GMX, INC. ESA-MB Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2 Processor Speed 33/66(internal)MHz Chip Set National/INTEL Max. Onboard DRAM256MB SRAM Cache 64/128 (optional on CPU card only) BIOS AMI (located on CPU card) Dimensions 307.34mm x 330.20mm I/O Options Floppy drive interface, IDE interface, parallel port, proprietary CPU card, serial port (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location 8-bit ISA slot J9 Serial port (COM2) P7 Proprietary CPU card J10 Speaker P10 Keyboard interface P1 Turbo Switch P11 Floppy drive interface P2 Power LED & keylock P12 IDE interface P3 IDE interface LED P13 Auxiliary power P4 Reset switch P14 connector Parallel port P5 Lockable reset switch P15 Serial port (COM1) P6 USER CONFIGURABLE SETTINGS Function Jumper Position » IDE interface select IORDY at JA-2 pins 2 & 4 closed pin 21 IDE interface select IORDY at JA-2 pins 4 & 6 closed pin 27 » Watchdog strobe select 1.8MHz JA-4 pins 5 & 6 closed clock Watchdog strobe select host JA-4 pins 3 & 4 closed address strobe Watchdog strobe select signal JA-4 pins 1 & 2 closed watchdog » IDE interface address latch JA-5 Closed enabled at IDE pin 28 IDE interface address select JA-5 Open spindle sync at IDE pin 28 » ISA bus select 0 wait state JA-7 pins 1 & 3 open ISA bus select 1 wait state JA-7 pins 1 & 3 closed » Posted memory write cycles JA-7 pins 2 & 4 closed enabled Posted memory write cycles JA-7 pins 2 & 4 open disabled » Factory configured - do not JA-8 & JA-9 N/A alter » Keyboard buffer full interrupts JA-10 pins 2 & 3 closed from keyboard controller Keyboard buffer full interrupts JA-10 pins 1 & 2 closed from 82351 at IRQ1 » Address enable active on slot 0 JA-11 pins 1 & 2 closed & slot 8 (J9) Address enable active on slot 8 JA-11 pins 1 & 2 open (J9) only . Factory configured - do not JA-12 N/A alter » Factory configured - do not JA-13 N/A alter » Memory speed select speed 1 JA-14 pins 1 & 3 closed Memory speed select speed 0 JA-14 pins 2 & 4 closed » CMOS memory normal operation JA-15 pins 2 & 3 closed CMOS memory clear JA-15 pins 1 & 2 closed Floppy drive select 2 drives JA-17 Open Floppy drive select 3 drives JA-17 pins 1 & 2, 3 & 4 closed » UART type 16550 JA18 pins 1 & 2 closed UART type 16540 JA18 pins 2 & 3 closed » IDE interface select National JA-19 pins 1 & 2 closed chipset IDE interface Intel chipset JA-19 pins 2 & 3 closed » Floppy drive select National JA--20 pins 1 & 2 closed chipsey Floppy drive select Intel JA-20 pins 2 & 3 closed chipset » Keylock disabled JA-21 pins 2 & 3 closed Keylock enabled JA-21 pins 1 & 2 closed Note:SW1 & SW2 are software dependent. DRAM CONFIGURATION Size Bank0 Bank1 Bank2 Bank3 Bank4 Bank5 Bank6 Bank7 1MB 256K NONE NONE NONE NONE NONE NONE NONE 2MB 256K 256K NONE NONE NONE NONE NONE NONE 2MB 512K NONE NONE NONE NONE NONE NONE NONE 3MB 256K 256K 256K NONE NONE NONE NONE NONE 4MB 256K 256K 256K 256K NONE NONE NONE NONE 4MB 512K 512K NONE NONE NONE NONE NONE NONE 4MB 1M NONE NONE NONE NONE NONE NONE NONE 5MB 256K 256K 256K 256K 256K NONE NONE NONE 