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Z-2500 SERIES

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