Apple Macintosh Keyboard Connections




Keyboard Connections
PIN DESCRIPTION
1 Chassis ground
2 Keyboard clock
3 Keyboard data
4 +5 VDC



Apple Macintosh and Newton serial connection, Miniature DIN-8 jack (female)


PinRS-422 signal nameDirectionRemarks
1Handshake output DTRHSKoVoltage from Mac
2Handshake input CTSHSKiInput to Mac
3Transmit data -TxD-Voltage from Macused for connection to RS-232
4Frame groundGND
5Receive data -RxD-Input to Macused for connection to RS-232
6Transmit data +TxD+Voltage from Macnot used for RS-232
7Gen. Purpose Input or no connectionGPiInput to Maccould be connected to DCD on modem
8Receive data +RxD+Input to Macground connection for RS-232



MINI DIN 8M/DB9F MAC-PC CABLE (Apple Mac to Serial Adapter Cable / mini DIN 8-pin male to Sub-D DB-9 female)


DIN-8 Male PinDB-9 Female PinPC Signal NameRemarks
16DSRHandshake from Mac to PC
2 (or 2 and 7)4DTRHandshake from PC to Mac
32Receive dataData from Mac to PC
4 (or 4 and 8)5Ground
53Transmit dataData from PC to Mac



Mac or Newton to IBM PC (25-pin) cable


DIN-8 Male PinDB-25 Female PinPC Signal NameRemarks
16DSRHandshake from Mac to PC
2 and 720DTRHandshake from PC to Mac
33Receive dataData from Mac to PC
4 and 87Signal ground
52Transmit dataData from PC to Mac
No connection4, 5RTS, CTSJumper in connector on PC end