==View or Print jumper settings using Fixedsys or New Courier fonts==
PT-428 486 VESA Motherboard
- BIOS ID string 40-0101-428054-00101111-111192-UMC491-H
- 8-30 pin SIMM slots (1-32meg FPM DRAM)
- 3-32bit VESA Local Bus slots
- 6-16bit ISA slots
- 1-8bit ISA slot
- 32-256k cache support in 8-28pin sockets + 1 TAG RAM socket
- AMI 486DX 1992 Bios
- UMC UM82C491F Chipset
- Supports 80486SX/DX/DX2,Pentium Overdrive at 25/33/40/50/66MHz
- Manufactured by: PINE TECHNOLOGY
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CONNECTIONS
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Purpose Location Purpose Location
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External battery J1 Speaker J5
Reset switch J2 Power LED + keylock J6
Turbo switch J3 32-bit VESA slots SL1,SL2+SL3
Turbo LED J4
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USER CONFIGURABLE SETTINGS
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Function Jumper Position
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Battery type external JP1 Closed
Battery type internal JP1 Open
Power signal detect from power supply JP2 1 + 2
Power signal detect from board JP2 2 + 3
VGA card select - normal JP3 1 + 2
VGA card select - POWER 9000 JP3 2 + 3
CPU test logic enabled JP6 Open
CPU test logic disabled JP6 Closed
(MCA1) LDEV# direct connect to 491 ELBA# JP7 1 + 2
LDEV# through and gate to 491 ELBA# JP7 2 + 3
CPU speed select < 33MHz JP11 Open
CPU speed select > 33MHz JP11 Closed
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DRAM CONFIGURATION
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Size Bank 0 Bank 1
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1MB (4) 256K x 9 NONE
2MB (4) 256K x 9 (4) 256K x 9
4MB (4) 1M x 9 NONE
5MB (4) 1M x 9 (4) 256K x 9
8MB (4) 1M x 9 (4) 1M x 9
16MB (4) 4M x 9 NONE
20MB (4) 1M x 9 (4) 4M x 9
32MB (4) 4M x 9 (4) 4M x 9
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CACHE CONFIGURATION
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Size Bank 0 Bank 1 TAG
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32KB (4) 8K x 8 NONE (1) 8K x 8
64KB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8
128KB (4) 32K x 8 NONE (1) 8K x 8
256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8
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CACHE JUMPER CONFIGURATION
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Size JP12 JP13 JP14 JP15 JP16
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32MB Open 2 + 3 Open Open Open
64KB Open I + 2 Open Closed Open
128KB 2 + 3 2 + 3 Open Closed Closed
256KB 1 + 2 1 + 2 Closed Closed Closed
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CPU TYPE CONFIGURATION
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CPU Type J17 J18
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80486SX 2 + 3 closed Open
80486DX/DX2 1, 2, 3 + 4 closed 1 + 2 closed
Pentium Overdrive 1, 2, 3 + 4 closed 2 + 3 closed
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CPU SPEED CONFIGURATION (CHRONTEL CH9007C CLOCK)
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Speed JP8 JP9
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25MHz 1 + 2 closed 1 + 2 closed
33MHz 2 + 3 closed 1 + 2 closed
40MHz 1 + 2 closed 2 + 3 closed
50iMHz 1 + 2 closed 1 + 2 closed
50MHz 2 + 3 closed 2 + 3 closed
66iMHz 2 + 3 closed 1 + 2 closed
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CPU SPEED CONFIGURATION (PHASE LINE PLL52C05)
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Speed JP8 JP9 JP21
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25MHz 1 + 2 closed 1 + 2 closed Closed
33MHz 2 + 3 closed 1 + 2 closed Closed
40MHz 1 + 2 closed 2 + 3 closed Open
50iMHz 1 + 2 closed 1 + 2 closed Closed
50MHz 2 + 3 closed 2 + 3 closed Open
66iMHz 2 + 3 closed 1 + 2 closed Closed
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VESA ID4 CONFIGURATION
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50MHz delay JP4 JP5
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No delay 1 + 9 closed 1 + 2 closed
1 - T 2 + 3 closed 2 + 3 closed
======================END OF DATA ON PT-428============================
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