482:
bit) on the Data line serially as it toggles the Clock line once for each bit. The host controls the direction of communication using the Clock line; when the host pulls it low, communication from the attached device is inhibited. The host can interrupt the device by pulling Clock low while the device is transmitting; the device can detect this by Clock staying low when the device releases it to go high as the device-generated clock signal toggles. When the host pulls Clock low, the device must immediately stop transmitting and release Clock and Data to both float high. (So far, all of this is the same as the unidirectional communication protocol of the IBM PC keyboard port, though the serial frame formats differ.) The host can use this state of the interface simply to inhibit the device from transmitting when the host is not ready to receive. (For the IBM PC keyboard port, this was the only normal use of signalling from the computer to the keyboard. The keyboard could not be commanded to retransmit a keyboard scan code after it had been sent, since there was no reverse data channel to carry commands to the keyboard, so the only way to avoid losing scan codes when the computer was too busy to receive them was to inhibit the keyboard from sending them until the computer was ready. This mode of operation is still an option on the IBM AT and PS/2 keyboard port.)
559:, and keyboards designed for one can be connected to the other with a simple wiring adapter. Such wiring adapters and adapter cables were once commonly available for sale. Note that IBM PC and PC XT keyboards use a different unidirectional protocol with the same DIN connector as AT keyboards, so though a PC or XT keyboard can be connected to PS/2 port using a wiring adapter intended for an AT keyboard, the earlier keyboard will not work with the PS/2 port. (At least, it cannot work with normal PS/2 keyboard driver software, including the system BIOS keyboard driver.)
486:
to transmit in the other direction. However, while device-to-host transmission reads bits on falling Clock edges, transmission in the other direction reads bits on rising edges. After the data byte, the host releases the Data line, and the device will pull the Data line low for one clock period to indicate successful reception. A keyboard normally interprets the received byte as a command or a parameter for a preceding command. The device will not attempt to transmit to the host until both Clock and Data have been high for a minimum period of time.
714:
973:
290:
51:
504:
810:
513:
912:
960:. Hot swapping PS/2 devices usually does not cause damage because more modern microcontrollers tend to have more robust I/O lines built into them which are harder to damage than those of older controllers; however, hot swapping can still potentially cause damage on older machines, or machines with less robust port implementations.
1001:
on the motherboard. This makes design and manufacturing extremely simple and cheap. However, a rare side effect of this design is that a malfunctioning device can cause the controller to become confused, resulting in both devices acting erratically. (A well designed and programmed controller will not
485:
To send a byte of data back to the device, the host pulls Clock low, waits briefly, pulls Data low and releases the Clock line again. The device then generates a Clock signal while the host outputs a frame of bits on the Data line, one bit per Clock pulse, similar to what the attached device would do
980:
PS/2 connectors are not designed to be plugged in and out very often, which can lead to bent or broken pins. Additionally, PS/2 connectors only insert in one direction and must be rotated correctly before attempting connection. (If a user attempts to insert the connector in the wrong orientation and
963:
If they are hot swapped, the devices must be similar enough that the driver running on the host system recognizes and can be used with the new device. Otherwise, the new device will not function properly. While this is seldom an issue with standard keyboard devices, the host system rarely recognizes
489:
Transmission from the device to the host is favored because from the normal idle state, the device does not have to seize the channel before it can transmit—the device just begins transmitting immediately. In contrast, the host must seize the channel by pulling first the Clock line and then the Data
481:
The interface has two main signal lines, Data and Clock. These are single-ended signals driven by open-collector drivers at each end. Normally, the transmission is from the device to the host. To transmit a byte, the device simply outputs a serial frame of data (including 8 bits of data and a parity
458:
connector used by Apple, a given system's keyboard and mouse port may not be interchangeable since the two devices use different sets of commands and the device drivers generally are hard-coded to communicate with each device at the address of the port that is conventionally assigned to that device.
