EVEREX SYSTEMS, INC. STEP PLUS 486 (EV-18216) Processor 80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive Processor Speed 25/33/40/50(internal)/50/66(internal)MHz Chip Set Unidentified Max. Onboard 64MB DRAM Cache 64/128/256KB BIOS Unidentified Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interface, SCSI connector, parallel port, serial ports (2), VGA port, microphone port, LAN port, CD-ROM auxiliary in, riser slot NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location LAN port CN1 Power LED J4 Serial port 2 CN2 IDE interface LED J5 Parallel port CN3 Keylock J6 Microphone port CN4 Speaker J7 Speaker port CN5 IDE interface J9 Serial port 1 CN6 SCSI interface J10 Floppy drive interface CN7 CD-ROM auxiliary in J14 Speaker button J1 VGA port J15 Reset switch J2 Riser slot SL1 USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation JP5 Open CMOS memory clear JP5 Closed » On board VGA IRQ9 disabled JP8 Open On board VGA IRQ9 enabled JP8 Closed » IDE interface enabled JP9 Closed IDE interface disabled JP9 Open » SCSI IRQ select IRQ12 JP12 pins 2 & 3 closed SCSI IRQ select IRQ10 JP12 pins 1 & 2 closed » Parallel port IRQ select IRQ7 JP14 pins 1 & 2 closed Parallel port IRQ select IRQ5 JP14 pins 2 & 3 closed » Flash BIOS normal mode SW1 On Flash BIOS programming mode SW1 Off DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x NONE NONE NONE 36 2MB (1) 512K x NONE NONE NONE 36 3MB (1) 512K x (1) 256K x NONE NONE 36 36 4MB (1) 512K x (1) 512K x NONE NONE 36 36 4MB (1) 1M x 36 NONE NONE NONE 5MB (1) 512K x (1) 512K x (1) 256K x NONE 36 36 36 6MB (1) 512K x (1) 512K x (1) 512K x NONE 36 36 36 6MB (1) 512K x (1) 1M x 36 NONE NONE 36 7MB (1) 512K x (1) 512K x (1) 512K x (1) 256K x 36 36 36 36 8MB (1) 512K x (1) 512K x (1) 512K x (1) 512K x 36 36 36 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 8MB (1) 2M x 36 NONE NONE NONE 8MB (1) 512K x (1) 512K x (1) 1M x 36 NONE 36 36 10MB (1) 512K x (1) 2M x 36 NONE NONE 36 10MB (1) 512K x (1) 1M x 36 (1) 1M x 36 NONE 36 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 NONE 12MB (1) 1M x 36 (1) 2M x 36 NONE NONE 12MB (1) 512K x (1) 512K x (1) 2M x 36 NONE 36 36 12MB (1) 512K x (1) 512K x (1) 2M x 36 NONE 36 36 14MB (1) 512K x (1) 1M x 36 (1) 2M x 36 NONE 36 16MB (1) 2M x 36 (1) 2M x 36 NONE NONE 16MB (1) 1M x 36 (1) 1M x 36 (1) 2M x 36 NONE 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 16MB (1) 4M x 36 NONE NONE NONE 18MB (1) 512K x (1) 2M x 36 (1) 2M x 36 NONE 36 20MB (1) 1M x 36 (1) 4M x 36 NONE (1) 2M x 36 20MB (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 NONE DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 20MB (1) 1M x 36 (1) 1M x 36 (1) 2M x 36 (1) 1M x 36 24MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 NONE 26MB (1) 512K x (1) 2M x 36 (1) 2M x 36 NONE 36 28MB (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 32MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 32MB (1) 2M x 36 (1) 2M x 36 (1) 4M x 36 NONE 32MB (1) 4M x 36 (1) 4M x 36 NONE NONE 40MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 48MB (1) 2M x 36 (1) 2M x 36 (1) 4M x 36 (1) 4M x 36 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 NONE 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 (1) 32K x 8 128KB (4) 32K x 8 NONE (1) 32K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP3 JP4 64KB pins 3 & 5, 4 & 6 Open closed 128KB pins 3 & 5, 4 & 6 pins 1 & 3, 2 & 4 closed closed 256KB pins 1 & 3, 2 & 4 pins 1 & 2, 3 & 4, 5 & closed 6 closed CPU TYPE CONFIGURATION Type JP10 80486SX pins 1 & 3, 2 & 4, 8 & 9 closed 80487SX pins 3 & 5 closed 80486DX pins 1 & 3, 4 & 6, 8 & 9 closed 80486DX2 pins 1 & 3, 4 & 6, 8 & 9 closed Pentium Overdrive pins 1 & 3, 2 & 4, 7 & 8, 9 & 10 closed CPU SPEED CONFIGURATION Speed JP7 25MHz pins 1 & 2, 3 & 4 closed 33MHz pins 3 & 4 closed 40MHz pins 1 & 2 closed 50iMHz pins 1 & 2, 3 & 4 closed 50MHz Open 66iMHz pins 3 & 4 closed VESA WAIT STATE CONFIGURATION Wait states JP6 0 wait states pins 4 & 6 closed 1 wait state pins 2 & 4 closed BUS SPEED CONFIGURATION CPU speed JP6 <= 33MHz pins 3 & 5 closed > 33MHz pins 1 & 3 closed VRAM CONFIGURATION Size Bank 0 Bank 1 512KB (8) 44256 NONE 1MB (8) 44256 (8) 44256 VESA VIDEO CONFIGURATION Setting JP17 Enabled pins 1 & 2 closed Disabled pins 2 & 3 closed VIDEO CONFIGURATION (86C08051 ONLY) Setting JP17 1NS pins 10 & 11, 13 & 14 closed 2NS pins 11 & 12, 13 & 14 closed 3NS pins 10 & 11, 14 & 15 closed 4NS pins 11 & 12, 14 & 15 closed VIDEO FREQUENCY CONFIGURATION Size JP17 43Hz pins 5 & 6, 8 & 9 closed 56Hz pins 4 & 5, 8 & 9 closed 60Hz pins 5 & 6, 8 & 9 closed 70Hz pins 4 & 5, 7 & 8 closed 72Hz pins 4 & 5, 7 & 8 closed LRDY DELAY CONFIGURATION Type JP1 JP2 None pins 5 & 6 closed Open 2 gate pins 3 & 4 closed Open 1 CLK pins 1 & 2 closed pins 2 & 3 closed 2 CLK pins 1 & 2 closed pins 1 & 2 closed IDE SPEED CONFIGURATION Speed JP11 0 pins 3 & 5, 4 & 6 closed 1 pins 1 & 3, 4 & 6 closed 2 pins 3 & 5, 2 & 4 closed 3 pins 1 & 3, 2 & 4 closed