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Z-157 MODEL 2/MODEL 3

ZENITH DATA SYSTEMS

Z-157 MODEL 2/MODEL 3

Processor

8088

Processor Speed

4.77MHz

Chip Set

Unidentified

Max. Onboard DRAM

640KB

Cache

None

BIOS

Unidentified

Dimensions

254mm x 218mm

I/O Options

Parallel port/keyboard slot

NPU Options

8087

CONNECTIONS

Purpose

Location

Propietary parallel port/keyboard slot

S1

USER CONFIGURABLE SETTINGS

Function

Switch

Position

RAM parity checking enabled

SW1/2

On

 

RAM parity checking disabled

SW1/2

Off

RAM over 256KB on mother board

SW1/3

On

 

RAM over 256KB on external memory card

SW1/3

Off

Parallel port enabled

SW1/6

On

 

Parallel port disabled

SW1/6

Off

Floppy controller enabled

SW1/7

On

 

Floppy controller disabled

SW1/7

Off

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

512KB

(9) 41256

(9) 41256

NONE

640KB

(9) 41256

(9) 41256

(9) 4164

BOOT CONFIGURATION

Setting

SW1/0

SW1/1

MFM-150 Monitor RAM

Off

Off

MFM-150 Monitor RAM

On

On

Floppy disk

Off

On

Hard Drive

On

Off

MONITOR CONFIGURATION

Setting

SW1/4

SW1/5

Monochrome

Off

Off

CGA

On

Off

EGA

On

On

MISCELLANEOUS TECHNICAL NOTE

Note: Position 1 on SW1 is unidentified.