694:
wiring adapter to allow connection to a PS/2 port. Such passive adapters are not standardized and may therefore be specific to the device they came with. Connecting them to a PS/2 port would require a protocol converter, actively translating between the protocols. Such adapters only support certain
665:
Also, USB mice do not cause the USB controller to interrupt the system when they have no status change to report according to the USB HID specification's default profile for mice. Both PS/2 and USB allow the sample rate to be overridden, with PS/2 supporting a sampling rate of up to 200 Hz and
453:
design. The PS/2 keyboard port is electrically and logically identical to the IBM AT keyboard port, differing only in the type of electrical connector used. The PS/2 platform introduced a second port with the same design as the keyboard port for use to connect a mouse; thus the PS/2-style keyboard
988:
computers and care should be taken to avoid damaged or bent pins when connecting devices. This issue is slightly alleviated in modern times with the advent of the PS/2-to-USB adapter: users can just leave a PS/2 connector plugged into the PS/2-to-USB adapter at all times and not risk damaging the
661:
USB mice send data more quickly than PS/2 mice because standard USB mice are polled at a default rate of 125 Hz while standard PS/2 mice send interrupts at a default rate of 100 Hz when they have data to send to the computer. However, PS/2 mice and keyboards are favored by many gamers
678:
requires that it explicitly handle key rollover, with the full HID keyboard class supporting n-key rollover. However, the USB boot keyboard class (designed to allow the BIOS to easily provide a keyboard in the absence of OS USB HID support) only allows 6-key rollover. Some keyboard peripherals
477:
channel. The channel is slightly asymmetrical: it favors transmission from the input device to the computer, which is the majority case. The bidirectional IBM AT and PS/2 keyboard interface is a development of the unidirectional IBM PC keyboard interface, using the same signal lines but adding
540:
and some contemporary motherboards have a single port that supports either a keyboard or a mouse. Sometimes the port also allows one of the devices to be connected to the two normally unused pins in the connector to allow both to be connected at once through a special splitter cable. This
698:
Older PS/2-only peripherals can be connected to a USB port via an active converter, which generally provides a pair of PS/2 ports (which may be designated as one keyboard and one mouse, even though both ports may support both protocols) at the cost of one USB port on the host computer.
566:(which was generally used for mice on PCs without PS/2 ports), but nonetheless many mice were made that could operate on both with a simple passive wiring adapter, where the mice would detect the presence of the adapter based on its wiring and then switch protocols accordingly.
795:
used the color orange for the keyboard connector for a short period, but soon switched to purple.) Today this code is still used on most PCs. The pinouts of the connectors are the same, but most computers will not recognize devices connected to the wrong port.
687:
Many keyboards and mice were specifically designed to support both the USB and the PS/2 interfaces and protocols, selecting the appropriate connection type at power-on. Such devices are generally equipped with a USB connector and ship with a
626:
However, as of 2023, although PS/2 ports are rarely included in off the shelf computer systems, they continue to be included on some computer motherboards and are favored by some users for various reasons including the following:
955:
PS/2 ports are designed to connect the digital I/O lines of the microcontroller in the external device directly to the digital lines of the microcontroller on the motherboard. They are not designed to be
631:
PS/2 ports may be favored for security reasons in a corporate environment as they allow USB ports to be totally disabled, preventing the connection of any USB removable disks and malicious USB devices.
791:
standard introduced a color code: the keyboard port, and the plugs on compliant keyboards, were purple; mouse ports and plugs were green. (Some vendors initially used a different color code;
984:
Most but not all connectors include an arrow or flat section which is usually aligned to the right or top of the jack before being plugged in. The exact direction may vary on older or non-
924:
1196:
662:
because they essentially have zero latency through the port. There is no "polling" needed by the OS. The device notifies the OS when it's time to receive a packet of data from it.
1002:
behave in this way.) The resulting problems can be difficult to troubleshoot (e.g., a bad mouse can cause problems that appear to be the fault of the keyboard and vice versa).
1438:
1964:
2010:
1062:
There is actually no technical reason that either port could not work with either type of device, if appropriate software was written to support that arrangement.
