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XEN-PC (Samurai) Motherboard Layout (Rev 1.1.4)

 



RAM Configuration

On-board RAM

SIMM Socket 1

SIMM Socket 2

Product Code

Total RAM

4MB

-

-

-

4MB

4MB

4MB

-

SA50484

8MB

4MB

4MB

4MB

2 x SA50484

12MB

4MB

8MB

-

SA50485

12MB

4MB

8MB

4MB

SA50485/4

16MB

4MB

8MB

8MB

2 x SA50485

20MB

4MB

16MB

-

SA50486

20MB

4MB

16MB

4MB

SA50486/4

24MB

4MB

16MB

8MB

SA50486/5

28MB

4MB

16MB

16MB

2 x SA50486

36MB

4MB

32MB*

-

SA50487

36MB

4MB

32MB*

4MB

SA50487/4

40MB

4MB

32MB*

8MB

SA50487/5

44MB

4MB

32MB*

16MB

SA50487/6

52MB

4MB

32MB*

32MB*

2 x SA50487

64MB**

 * NB. The 32MB SIMM for Samurai is Apricot specific and is not a standard part
** On-board memory automatically disabled

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Ethernet Options

3Com Ethernet card, thin/thick (3C503) XB50902
3Com Ethernet card, UTP/thick (3C503B-TP) XB50901
3Com triple-combo (thick/thin/UTP) Ethernet card (3C509) XB51623
3Com AUI to UTP Transceiver (3C583) XB50900
IBM 4/16Mbit/sec Token Ring adapter XB41248

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Disk Drives

80MB Quantum ELS85AT SU50633
160MB Quantum ELS170AT SU51364
170MB Quantum LPS 170 AT SU52565
240MB Quantum LPS 240AT SU51365
270MB Quantum LPS 270 AT SU52577
540MB Quantum LPS 540 AT SU52578
2MB 3.5" Floppy KR47541
5.25" Panasonic Floppy Drive SA50159
5.25" Panasonic Floppy Drive SU52600
Sony SLCD CD-ROM Drive SA50158
Sony SLCD dual scan CD-ROM SA52537
Sony SCSI CD-ROM Drive SU52732
120MB Internal Tape Drive SU50637
150MB SCSI Tape Drive SU50638
525MB SCSI Tape Drive SU50639
1.3GB DDS SCSI DAT Drive SU50640
2-8GB DDS DAT Drive SU52593

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Switch Settings

SW1
Switch Position Bus Speed
10 MHz
8 MHz

 

SW4 Processor Speed

Switch 1

Switch 2

Switch 3

Speed

On

On

On

16MHz

On

On

Off

20MHz

On

Off

On

25MHz

Off

On

On

32MHz

On

Off

Off

33.3MHz

Off

On

Off

40MHz

Off

Off

On

50MHz

Off

Off

Off

66.6MHz

 

SW4 Processor Type (installed in the upgrade socket)

Switch 4

Switch 5

Type

On

Off

SX

Off

On

DX/DX2

Off

Off

487SX/Overdrive

 

SW4 Diagnostics Enable

Switch 6

 

On

Enable

Off

Disable

 

PL41 Hard Disk DMA Enable
Fitted Support DMA transfers to the hard disk
Not Fitted DMA not used

 

PL12 Colour Mono Monitor Select
Fitted Mono Monitor Used
Not Fitted Colour Monitor Used

 

PL29 CMOS RAM Clear (3 Pin Jumper)

Jumper Position

Function

Pins 1 and 2 Jumpered

Normal Use

Pins 2 and 3 Jumpered

Clear CMOS

 

PL50 On-Board Video

Jumper Position

Function

Closed

Enabled

Open

Disabled

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Additional Options

AdLOC (AT/Micro Channel) Security system

Triplex modem - internal modem card V21, V22 & V23 XB8762

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Rear Panel

1 Power out 6 Parallel
2 Voltage Selection 7 Keyboard
3 Power in 8 Mouse
4 Monitor 9 Security Loop
5 Serial    

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CMOS Discharge

PL29 CMOS RAM Clear (3 Pin Jumper)

Jumper Position

Function

Pins 1 and 2 Jumpered

Normal Use

Pins 2 and 3 Jumpered

Clear CMOS

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Computing for a Connected World