IBM 8514 / Multisync CRT
A: FREEDOS_13.IMG
C: MSDOS_C_250MB.IMG
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Quick Keys & DOS Commands:
ASUS / OPTi-495SX SOCKET 3 VLB/ISA MOTHERBOARD REV 2.4
Intel i486™
DX2-66 MHz
SOCKET 3 PGA-168
FPU INTEGRATED
72-PIN FPM SIMM RAM BANKS (16 MB TOTAL)
SIMM BANK 0: 4MB 60ns
SIMM BANK 1: 4MB 60ns
SIMM BANK 2: 4MB 60ns
SIMM BANK 3: 4MB 60ns
AMI / SeaBIOS ROM
128KB @ 0xE0000
128KB @ 0xE0000
OPTi 82C495XLC
VLB/ISA Northbridge
VLB/ISA Northbridge
DALLAS DS12887
Real-Time Clock CMOS
Real-Time Clock CMOS
PORT 80h POST:
FF
EXPANSION BUS SLOTS (CLICK ANY SLOT TO INSPECT, RECONFIGURE JUMPERS, OR SWAP CARDS)
LIVE BUS
ISA / VLB Bus Telemetry
ADDR: 0x000B8000
I/O PORT: 0x0080
Control Strobe Lines:
MEMR#
MEMW#
IOR#
IOW#
BCLK 8MHz
8259 PIC Hardware Interrupt Lines (IRQ 0 - 15):
IRQ0 (PIT)
IRQ1 (KBD)
IRQ5 (SB16)
IRQ6 (FDD)
IRQ8 (RTC)
IRQ9 (NE2000)
IRQ10
IRQ12 (PS/2)
IRQ14 (IDE1)
IRQ15 (IDE2)
💾 Front Panel Drive Bays (Mount, Eject & Export Media)
DRIVE A: 3.5" HD Microfloppy (1.44 MB)
FREEDOS_13.IMG
DRIVE B: 5.25" High-Density Floppy (1.2 MB)
[Empty / Ejected]
DRIVE E: Creative 4X Quad-Speed CD-ROM (ATAPI IDE)
COMPACT DISC DIGITAL DATA
[No Disc]
DRIVE C: Western Digital Caviar IDE Hard Disk (Primary Master)
MSDOS_C_250MB.IMG (250 MB)
DISK LIBRARY
1-Click Bundled & Cached Disks
Select any floppy image to mount into A: or B: (cached automatically in browser storage):
DISK GENERATOR
Create Blank Formatted Media
Generate fresh FAT12 floppy disks or partitioned FAT16 hard drive images right in your browser:
CARD SDK
Modular ISA / VLB Adapter Card Builder
Ready to build.
TEST BENCH
Interactive I/O Port & LED Test Harness
Test your custom card's I/O port reads, writes, and visual LED indicators directly on the bench before or after plugging it into the motherboard:
Bench ready. Click IN or OUT to probe your card.
Card Bracket LEDs & Logic States:
💡 Adapter Card API Quick Reference:
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getIOPortHandlers(): Return [{ port, read(addr), write(addr, val) }]•
getMemoryWindows(): Return [{ start, end, read(addr), write(addr, val) }]•
this.bus.raiseIRQ(n) / this.bus.lowerIRQ(n): Trigger hardware interrupt•
tick(cycles): Runs synchronized with CPU instruction clock
80486DX2 CORE
Speed: 15.00 MIPS
Executed: 0 inst
REGISTERS
Intel 80486 32-Bit General, Segment & Control Registers
EAX 00000400
EBX 00000000
ECX 00000000
EDX 00000000
ESI 00000000
EDI 00000000
ESP 00007C00
EBP 00000000
EIP 00007C00
EFLAGS 00000002
CS 0000
DS 0000
SS 0000
ES 0000
MEMORY BUS