1092:
Compare the logic diagrams in the IBM Personal
Computer Technical Reference manual with those in the IBM Personal Computer AT Technical Reference manual.
522:
1995:
1431:
490:
line low and waiting for the device to have time to release the channel and prepare to receive; only then can the host begin to transmit data.
1296:
1225:
592:, etc.) computers. Macintosh clone computers based on the "LPX-40" logic board design featured PS/2 mouse and keyboard ports, including the
2015:
1969:
1424:
577:
1253:
1277:
893:
675:
639:
134:
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and mouse interfaces are electrically similar and employ the same communication protocol. However, unlike the otherwise similar
679:
support only the latter class, and some OSes may fail to switch to using the full HID keyboard class with a device after boot.
652:
on certain motherboards due to driver issues or lack of support. The PS/2 interface has near-universal compatibility with BIOS.
1373:
831:
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1959:
1316:
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the new device attached to the PS/2 mouse port. In practice most keyboards can be hot swapped but this should be avoided.
874:
1990:
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846:
1075:
2000:
1624:
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468:
459:(That is, keyboard drivers are written to use the first port, and mouse drivers are written to use the second port.)
1362:
1803:
853:
827:
569:
PS/2 mouse and keyboard connectors have also been used in non-IBM PC-compatible computer systems, such as the DEC
2005:
1617:
30:"PS/2 keyboard" and "PS/2 mouse" redirect here. For the keyboards normally supplied with IBM PS/2 computers, see
381:
Keyboard and mouse ports may be combined into a single port which can be used to connect both by splitter cable.
1934:
1847:
1820:
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1554:
981:
then tries to rotate it to the correct orientation without first pulling it out, then bent pins could result.)
860:
787:
Original PS/2 connectors were black or had the same color as the connecting cable (mainly white). Later, the
666:
USB supporting a polling rate up to 1 kHz as long as the mouse runs at full-speed USB speeds or higher.
1877:
1872:
1760:
1733:
820:
690:
1197:"Massive, undetectable security flaw found in USB: It's time to get your PS/2 keyboard out of the cupboard"
708:
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842:
431:
246:
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ports now normally preferred for connecting keyboards and mice. This dates back at least as far as the
713:
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415:
972:
50:
1777:
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1239:
751:
613:
455:
438:, with which it was introduced in 1987. The PS/2 mouse connector generally replaced the older
435:
419:
64:
478:
capability to send data back to the keyboard from the computer; this explains the asymmetry.
1612:
1503:
593:
521:
289:
31:
1120:
555:
The PS/2 keyboard interface is electrically the same as the 5-pin DIN connector on earlier
445:"serial mouse" connector, while the PS/2 keyboard connector replaced the larger 5-pin/180°
1772:
1750:
1713:
1661:
1481:
1476:
1468:
1260:
1020:
1016:
755:
695:
classes of USB devices such as keyboards and mice, but are not model- or vendor-specific.
556:
471:
867:
929:
Please expand the section to include this information. Further details may exist on the
834: in this section: Hardware issues. Unsourced material may be challenged and removed.
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1738:
1508:
1491:
1173:
1101:
IBM Personal
Computer Technical Reference, IBM Personal Computer AT Technical Reference
1039:
1034:
1030:
930:
439:
423:
200:
116:
68:
27:
6-pin mini-DIN connector for connecting keyboards and mice to a PC compatible computer
1984:
1939:
1909:
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1604:
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1401:
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35:
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147:
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1745:
1708:
1676:
1518:
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809:
605:
585:
55:
The color-coded PS/2 connection ports (purple for keyboard and green for mouse)
1929:
1646:
1576:
1571:
1561:
589:
562:
In contrast to this, the PS/2 mouse interface is substantially different from
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17:
1919:
1903:
1832:
1671:
1523:
1486:
1416:
1025:
998:
617:
450:
911:
245:
Serial data at 10.0–16.7 kHz with 1 start bit, 8 data bits (
709:
PC System Design Guide § Color-coding scheme for connectors and ports
512:
1862:
1513:
1448:
997:
In a standard implementation both PS/2 ports are usually controlled by a
792:
581:
549:
184:
1352:
1696:
1634:
1588:
728:
620:
574:
258:
34:. For peripherals and game conversions for the video game console, see
1810:
1583:
772:
717:
563:
546:
537:
442:
120:
530:
PS/2 dualport, corresponding splitter (Y-cable) and pinout (female).