6MB 256K 256K 256K 256K 256K 256K NONE NONE 6MB 256K 256K 256K 256K 512K NONE NONE NONE 6MB 512K 512K 512K NONE NONE NONE NONE NONE 7MB 256K 256K 256K 256K 256K 256K 256K NONE 8MB 256K 256K 256K 256K 256K 256K 256K 256K 8MB 256K 256K 256K 256K 512K 512K NONE NONE 8MB 256K 256K 256K 256K 1M NONE NONE NONE 8MB 512K 512K 512K 512K NONE NONE NONE NONE 8MB 1M 1M NONE NONE NONE NONE NONE NONE 8MB 2M NONE NONE NONE NONE NONE NONE NONE 9MB 512K 512K 512K 512K 256K NONE NONE NONE 10MB 512K 512K 512K 512K 256K 256K NONE NONE 10MB 512K 512K 512K 512K 512K NONE NONE NONE 11MB 512K 512K 512K 512K 256K 256K 256K NONE 12MB 512K 512K 512K 512K 256K 256K 256K 256K 12MB 512K 512K 512K 512K 512K 512K NONE NONE 12MB 512K 512K 512K 512K 1M NONE NONE NONE 12MB 1M 1M 1M NONE NONE NONE NONE NONE 14MB 512K 512K 512K 512K 512K 512K 512K NONE 16MB 512K 512K 512K 512K 512K 512K 512K 512K 16MB 512K 512K 512K 512K 1M 1M NONE NONE 16MB 512K 512K 512K 512K 2M NONE NONE NONE 16MB 1M 1M 1M 1M NONE NONE NONE NONE 16MB 2M 2M NONE NONE NONE NONE NONE NONE 16MB 4M NONE NONE NONE NONE NONE NONE NONE 17MB 1M 1M 1M 1M 256K NONE NONE NONE 18MB 1M 1M 1M 1M 256K 256K NONE NONE 18MB 1M 1M 1M 1M 512K NONE NONE NONE 19MB 1M 1M 1M 1M 256K 256K 256K NONE 20MB 1M 1M 1M 1M 256K 256K 256K 256K 20MB 1M 1M 1M 1M 512K 512K NONE NONE 20MB 1M 1M 1M 1M 1M NONE NONE NONE 22MB 1M 1M 1M 1M 512K 512K 512K NONE 24MB 1M 1M 1M 1M 512K 512K 512K 512K 24MB 1M 1M 1M 1M 1M 1M NONE NONE DRAM CONFIGURATION (CONTINUED) Size Bank0 Bank1 Bank2 Bank3 Bank4 Bank5 Bank6 Bank7 24MB 1M 1M 1M 1M 2M NONE NONE NONE 24MB 2M 2M 2M NONE NONE NONE NONE NONE 28MB 1M 1M 1M 1M 1M 1M 1M NONE 32MB 1M 1M 1M 1M 1M 1M 1M 1M 32MB 1M 1M 1M 1M 2M 2M NONE NONE 32MB 1M 1M 1M 1M 4M NONE NONE NONE 32MB 4M 4M NONE NONE NONE NONE NONE NONE 32MB 8M NONE NONE NONE NONE NONE NONE NONE 32MB 2M 2M 2M 2M NONE NONE NONE NONE 33MB 2M 2M 2M 2M 256K NONE NONE NONE 34MB 2M 2M 2M 2M 256K 256K NONE NONE 34MB 2M 2M 2M 2M 512K NONE NONE NONE 35MB 2M 2M 2M 2M 256K 256K 256K NONE 36MB 2M 2M 2M 2M 256K 256K 256K 256K 36MB 2M 2M 2M 2M 512K 512K NONE NONE 36MB 2M 2M 2M 2M 1M NONE NONE NONE 38MB 2M 2M 2M 2M 512K 512K 512K NONE 40MB 2M 2M 2M 2M 512K 512K 512K 512K 40MB 2M 2M 2M 2M 1M 1M NONE NONE 40MB 2M 2M 2M 2M 2M NONE NONE NONE 44MB 2M 2M 2M 2M 1M 1M 1M NONE 48MB 2M 2M 2M 2M 1M 1M 1M 1M 48MB 2M 2M 2M 2M 2M 2M NONE NONE 48MB 2M 2M 2M 2M 4M NONE NONE NONE 48MB 4M 4M 4M NONE NONE NONE NONE NONE 56MB 2M 2M 2M 2M 2M 2M 2M NONE 64MB 2M 2M 2M 2M 2M 2M 2M 2M 64MB 2M 2M 2M 2M 4M 4M NONE NONE 64MB 2M 2M 2M 2M 8M NONE NONE NONE 64MB 4M 4M 4M 4M NONE NONE NONE NONE 64MB 8M 8M NONE NONE NONE NONE NONE NONE 65MB 4M 4M 4M 4M 256K NONE NONE NONE 66MB 4M 4M 4M 4M 256K 256K NONE NONE 66MB 4M 4M 4M 4M 512K NONE NONE NONE 67MB 4M 4M 4M 4M 256K 256K 256K NONE 68MB 4M 4M 4M 4M 256K 256K 256K 256K 68MB 4M 4M 4M 4M 512K 512K NONE NONE 68MB 4M 4M 4M 4M 1M NONE NONE NONE 70MB 4M 4M 4M 4M 512K 512K 512K NONE 72MB 4M 4M 4M 4M 512K 512K 512K 512K 72MB 4M 4M 4M 4M 1M 1M NONE NONE 72MB 4M 4M 4M 4M 2M NONE NONE NONE DRAM CONFIGURATION (CONTINUED) Size