CPU: 80386-33MHz

COPROCESSORS: 80387-33MHz and WEITEK 3167-33MHz

MEMORY ONBOARD 4MB EXPANDABLE 24MB

CACHE MEMORY 64KB SRAM
I/O PORTS 1-25 PIN PARALLEL, 2-9PIN SERIAL

FLOPPY DISK DRIVE 5.25" 1.2MB, 3.5" 1.44MB

OPERATING SPEED 33MHz / 8MHz KEYBOARD SELECTABLE

POWER SUPPLY 275 WATTS

SAMSUNG Electronics Service Manual SD840 Series (PDF - 299 pages - 10.95Mb)



User's Guide Installation Guide and VGA Utility Guide (PDF - 136 pages - 4.93Mb) 98134-716-006

SD840 motherboard schematic (PDF - 33 pages - 1.39Mb)

INTEGRATED CIRCUITS:

U41,49 : IC EPROM 27C256-20 (SIG)

U6, 7 : IC SRAM (PLCC) V63C328J03 (VITELIC) 8Kx16 35nS Cache Static RAM - Cache for 80386, 33MHz

U18, 19 : IC SRAM (PLCC) V63C328J03 (VITELIC) 8Kx16 35nS Cache Static RAM - Cache for 80386, 33MHz

U36 : IC CPU MEMORY CONTROLLER GC132C (LSI LOGIC)

U33 : IC GLUE (PLCC) L4A8024 (LSI LOGIC)

U5 : IC CACHE CONTROLLER ; A38202 33 QFP (AUSTEK)

U42 : IC RTC ; DS1287 (DALLAS)

U37 : IC BRIDGE INTERFACE GC133B (LSI LOGIC)

U30 : IC PERIPHERAL CONTROLLER; GC131B (LSI LOGIC)

U50: IC CPU; D8742 (INTEL/SSI)

U8 : IC CPU; 80386DX 33, PGA (INTEL)

U67 : IC FDC; DP8473 (PLCC) (NS)

U67 : IC FDC; DP8471 (PLCC) (NS)

U16 : IC TTL (SMD) 74AC1240 (NS)

U66 : IC TTL (SMD) SN74LS06 (TI)

U32 , 40 : IC TTL (SMD) SN74LS08 (TI)

U34 : IC TTL (SMD) SN74LS14D (TI)

U63, 78 : IC TTL (SMD) SN74LS32 (TI)

U65 : IC TTL (SMD) SN74LS74AD (TI)

U74 : IC TTL (SMD) SN74LS244D (TI)

U39, 48 : IC TTL (SMD) SN74LS245D (TI)

U69, 72 : IC TTL (SMD) SN74LS245D (TI)

U24 : IC TTL (SMD) 74F04 (NS)

U35 : IC TTL (SMD) 74F08 (NS)

U1, 3 : IC TTL (SMD) 74F32SC (NS)

U56, 57 : IC TTL (SMD) 74F32SC (NS)

U79 : IC TTL (SMD) 74F32SC (NS)

U13 : IC TTL (SMD) N74F74D (SIG)

U54, 55 : IC TTL (SMD) N74F138D (SIG)

U58, 59 : IC TTL (SMD) N74F138D (SIG)

U31 : IC TTL (SMD) 74F175SC (NS)

U38 : IC TTL (SMD) 74F244SC (NS)

U43-45 : IC TTL (SMD) 74F244SC (NS)

U51-53 : IC TTL (SMD) 74F244SC (NS)

U60-62 : IC TTL (SMD) 74F244SC (NS)

U20-23: IC TTL (SMD) SN74AS374 (TI)

U26-29 : IC TTL (SMD) DM74AS646 (NS)

U77 : IC CUSTOM 170 (PLCC); 82C452A (SIG) / VL16C452

U64, 68 : IC PAL (PLCC); PAL16L8ACNL (MMI)

U9 : IC PAL (PLCC); PAL16L8ECN (MMI)

U10,11 : IC PAL; PAL20L8ECN (MMI)

U71, 73 : IC DRIVER (SMD) SN75188D (TI)

U70 : IC RECEIVER (SMD) SN75189D (TI)

U75,76 : IC RECEIVER (SMD) SN75189D (TI)



SAMSUNG Model: PS-7 switching Power Supply

other links:

http://www.bitsavers.org/components/intel/80386/

http://www.bitsavers.org/components/national/_dataSheets/DP8473/

http://datasheets.chipdb.org/Intel/x86/386/

http://www.nj7p.org/Manuals/PDFs/Intel/240725-001.pdf Intel AP-442 application note 33MHz 386 System Design Considerations

Samsung SD830 computer

SD830 386/33 MHZ

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