971:
788:
744:
712:
989:
pins this way. A USB-to-PS/2 adapter does not have this problem.
638:, although USB keyboards have no such restriction either, unless
1887:
1781:
649:
1420:
1867:
1691:
1240:"Computer Labs 2012/2013 - 1st Semester Lab 5: The PS/2 Mouse"
1044:
985:
905:
803:
609:
542:
130:
84:
1226:"Mouse Optimization Guide: Acceleration Fix and Polling Rate"
645:
To free USB ports for other uses like removable USB devices.
288:
1297:"The pros and cons of PS-2 to USB adapters and converters"
1070:
1068:
720:
keyboard with non-standard colored PS/2 connector (orange)
1397:
Technical information on
Interfacing with the AT keyboard
1354:
Hardware
Interface Technical Reference -Common Technical-
1364:
PS/2 keyboard and mouse mini-DIN 6 connector pinouts
1952:
1896:
1855:
1846:
1724:
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126:
108:
90:
80:
75:
60:
1295:
648:Some USB keyboards may not be able to operate the
249:first), 1 parity bit (odd), 1 stop bit,
634:The PS/2 interface provides no restriction on
1965:History of computing hardware (1960s–present)
1432:
1220:
1218:
8:
1110:IBM Personal Computer AT Technical Reference
43:
1852:
1464:
1439:
1425:
1417:
1346:"Keyboard and Auxiliary Device Controller"
723:
399:Sometimes, mouse Clock for splitter cable.
42:
894:Learn how and when to remove this message
430:computer system. Its name comes from the
390:Sometimes, mouse Data for splitter cable.
1121:"PS/2 Keyboard (IBM Thinkpad) Y adapter"
1055:
374:
2011:Computer-related introductions in 1987
1378:, Computer engineering, archived from
1254:"Device Class Definition for HID 1.11"
976:Bus powered PS/2 female-to-USB adapter
7:
1970:List of pioneers in computer science
832:adding citations to reliable sources
1315:Adam Chapweske (5 September 2003).
1195:Anthony, Sebastian (31 July 2014).
1142:Lenerz, Gerhard (7 November 2006).
923:about i8042 issues as described in
596:and the Power Computing PowerBase.
1317:"The PS/2 Mouse/Keyboard Protocol"
25:
1278:"N-key Rollover via PS/2 and USB"
910:
808:
520:
511:
502:
135:USB human interface device class
49:
819:needs additional citations for
683:Conversion between PS/2 and USB
299:Female connector from the front
1996:Deutsches Institut für Normung
1400:, Beyond logic, archived from
1078:. 1 April 2003. Archived from
817:This section: Hardware issues
1:
1960:History of computing hardware
642:mode, which is the exception.
552:notebooks among many others.
1828:Network interface controller
670:USB key rollover limitations
2016:Computer hardware standards
1625:Refreshable braille display
1567:Refreshable braille display
1280:. Geek hack. Archived from
1174:"Power Computing PowerBase"
541:configuration is common on
344:+5 V DC at 275 mA
96:; 37 years ago
2032:
1150:. SGIstuff. Archived from
1076:"The PS/2 Mouse Interface"
706:
676:USB HID keyboard interface
600:Legacy port status and USB
29:
1375:PS/2 In-depth information
759:
726:
604:PS/2 is now considered a
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93:
83:
63:
48:
210:Dedicated pin and shield
168:4 wires plus shield
1734:Central processing unit
623:specification of 2000.