Bank0 Bank1 Bank2 Bank3 Bank4 Bank5 Bank6 Bank7 80MB 4M 4M 4M 4M 2M 2M NONE NONE 80MB 4M 4M 4M 4M 4M NONE NONE NONE 88MB 4M 4M 4M 4M 2M 2M 2M NONE 96MB 4M 4M 4M 4M 4M 4M NONE NONE 96MB 4M 4M 4M 4M 8M NONE NONE NONE 96MB 4M 4M 4M 4M 2M 2M 2M 2M 96MB 8M 8M 8M NONE NONE NONE NONE NONE 128MB 8M 8M 8M 8M NONE NONE NONE NONE 128MB 4M 4M 4M 4M 8M 8M NONE NONE 129MB 8M 8M 8M 8M 256K NONE NONE NONE 130MB 8M 8M 8M 8M 256K 256K NONE NONE 130MB 8M 8M 8M 8M 512K NONE NONE NONE 131MB 8M 8M 8M 8M 256K 256K 256K NONE 132MB 8M 8M 8M 8M 256K 256K 256K 256K 132MB 8M 8M 8M 8M 512K 512K NONE NONE 132MB 8M 8M 8M 8M 1M NONE NONE NONE 134MB 8M 8M 8M 8M 512K 512K 512K NONE 136MB 8M 8M 8M 8M 512K 512K 512K 512K 136MB 8M 8M 8M 8M 1M 1M NONE NONE 136MB 8M 8M 8M 8M 2M NONE NONE NONE 140MB 8M 8M 8M 8M 1M 1M 1M NONE 144MB 8M 8M 8M 8M 1M 1M 1M 1M 144MB 8M 8M 8M 8M 2M 2M NONE NONE 144MB 8M 8M 8M 8M 4M NONE NONE NONE 152MB 8M 8M 8M 8M 2M 2M 2M NONE 160MB 8M 8M 8M 8M 2M 2M 2M 2M 160MB 8M 8M 8M 8M 4M 4M NONE NONE 160MB 8M 8M 8M 8M 8M NONE NONE NONE 176MB 8M 8M 8M 8M 4M 4M 4M NONE 192MB 8M 8M 8M 8M 4M 4M 4M 4M 192MB 8M 8M 8M 8M 8M 8M NONE NONE 224MB 8M 8M 8M 8M 8M 8M 8M NONE 256MB 8M 8M 8M 8M 8M 8M 8M 8M Note: The 512K x 36, 2M x 36, and 8M x 36 SIMMs are double-sided SIMMs. FLOPPY DRIVE 0 CONFIGURATION A: JA-1/pins 2 & 4 3.5" Closed 5.25" Open FLOPPY DRIVE 1 CONFIGURATION B: JA-1/pins 1 & 3 3.5" Closed 5.25" Open FLOPPY DRIVE POWER CONFIGURATION Drive Type RP3 Normal 3.5" 150 W Low power 3.5" 1K W IDE INTERFACE I/O READY SIGNAL CONFIGURATION IORDY JA-2/pins 2, 4, & 6 At pin 21 of IDE interface pins 2 & 4 closed At pin 27 of IDE interface pins 4 & 6 closed Note:If the hard drive has the IORDY signal at at both pins then either configuration will work. IDE INTERFACE DMA CONFIGURATION DMA JA-2/pins 1 & 2 JA-2/pins 3 & 5 JA-6 & JA-16 DMA6 Closed Closed pins 1 & 2 closed Disabled Open Open pins 2 & 3 closed Note:If the drive supports DMA then the IORDY signal must be at pin 27 of the IDE interface. WATCHDOG TIMER CONFIGURATION Timeout Minimum Timeout Typical Timeout Maximum JA-3 50ms 150ms 250ms pins 1 & 2 closed 250ms 600ms 1000ms Open 400ms 1200ms 2000ms pins 2 & 3 closed [Image] CONNECTIONS Purpose Location CPU cooling fan power +12VDC P1 Optional secondary cache module (64K or 128K) U7 Note:All DRAM banks must be populated on the motherboard before any cache modules can be installed. USER CONFIGURABLE SETTINGS Function Jumper Position » Flash memory normal operation at JA-1 pins 2 & 3 closed address A16 Flash memory inverted operation JA-1 pins 1 & 2 open at address A16 » Flash BIOS write protect enabled JA-2 pins 1 & 3, 2 & 4 closed Flash BIOS write protect JA-2 pins 1 & 3, 2 & 4 disabled open CPU TYPE CONFIGURATION Type Speed JA-3 JA-4 80486SX 33MHz pins 1 & 2 pins 2 & 4 closed closed 80486DX/DX2 33/66i MHz pins 1 & 2 pins 1 & 2, 3 & 4 closed closed ODPR486DX 33MHz pins 1 & 2 pins 1 & 2, 3 & 4 closed closed ODP486DX 33MHz pins 2 & 3 pins 1 & 2, 3 & 4 closed closed Note:ODPR486DX is pin compatible with the 80486DX/80486DX2 processors.