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P55-TH
EPOX COMPUTER CO., LTD.
P55-TH
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Processor
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CX M1/Pentium
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Processor Speed
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75/90/100/120/133/150/166/180/200MHz
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Chip Set
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Intel
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Video Chip Set
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None
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Maximum Onboard Memory
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512MB (EDO supported)
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Maximum Video Memory
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None
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Cache
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256/512KB
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BIOS
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Award
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Dimensions
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330mm x 218mm
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I/O Options
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32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), cache slot, IR connector
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NPU Options
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None
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CONNECTIONS
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Purpose
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Location
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Purpose
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Location
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Serial port 1
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CN1
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Green PC LED
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J6
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Serial port 2
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CN2
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Chassis fan power
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J7
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Parallel port
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CN3
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PS/2 mouse interface
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J10
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Floppy drive interface
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CN4
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IR connector
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J33
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IDE interface 2
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CN5
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Turbo switch
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J44
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IDE interface 1
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CN6
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IDE interface LED
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JP5
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Power LED & keylock
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J1
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Green PC connector
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JP14
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Speaker
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J2
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32-bit PCI slots
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PC1 - PC4
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Reset switch
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J3
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Cache slot
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SL1
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USER CONFIGURABLE SETTINGS
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Function
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Label
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Position
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»
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SMC chip enabled
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J24
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Open
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SMC chip disabled
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J24
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Closed
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Flash BIOS voltage select 12v
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JP6
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Pins 2 & 3 closed
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Flash BIOS voltage select 5v
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JP6
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Pins 1 & 2 closed
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»
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Flash BIOS normal operation
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JP8
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Pins 1 & 2 closed
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Flash BIOS boot block enabled
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JP8
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Pins 2 & 3 closed
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»
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Factory configured - do not alter
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JP12
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Unidentified
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»
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Clock rate set as AT CLOCK
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JP15
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Pins 1 & 2 closed
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Clock rate set as 12MHz
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JP15
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Pins 2 & 3 closed
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DRAM CONFIGURATION
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Size
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Bank 0
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Bank 1
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8MB
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(2) 1M x 36
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None
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16MB
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(2) 1M x 36
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(2) 1M x 36
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16MB
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(2) 2M x 36
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None
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24MB
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(2) 2M x 36
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(2) 1M x 36
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32MB
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(2) 2M x 36
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(2) 2M x 36
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32MB
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(2) 4M x 36
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None
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40MB
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(2) 4M x 36
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(2) 1M x 36
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48MB
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(2) 2M x 36
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(2) 4M x 36
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64MB
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(2) 4M x 36
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(2) 4M x 36
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64MB
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(2) 8M x 36
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None
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72MB
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(2) 8M x 36
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(2) 1M x 36
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80MB
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(2) 8M x 36
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(2) 2M x 36
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96MB
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(2) 4M x 36
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(2) 8M x 36
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96MB
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(2) 8M x 36
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(2) 4M x 36
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128MB
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(2) 8M x 36
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(2) 8M x 36
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256MB
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(2) 16M x 36
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(2) 16M x 36
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512MB
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(2) 32M x 36
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(2) 32M x 36
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Note: Board accepts EDO memory. Board also accepts x 32 SIMMs. Banks are interchangeable.
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CACHE CONFIGURATION
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Size
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Bank 0
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TAG
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SL1
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256KB (A)
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(2) 32K x 32
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(1) 32K x 8
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Not installed
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256KB (B)
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None
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None
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256KB module installed
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512KB (A)
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(2) 32K x 32
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(1) 32K x 8
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256KB module installed
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512KB (B)
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(2) 64K x 32
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(1) 32K x 8
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Not installed
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512KB (C)
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None
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None
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512KB module installed
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CACHE JUMPER CONFIGURATION
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Size
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JP10
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JP11
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256KB (A)
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Pins 1 & 2 closed
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Pins 1 & 2 closed
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256KB (B)
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Pins 1 & 2 closed
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Pins 2 & 3 closed
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512KB (A)
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Pins 1 & 2 closed
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Pins 1 & 2 closed
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512KB (B)
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Pins 2 & 3 closed
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Pins 1 & 2 closed
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512KB (C)
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Pins 1 & 2 closed
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Pins 2 & 3 closed
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CPU SPEED SELECTION (CYRIX)
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CPU speed
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Clock speed
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JP1
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100MHz
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66MHz
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Pins 10 & 23 closed
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120MHz
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60MHz
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Pins 4 & 17 closed
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133MHz
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66MHz
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Pins 5 & 18 closed
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CPU SPEED SELECTION (INTEL)
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CPU speed
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Clock speed
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JP1
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75MHz
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50MHz
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Pins 1 & 14 closed
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90MHz
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60MHz
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Pins 2 & 15 closed
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100MHz
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66MHz
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Pins 3 & 16 closed
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120MHz
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60MHz
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Pins 4 & 17 closed
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133MHz
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66MHz
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Pins 5 & 18 closed
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150MHz
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60MHz
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Pins 6 & 19 closed
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166MHz
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66MHz
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Pins 7 & 20 closed
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180MHz
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60MHz
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Pins 8 & 21 closed
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200MHz
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66MHz
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Pins 9 & 22 closed
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CPU TYPE SELECTION
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Type
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JP3A
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JP3B
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JP3C
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JP3D
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CX M1
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1 & 2
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1 & 2
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1 & 2
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1 & 2
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P54C/P54CS/P54CT/P54CTB
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1 & 2
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1 & 2
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1 & 2
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1 & 2
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P55C
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2 & 3
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2 & 3
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2 & 3
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2 & 3
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Note: Pins designated should be in the closed position.
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CPU AT BUS CLOCK SELECTION
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Setting
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J25
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PCICLK/4
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Pins 2 & 3 closed
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PCICLK/3
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Pins 1 & 2 closed
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