467:Each port implements a
1144:"Common Input Devices"
999:single microcontroller
977:
921:is missing information
721:
463:Communication protocol
293:
142:General specifications
1082:on 16 September 2008.
975:
716:
432:IBM Personal System/2
292:
1357:. IBM. October 1990.
1284:on 25 December 2010.
828:improve this article
418:used for connecting
1991:Computer connectors
1382:on 1 September 2006
1323:on 16 November 2016
1012:BIOS interrupt call
45:
2001:Computer keyboards
1266:on 11 August 2014.
978:
722:
436:personal computers
416:mini-DIN connector
294:
127:Superseded by
76:Production history
1978:
1977:
1948:
1947:
1878:Analog audio jack
1599:
1598:
1404:on 30 August 2018
1203:. Ziff Davis, LLC
948:
947:
904:
903:
896:
878:
785:
784:
494:Port availability
456:Apple Desktop Bus
408:
407:
121:Mini-DIN-9 InPort
16:(Redirected from
2023:
2006:Pointing devices
1853:
1504:Optical trackpad
1469:Pointing devices
1465:
1441:
1434:
1427:
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1409:
1390:
1389:
1387:
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1358:
1350:
1333:
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1319:. Archived from
1312:
1306:
1305:
1299:
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1285:
1274:
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1265:
1259:. Archived from
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1021:IBM PC keyboards
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906:
899:
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888:
885:
879:
877:
836:
812:
804:
736:Connector on PC
724:
640:operated in BOOT
594:Motorola StarMax
573:line, early IBM
524:
515:
506:
400:
397:
391:
388:
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379:
224:
222:
104:
102:
97:
53:
46:
32:Model M keyboard
21:
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1714:USB flash drive
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1482:Game controller
1477:Graphics tablet
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1154:on 26 June 2007
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993:Fault isolation
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800:Hardware issues
756:pointing device
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657:Latency of mice
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150:
144:
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139:
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128:
124:
123:
117:DE-9 connector
110:
106:
105:
92:
88:
87:
82:
78:
77:
73:
72:
71:data connector
69:computer mouse
62:
58:
57:
54:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
2028:
2017:
2014:
2012:
2009:
2007:
2004:
2002:
1999:
1997:
1994:
1992:
1989:
1988:
1986:
1971:
1968:
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1961:
1958:
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1955:
1951:
1941:
1938:
1936:
1933:
1931:
1928:
1926:
1923:
1921:
1918:
1916:
1913:
1911:
1910:Parallel port
1908:
1905:
1902:
1901:
1899:
1895:
1889:
1886:
1884:
1881:
1879:
1876:
1874:
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1749:
1747:
1744:
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1737:
1736:
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1732:
