Qi 600 (Neptune Motherboard) Revision 'G' (Rev 1.1.20)

RAM Configuration
Ethernet Options
Disk Drives
Switch Settings
Additional Options
Rear Panel
CMOS Discharge



RAM Configuration

Switches

SIMM Capacity

Memory Fitted

1

2

3

Bank 0

Bank 1

1 MByte

Off

Off

Off

256k

-

1 MByte

On

Off

Off

256k

-

2 MByte

Off

On

Off

256k

256k

4 MByte

Off

Off

On

1 M

-

5 MByte

On

On

Off

256k

1 M

8 MByte

On

Off

On

1 M

1 M

12 MByte

Off

On

On

2 M

1 M

16 MByte

On

On

On

2 M

2 M


Disk Drives

MB Make Model Type Part Number
49 Seagate ST-157R 46 RLL 14004311
50 Quantum LPS52S SCSI 14588431
100 Quantum LPS105S SCSI 14588331
118 CDC/Seagate ST-1150R 36 RLL 14118411

Tape Drives

MB Make Model Type Part Number
40 Irwin 3.5" XB45915

Floppy Drives

MB Make Model Type Part Number
2 MB 3.5"

Ethernet Options

On Board Thin and Thick Ethernet. 


Switch Settings

SW1

Switch

On

Off

1

Pipeline 386 enable

Pipeline 386 disable

2

Pipeline 385 enable

Pipeline 385 disable

3

ROM's disabled

ROM's enabled

4

Refresh enabled

Refresh disabled

 

SW2

Switch

On

Off

1

RAM configuration

2

RAM configuration

3

RAM configuration

4

CPU speed select

5

CPU speed select

6

Not currently used

7

*Weitek present

Weitek not present

8

Not currently used

* PAL required to enable

 

RAM
 

Switches

SIMM Capacity

Memory Fitted

1

2

3

Bank 0

Bank 1

1 MByte

Off

Off

Off

256k

-

1 MByte

On

Off

Off

256k

-

2 MByte

Off

On

Off

256k

256k

4 MByte

Off

Off

On

1 M

-

5 MByte

On

On

Off

256k

1 M

8 MByte

On

Off

On

1 M

1 M

12 MByte

Off

On

On

2 M

1 M

16 MByte

On

On

On

2 M

2 M

 

Clock Speed

CPU speed MHz

Switches

 

4

5

25 MHz

Off

On

 

SW3

Position

 

A

Routes high resolution video clocks

B

High resolution video required

 

SW4

Position

 

A

Routes composite sync pulses to the Video DAC

B

Composite sync pulses required

 

SW53 Ethernet Configuration
All ON - BNC connector enabled All OFF - D-type connector enabled

 


Additional Options

Apricot LOC Technology security.
Co - Processor
80387DX
IC153 Replace with PAL N387153VB P/N 12156131
IC155 Replace with PAL N387029VF P/N 12164031
If the label on original PAL in IC29 finishes with D or E then do not replace.

Rear Panel


CMOS Discharge

To drain CMOS remove the battery and connect a 10 Ohm resistor between TP13 and TP14.

If no resistor is available then it will take approx. 20 minutes to drain.



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