XEN-LS II Motherboard Layout

XEN-LS II (Samurai) Motherboard Layout (Rev 1.1.18)

RAM Configurations

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

Ethernet Options

On-Board Thick, Thin and UTP Ethernet.
Optional IBM 4/16Mbit/sec Token Ring adapter (XB41248).

Drives

80MB	Quantum ELS85AT	P/N 15006431
120MB	Quantum ELS127AT	P/N 15006531
170MB	Quantum LPS 170 AT	P/N SU52565
202MB	Maxtor 7213A	P/N 15006631
270MB	Quantum LPS 270 AT	P/N SU52577
515MB	Maxtor MXT540AL	P/N 15006731
540MB	Quantum LPS 540 AT	P/N SU52578

	2MB 3.5" Floppy	P/N KR47541
	Panasonic 5.25" Floppy Drive	P/N SA50159
	Internal 5.25" Floppy Drive	P/N SU52600

Sony	SLCD CD-ROM Drive	P/N SA50158
Sony	dual-scan CD-ROM Drive	P/N SA52537
	SCSI CD-ROM Drive	P/N SU52732

150MB	Tape Drive	P/N SU52602
525MB	Tape Drive	P/N SU50639
4520NT	DAT Drive	P/N SU50640
2-8GB	DDS DAT	P/N SU52593

Switch Settings

**SW1 - Bus Speed**
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 (Rev F only)**
Jumper Position	Function
Closed	Enabled
Open	Disabled

Additional Options

Apricot LOC Technology security system
Single Chip VGA with 1MB of RAM and up to 1024 x 768 x 256 resolution.
Microsoft Windows 3.1 Professional Audio Support.
PS/2 Mouse

Rear Panel

1	Power out	6	UTP	11	Mouse
2	Voltage Selection	7	Monitor	12	Joystick/MIDI
3	Power in	8	Serial	13	Audio in
4	Thin Ethernet	9	Parallel	14	Audio out
5	Thick Ethernet	10	Keyboard	15	Security Loop

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

Interrupts, DMA and Memory

**Interrupts (IRQ)**
Interrupts	Default Function	Notes
IRQ 0	System	This cannot be used by an expansion card.
IRQ 1	Keyboard controller	This cannot be used by an expansion card.
IRQ 2	Slave interrupt cont.	This cannot be used at the same time as IRQ9.
IRQ 3	Serial port 2	Available if this feature is disabled in SETUP.
IRQ 4	Serial port 1	Available if this feature is disabled in SETUP.
IRQ 5	SLCD CD-ROM	Available if this feature is disabled in SETUP.
IRQ 6	Floppy disk controller	Available if this feature is disabled in SETUP.
IRQ 7	Parallel port	IRQ 7 is not normally used, and can be used by expansion cards
IRQ 8	Real time clock	This cannot be used by an expansion card.
IRQ 9	Video controller	This is not normally used by the on-board video.
IRQ 10	596 Ethernet	Available if this feature is disabled in SETUP.
IRQ 11	LOC Technology	This cannot be used by an expansion card.
IRQ 12	Mouse	This cannot be used by an expansion card.
IRQ 13	Co processor	This cannot be used by an expansion card.
IRQ 14	Hard disk controller	Available if this feature is disabled in SETUP.
IRQ 15	Audio system	Available if this feature is disabled in SETUP.

**DMA Channels**
Channel	Default Function	Notes
DMA 0	SLCD CD-ROM	Available if this feature is disabled in SETUP.
DMA 1	Audio channel A	Available if this feature is disabled in SETUP.
DMA 2	Floppy disk controller	This cannot be used by an expansion card.
DMA 3	Audio channel B	Available if this feature is disabled in SETUP.
DMA 4	System	This cannot be used by an expansion card.
DMA 5	Not used
DMA 6	Not used
DMA 7	Not used

**New Jumpers on 'F3' Samurai Motherboards**
PL100	Audio Device DMA Control Jumper for DACK3	These are here for occasions
PL101	Audio Device DMA Control Jumper for DRQ3	where the DMA channels
PL102	Audio Device DMA Control Jumper for DACK1	have to be freed.
PL103	Audio Device DMA Control Jumper for DRQ1	"
PL105	Hardware Interrupt for the SLCD-ROM Interface	Remove Jumper to free the interrupt completely.

Memory Map

Setup Screens