1731:
1729:
1727:
1726:Computer case
1723:
1715:
1712:
1710:
1707:
1706:
1705:
1702:
1698:
1695:
1693:
1690:
1688:
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1684:
1683:
1680:
1678:
1675:
1673:
1670:
1669:
1667:
1665:
1659:
1653:
1652:Graphics card
1650:
1648:
1645:
1643:
1640:
1636:
1633:
1632:
1631:
1628:
1626:
1623:
1619:
1616:
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1610:
1608:
1606:
1602:
1590:
1587:
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1578:
1575:
1574:
1573:
1570:
1568:
1565:
1563:
1560:
1556:
1553:
1552:
1551:
1550:Graphics card
1548:
1546:
1545:Image scanner
1543:
1541:
1538:
1537:
1535:
1531:
1525:
1522:
1520:
1517:
1515:
1512:
1510:
1507:
1505:
1502:
1498:
1495:
1494:
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1488:
1485:
1483:
1480:
1478:
1475:
1474:
1472:
1470:
1466:
1463:
1461:
1460:Input devices
1457:
1453:
1450:
1442:
1437:
1435:
1430:
1428:
1423:
1422:
1419:
1403:
1399:
1398:
1393:
1381:
1377:
1376:
1371:
1366:
1365:
1360:
1356:
1355:
1347:
1343:
1342:
1338:
1322:
1318:
1311:
1308:
1303:
1298:
1291:
1288:
1283:
1279:
1273:
1270:
1262:
1255:
1249:
1246:
1241:
1235:
1232:
1227:
1221:
1219:
1215:
1202:
1198:
1191:
1188:
1176:. Low end Mac
1175:
1169:
1166:
1153:
1149:
1145:
1138:
1135:
1123:. RU: Pinouts
1122:
1116:
1113:
1107:
1104:
1098:
1095:
1089:
1086:
1081:
1077:
1071:
1069:
1065:
1059:
1056:
1050:
1046:
1043:
1041:
1038:
1036:
1032:
1029:
1027:
1024:
1022:
1018:
1017:DIN connector
1015:
1013:
1010:
1009:
1005:
1003:
1000:
992:
990:
987:
982:
974:
967:
965:
961:
959:
958:hot swappable
950:
942:
939:December 2020
932:
926:
922:
919:This section
917:
913:
908:
907:
898:
895:
887:
876:
873:
869:
866:
862:
859:
855:
852:
848:
845: –
844:
840:
839:Find sources:
833:
829:
823:
822:
815:
811:
806:
805:
799:
797:
794:
790:
781:
777:
774:
771:
768:
767:
763:
757:
753:
749:
746:
743:
740:
739:
735:
732:
730:
725:
719:
715:
710:
702:
700:
696:
693:
692:
682:
680:
677:
669:
667:
663:
656:
651:
647:
644:
641:
637:
633:
630:
629:
628:
624:
622:
619:
615:
611:
607:
599:
597:
595:
591:
588:, and newer (
587:
583:
580:machines and
579:
576:
572:
567:
565:
560:
558:
553:
551:
548:
544:
539:
523:
514:
505:
493:
491:
487:
483:
479:
476:
473:
470:
469:bidirectional
462:
460:
457:
452:
448:
447:DIN connector
444:
441:
437:
433:
429:
428:PC compatible
425:
421:
417:
413:
396:
393:
387:
384:
378:
375:
370:
367:Not connected
366:
364:
360:
357:
354:
351:
347:
343:
341:
338:
334:
330:
327:
323:
320:Not connected
319:
317:
313:
309:
306:
302:
297:
291:
286:
281:
278:
271:
263:
260:
252:
248:
240:
235:
227:
213:
205:
202:
194:
189:
186:
179:
171:
163:
155:
149:
148:Hot pluggable
145:
140:
136:
132:
125:
122:
118:
114:
113:DIN connector
107:
89:
86:
79:
74:
70:
66:
59:
52:
47:
41:
37:
36:PlayStation 2
33:
19:
18:PS/2 keyboard
1924:
1816:Power MOSFET
1799:Power supply
1768:Data storage
1704:Flash memory
1682:Optical disc
1664:data storage
1406:, retrieved
1402:the original
1396:
1386:11 September
1384:, retrieved
1380:the original
1374:
1367:, Burton sys
1363:
1353:
1325:. Retrieved
1321:the original
1310:
1301:
1290:
1282:the original
1272:
1261:the original
1248:
1234:
1205:. Retrieved
1200:
1190:
1178:. Retrieved
1168:
