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386sx Mainboard - 001

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wandjiwilfried9
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48 views3 pages

386sx Mainboard - 001

Uploaded by

wandjiwilfried9
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF or read online on Scribd
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M396F 386sx Mainboard User's Guide Jumper, Connector, and Socket Locations = om JP1 Power Connector g P2 = Ss 4||| 3 a ee JP1O mo y a co [Po ° Coa cao oo Ss = Boch JP3 JP4 JPS JP6 JP7 JP8 KEY FEATURES e@ Single chip for 386SX or CX486SLC 25/33/40 MHZ system e Socket support for 80387SX coprocessor @ Page mode and block interleave DRAM management © Memory configurations from 512KB to 16MB using combina- tions of 256KB,512K,1M and 4M SIMM modules Support hardware and software turbo switch Support shadow RAM for system and video BIOS Six 16-bit I/O slots External and rechargeable battery-backed CMOS RAM for real time clock and system configuration e PCB with dimensions of 220mm x 170mm JUMPER SETTING AND CONNECTORS JP1. External battery connector Pin 1: VDD(6V) Pin 4: Gnd Pin 2,3: Rechargeable battery pin Note:To clear the CMOS configuration, place ajumper cap on pin3-4 and then place the cap back on pin 2-3 for normal operation. JP2. Display type select Close: Color Open: Monochrome JP3. Power LED and keylock connector Pin 1: LED power Pin 2: Not used Pin 3: Gnd Pin 4: Keyboard inhibiter Pin 5: Gnd JP4, Speaker connector Pin 1: Data out Pin 2: Not used Pin 3: Gnd Pin 4: +5Vdc JPS5. Turbo LED connector Pin 1: +Anode Pin 2: -cathode JP6. Turbo switch connector Close: Turbo speed Open: Low Speed You can also switch the clock speed using software control via keyboard commonds. CTRL,ALT,[+]:Press these three keys simultaneously to select Turbo Mode. CTRL,ALT,[— ]:Press these three keys simultaneously to select LOW Speed Mode. JP7. Reset connector Close: Reset Open: Not reset D JP8. 1-2: 40MHZ 2-3: 33M/25M/20M/16MHZ JP9,JP10. CPU clock select CLOCK Jp9 JP10 16 MHZ 12 1-2 25 MHZ 12 23 33 MHZ 23 12 40 MHZ 23 23 MEMORY ARCHITECTURE The main board contains 2 banks of memory. A total of 8 modes are available. DRAM TYPE TOTAL MODE BANKO BANK1 MEMORY 1 256K x 512KB 2 256K 256K 1MB 3 512K x 1MB 4 512K 512K 2MB 5 1M x 2MB 6 1M 1M 4MB 7 4M x 8MB 8 4M 4M 16MB 33 we 12 34 S67 9 ® 20 Q Lox i Down : eooed, N5 aae a eee 8B 4 rom Back “/maciie “iw Ht $5 (Bar) °° = s2

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