ZENITH DATA SYSTEMS
Z-2500 SERIES
| 
 Processor  | 
 80286  | 
| 
 Processor Speed  | 
 12MHz  | 
| 
 Chip Set  | 
 Unidentified  | 
| 
 Video Chip Set  | 
 None  | 
| 
 Maximum Onboard Memory  | 
 6MB  | 
| 
 Maximum Video Memory  | 
 None  | 
| 
 Cache  | 
 None  | 
| 
 BIOS  | 
 Unidentified  | 
| 
 Dimensions  | 
 330mm x 218mm  | 
| 
 I/O Options  | 
 None  | 
| 
 NPU Options  | 
 80287  | 
| 
 USER CONFIGURABLE SETTINGS  | |||
| 
 Function  | 
 Label  | 
 Position  | |
| 
 »  | 
 Factory configured - do not alter  | 
 J101  | 
 Open  | 
| 
 »  | 
 NPU clock mode select mode /3 for 80287, /2 for 80C287  | 
 J103  | 
 Closed  | 
| 
 NPU clock mode select direct mode  | 
 J103  | 
 Open  | |
| 
 Parallel printer decode  | 
 J106  | 
 Unidentified  | |
| 
 »  | 
 ROM DMA blocked  | 
 J113  | 
 Pins 1 & 2 closed  | 
| 
 ROM DMA not blocked  | 
 J113  | 
 Pins 2 & 3 closed  | |
| 
 »  | 
 Speaker enabled  | 
 J114  | 
 Closed  | 
| 
 Speaker disabled  | 
 J114  | 
 Open  | |
| 
 DRAM CONFIGURATION  | ||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
| 
 1MB  | 
 (4) 256K x 9  | 
 None  | 
| 
 3MB  | 
 (4) 256K x 9  | 
 (2) 1M x 9  | 
| 
 6MB  | 
 (4) 1M x 9  | 
 (2) 1M x 9  | 
| 
 DRAM TYPE SELECTION  | |
| 
 Type  | 
 J102  | 
| 
 256K x 9 in Bank 0  | 
 Pins 2 & 3 closed  | 
| 
 1M x 9 in Banks 0 & 1  | 
 Pins 1 & 2 closed  | 
| 
 SCP SPEED SELECTION  | ||
| 
 Speed  | 
 P113  | |
| 
 7.16MHz  | 
 Pins 1 & 2 closed  | |
| » | 
 8MHz  | 
 Pins 5 & 6 closed  | 
| 
 12MHz  | 
 Pins 3 & 4 closed  | |
| 
 NPU SPEED SELECTION  | ||||
| 
 Clock speed  | 
 80287  | 
 80C287  | 
 P113  | |
| 
 8MHz  | 
 2.7MHz  | 
 4MHz  | 
 Pins 9 & 10 closed  | |
| » | 
 16MHz  | 
 5.3MHz  | 
 8MHz  | 
 Pins 13 & 14 closed  | 
| 
 24MHz  | 
 8MHz  | 
 12Hz  | 
 Pins 7 & 8 closed  | |
| 
 Note: See also J103 setting.  | ||||
| 
 POACH SELECTION  | |||
| 
 Setting  | 
 J115  | 
 J116  | |
| » | 
 POACH 1 chip installed in U169  | 
 Pins 2 & 3 closed  | 
 Pins 2 & 3 closed  | 
| 
 POACH 7 chip installed in U169  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | |