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PC916SX

NCR CORPORATION

PC916SX

Processor

80386SX

Speed

16MHz

Chip Set

Unidentified

Max. Onboard DRAM

1MB

BIOS

Unidentified

Cache

None

Dimensions

290mm x 106mm

I/O Options

External memory card slot

NPU Options

80387SX

CONNECTIONS

Purpose

Location

Purpose

Location

External Battery

J2

Keyboard connector

J5

Turbo LEDs & keylock

J3

Proprietary external memory port

P11 & P12

Speaker & volume control

J4

   

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

Pipeline mode disabled

JP3-I/JP3-II

pins 2 & 3 closed

 

Pipeline mode enabled

JP3-I/JP3-II

pins 1 & 2 closed

Monitor type select color

S1

pins 1 & 2 closed

 

Monitor type select monochrome

S1

pins 2 & 3 closed

Power-on speed select fast

S2

pins 1 & 2 closed

Power-on speed select slow

S2

pins 2 & 3 closed

DRAM speed select slow

SW3/1

Off

 

DRAM speed select fast

SW3/1

On

DMA speed select automatic

SW3/2

Off

 

DMA speed select 8MHz

SW3/2

On

Memory 0-512KB enabled

SW3/3

Off

 

Memory 0-256KB enabled, 256-512KB disabled

SW3/3

On

Memory 512-1024KB enabled

SW3/4

Off

 

Memory 512-1024KB disabled

SW34

On

 

Notes:JP3-I is found on Type MMI mainboard, JP3-II is found on Type MMII mainboard.

DRAM CONFIGURATION

Size

Bank 0

1MB

(8) 44256

Note:Memory chip sizes and locations are unidentified.

DRAM - I/O SPEED CONFIGURATION

IOW, MEMW, MEMR

IOR

JP1

JP2

500ns

750ns

pins 2 & 3 closed

pins 1 & 2 closed

 

250ns

500ns

pins 2 & 3 closed

pins 2 & 3 closed

 

750ns

1000ns

pins 1 & 2 closed

pins 2 & 3 closed

 

1000ns

1250ns

pins 1 & 2 closed

pins 1 & 2 closed

DRAM MAPPING CONFIGURATION

Extended memory

Mapping area

SW3/5

SW3/6

SW3/7

SW3/8

0MB

100000 - 160000h

Off

On

On

On

1MB

200000 - 260000h

On

Off

On

On

2MB

300000 - 360000h

Off

Off

On

On

3MB

400000 - 460000h

On

On

Off

On

4MB

500000 - 560000h

Off

On

Off

On

5MB

600000 - 660000h

On

Off

Off

On

6MB

700000 - 760000h

Off

Off

Off

On

7MB

800000 - 860000h

On

On

On

Off

8MB

900000 - 960000h

Off

On

On

Off

9MB

A00000 - A60000h

On

Off

On

Off

10MB

B00000 - B60000h

Off

Off

On

Off

11MB

C00000 - C60000h

On

On

Off

Off

12MB

D00000 D60000h

Off

On

Off

Off

13MB

E00000 - E60000h

On

Off

Off

Off

14MB

F00000 - F60000h

Off

Off

Off

Off