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)
| Pin | RS-422 signal name | | Direction | Remarks |
| 1 | Handshake output DTR | HSKo | Voltage from Mac |
| 2 | Handshake input CTS | HSKi | Input to Mac |
| 3 | Transmit data - | TxD- | Voltage from Mac | used for connection to RS-232 |
| 4 | Frame ground | GND |
| 5 | Receive data - | RxD- | Input to Mac | used for connection to RS-232 |
| 6 | Transmit data + | TxD+ | Voltage from Mac | not used for RS-232 |
| 7 | Gen. Purpose Input or no connection | GPi | Input to Mac | could be connected to DCD on modem |
| 8 | Receive data + | RxD+ | Input to Mac | ground 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 Pin | DB-9 Female Pin | PC Signal Name | Remarks |
|---|
| 1 | 6 | DSR | Handshake from Mac to PC |
| 2 (or 2 and 7) | 4 | DTR | Handshake from PC to Mac |
| 3 | 2 | Receive data | Data from Mac to PC |
| 4 (or 4 and 8) | 5 | Ground |
| 5 | 3 | Transmit data | Data from PC to Mac |
Mac or Newton to IBM PC (25-pin) cable
| DIN-8 Male Pin | DB-25 Female Pin | PC Signal Name | Remarks |
|---|
| 1 | 6 | DSR | Handshake from Mac to PC |
| 2 and 7 | 20 | DTR | Handshake from PC to Mac |
| 3 | 3 | Receive data | Data from Mac to PC |
| 4 and 8 | 7 | Signal ground |
| 5 | 2 | Transmit data | Data from PC to Mac |
| No connection | 4, 5 | RTS, CTS | Jumper in connector on PC end |
