ZENITH DATA SYSTEMS
MULTIPORT I/O CARD
| 
 Card Type  | 
 Multi-I/O  | 
| 
 Chipset/Controller  | 
 Unidentified  | 
| 
 I/O Options  | 
 Parallel, serial I/O via DB-37 port  | 
| 
 Maximum DRAM  | 
 N/A  | 
| 
 CONNECTIONS  | |
| 
 Purpose  | 
 Location  | 
| 
 Parallel and serial I/O DB-37 port  | 
 CN1  | 
| 
 SERIAL RECEIVE CLOCK  | ||
| 
 » Setting | 
 J10  | |
| » | 
 External clock  | 
 Pins 2 & 3 closed  | 
| » | 
 Internal clock  | 
 Pins 1 & 2 closed  | 
| 
 SERIAL TRANSMIT CLOCK  | ||
| 
 » Setting | 
 J11  | |
| » | 
 External clock  | 
 Pins 1 & 2 closed  | 
| » | 
 Internal clock  | 
 Pins 2 & 3 closed  | 
| 
 MISCELLANEOUS TECHNICAL NOTES  | 
| 
 The DB-37 port is designed to connect to a "breakout box" consisting of two DB-25 external connectors for parallel and serial I/O.  |