br />
ROM shadowing No<br />
Optional math coprocessor 80287<br />
Coprocessor speed 4 or 5.33MHz<br />
Standard graphics None standard<br />
RS232C serial ports 1 (some models)<br />
UART chip used NS16450<br />
Maximum speed (bits per second) 9,600bps<br />
Maximum number of ports supported 2<br />
Pointing device (mouse) ports None standard<br />
Parallel printer ports 1 (some models)<br />
Bidirectional Yes<br />
Maximum number of ports supported 3<br />
CMOS real-time clock (RTC) Yes<br />
CMOS RAM 64 bytes<br />
Battery life 5 years<br />
Disk Storage<br />
Internal disk and tape drive bays 1 full-height and 2 half-height<br />
Number of 3 1/2-inch and 5 1/4-inch bays 0/3<br />
Standard floppy drives<br />
Optional floppy drives:<br />
1×1.2MB<br />
5 1/4-inch 360KB Optional<br />
5 1/4-inch 1.2MB Standard<br />
3 1/2-inch 720KB Optional<br />
3 1/2-inch 1.44MB Optional (8MHz models)<br />
3 1/2-inch 2.88MB No<br />
(continues)
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