1. All in one architecture with single VESA capable riser card with 1 VESA and 4 ISA I/O connectors.
2. ZIF socket for overdrive processor located between front edge of PCB and PQFP surface mount location..
3. 8 DIP sockets for VRAM upgrade located to the left of the riser card slot.
** The later Plus version of this PCB only has 2 VRAM sockets **
4. 10 Cache DIP sockets on the right front corner of the MB when looking from the front of the PC.
5. 4 x 72 SIMM sockets located on front left corner of PCB.
6. Integral onboard I/O controller with, 2 ser, 1 prl, FDD, IDE. VGA
7. SW2 4 pos'n DIP switch located along the left edge of the PCB
8. SW1 4 pos'n DIP switch located just above the cache DIP locations on the right side of PCB.
- LPX form factor system board, Baby AT footprint 8.5" x 13".
· 64/128/256KB L2 external cache capable.
- One VL slot built onto the system board. Slot will accommodate riser card which supports up to one VESA and four ISA peripheral cards.
· On-board VESA Local bus video adapter, using the ATI 68800 Mach32 LX graphics accelerator with 1MB of VRAM (2MB optional).
·· On-board feature connectors accept:
· On-board Local bus IDE controller.
· Floppy controller (supports 2.88MB, 1.44MB, 1.2MB, 720K, and 360K floppy drive).
· Two high speed 16550 compatible serial ports.
· Bi-directional parallel port which is EPP and ECP compatible.
· Battery-backed real-time clock.
This MB has been certified for the DX-4 processors by Micronics.
No reports of POD or 5x86 upgrades to date.
Motherboard auto-selects CPU voltage requirement for 3.3V and 5V CPU chips.
There are no voltage select jumpers on this motherboard.
· Supports the following processors in the CPU ZIF socket:
· 486SX2, 50mhz
· 486DX, 33mhz
· 486DX2, 50 or 66mhz
· 486DX4, 75 or 100 Mhz
· Cyrix DX-2/80 or DX/40
· AMD DX/40, DX-2/80, or DX-4/100
- Pentium Overdrive
Micronics X30 single chip ASIC.
CMD 640A Local Bus IDE
SMC 605 Super I/O Controller
4 x 72 pin x 36 SIMM sockets accommodating up to 64MB.
This MB DOES NOT support "dual density" 8MB SIMM's.
ATI 68800 Mach32 LX, 1MB VRAM frame buffer (2MB optional)
Resolutions supported:
640 x 480, (65,536 colors)
800 x 600, (256 colors)
1024 x 768, (256 colors)
1280 x 1024 (W/2MB VRAM)
Standard PS/2 mini-din keyboard and mouse connectors
Phoenix BIOS on 1MB Flash EPROM
J1 Parallel port J2 Serial port 2 J3 Serial port 1 J7 Power LED & keylock J10 PS/2 mouse port J26 IDE connector J27 FDD connector J31 Video feature connector J32 VGA port W18 Turbo LED W19 Turbo switch W20 Reset switch W21 IDE activity LED SL1 32 bit VESA local bus slot
Disable onboard IDE ctrlr JP1 Closed RTC installed W1 Closed RTC not installed W1 Open Monitor type color W2 Closed Monitor type monochrome W2 Open IRQ12 PS/2 mouse enabled W3 Closed PS/2 mouse disabled W3 Open Parity enabled W4 Closed Parity disabled W4 Open CMOS normal operation W5 Open CMOS memory clear W5 Closed Super I/O enabled W7 Open Super I/O disabled W7 Closed Flash BIOS write protected W8 Open Flash BIOS write permitted W8 Closed PQFP not installed W13 Open PQFP disabled by OD processor W13 1&2 closed PQFP manually disabled W13 2&3 closed Factory config do no alter W15 1&2 closed Factory config do no alter W31 Open 80486SX CPU enabled W33 2&3 80486SX CPU disabled W33 1&2, 3&4 closed Factory config do no alter W36 Open VGA IRQ9 disabled W303 Open VGA IRQ9 enabled W303 Closed Factory config do no alter Sw1-3 Off Factory config do no alter Sw1-4 Off VPU chip disabled Sw2-1 On VPU chip enabled Sw2-1 Off Video RAMDAC at snooping mode Sw2-2 On Video RAMDAC at normal mode Sw2-2 Off VGA BIOS disabled Sw2-3 On VGA BIOS enabled Sw2-3 Off External speaker disabled Sw2-4 On External speaker enabled Sw4-4 Off
Size Bank 0 Bank 1 Bank 2 Bank3 1MB 256K x 36 2MB 256K x 36 256K x 36 4MB 1M x 36 6MB 256K x 36 256K x 36 1M x 36 8MB 1M x 36 1M x 36 10MB 256K x 36 256K x 36 1M x 36 1M x 36 12MB 1M x 36 1M x 36 1M x 36 16MB 1M x 36 1M x 36 1M x 36 1M x 36 16MB 4M x 36 18MB` 256K x 36 256K x 36 4M x 36 20MB 1M x 36 4M x 36 24MB 1M x 36 1M x36 4M x 36 32MB 4M x 36 4M x 36 40MB 1M x 36 1M x 36 4M x 36 4M x 36 48MB 4M x 36 4M x 36 4M x 36 64MB 4M x 36 4M x 36 4M x 36 4M x 36
Size Bank0 Bank1 Tag 64KB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8 128KB (4) 32K x 8 (1) 32K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8
Size W10 W11 W16 W17 W22 W23 W24 64KB 1&2 1&2 1&2 1&2 2&3 2&3 1&2 128KB 1&2 2&3 1&2 2&3 1&2 1&2 2&3 256KB 2&3 2&3 2&3 2&3 2&3 2&3 2&3
Type W33 All other CPU's 1&2, 3&4 closed 80486SX 2&3 closed 60486SX2 3&4 closed
804DX4 W32 W34 Disabled Open Open Enabled 1&2 3&4
Speed Sw1-1 Sw1-2 25Mhz Off On 33Mhz On On 50iMhz Off On 66iMhz On On 75iMhz Off On 100iMhz On On
DMA Channel W98 W99 Channel 1 1&2 1&2 Channel 2 2&3 2&3
Size Bank 0 Bank1 1MB (2) 512K x 8 None 2MB (2) 512K x 8 (8) 256K x 4