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 | |