1156:. Retrieved
1152:the original
1147:
1137:
1125:. Retrieved
1115:
1106:
1097:
1088:
1080:the original
1058:
996:
983:
979:
962:
954:
936:
920:
890:
881:
871:
864:
857:
850:
838:
826:Please help
821:verification
818:
786:
697:
689:
686:
673:
664:
660:
636:key rollover
625:
603:
571:AlphaStation
568:
561:
557:AT keyboards
554:
535:
488:
484:
480:
466:
449:used in the
411:
409:
395:
386:
377:
265:Max. devices
229:Max. current
215:Max. voltage
40:
1915:Serial port
1906:(IEEE 1394)
1883:DisplayPort
1873:Thunderbolt
1746:Motherboard
1709:Memory card
1677:Floppy disk
1519:Touchscreen
1327:26 November
1201:ExtremeTech
1031:Connections
951:Hotplugging
843:"PS/2 port"
606:legacy port
472:synchronous
414:is a 6-pin
242:Data signal
232:275 mA
1985:Categories
1662:Removable
1647:Sound card
1577:Sound chip
1572:Sound card
1562:Microphone
1452:components
1302:TechTarget
1207:26 October
1051:References
968:Durability
884:March 2011
854:newspapers
703:Color code
434:series of
257:7–12
223:0.5 V
191:Electrical
185:Mini-DIN-6
109:Superseded
1925:PS/2 port
1920:Game port
1833:Fax modem
1672:Disk pack
1524:Trackball
1487:Light pen
1026:Bus mouse
931:talk page
618:Microsoft
451:IBM PC/AT
420:keyboards
412:PS/2 port
199:5 V
181:Connector
44:PS/2 port
1904:FireWire
1897:Obsolete
1863:Ethernet
1642:Speakers
1540:Keyboard
1514:Touchpad
1449:computer
1408:25 March
1158:14 March
1148:Hardware
1006:See also
793:Logitech
780:keyboard
775:/ 2715C
762:mini-DIN
747:/ 3395C
733:Function
727:Color /
586:Indigo 2
582:SGI Indy
550:Thinkpad
273:Protocol
157:External
91:Designed
81:Designer
65:Keyboard
1953:Related
1856:Current
1697:Blu-ray
1635:Plotter
1630:Printer
1613:Monitor
1589:Softcam
1497:Optical
1180:4 April
1127:14 June
925:Glasgow
868:scholar
769:
764:female
741:
729:Pantone
691:passive
621:PC 2001
608:, with
575:RS/6000
538:laptops
254:Bitrate
99: (
1811:MOSFET
1751:Memory
1618:Screen
1584:Webcam
1447:Basic
870:
863:
856:
849:
841:
773:Purple
760:6-pin
718:Compaq
590:Octane
564:RS-232
547:Lenovo
536:Older
475:serial
443:RS-232
331:Ground
283:Pinout
277:Serial
268:1 or 2
259:kbit/s
196:Signal
1930:eSATA
1848:Ports
1533:Other
1492:Mouse
1349:(PDF)
1264:(PDF)
1257:(PDF)
875:JSTOR
861:books
789:PC 97
778:PS/2
752:mouse
750:PS/2
745:Green
614:Intel
426:to a
362:Pin 6
356:Clock
349:Pin 5
336:Pin 4
325:Pin 3
315:Pin 2
307:+DATA
304:Pin 1
207:Earth
165:Cable
1888:HDMI
1804:SMPS
1792:SSHD
1786:NVMe
1782:SATA
1761:BIOS
1410:2012
1388:2006
1329:2016
1209:2015
1182:2011
1160:2007
1129:2011
1035:mice
847:news
674:The
650:BIOS
578:CHRP
440:DE-9
424:mice
422:and
410:The
352:+CLK
310:Data
237:Data
173:Pins
119:and
101:1987
94:1987
67:and
61:Type
1940:VGA
1935:DVI
1868:USB
1821:VRM
1778:SSD
1773:HDD
1756:RAM
1692:DVD
1555:GPU
1045:USB
1033:on
1019:on
986:ATX
830:by
610:USB
543:IBM
340:Vcc
328:GND
247:LSB
219:5.0
160:Yes
131:USB
85:IBM
1987::
1784:/
1687:CD
1351:.
1300:.
1217:^
1199:.
1146:.
1067:^
754:/
584:,
201:DC
152:No
115:,
1788:)
1780:(
1440:e
1433:t
1426:v
1413:.
1391:.
1369:.
1331:.
1304:.
1242:.
1228:.
1211:.
1184:.
1162:.
1131:.
941:)
937:(
933:.
927:.
897:)
891:(
886:)
882:(
872:·
865:·
858:·
851:·
824:.
616:/
545:/
221:±
176:6
137:)
133:(
103:)
38:.
20:)
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