Specifications

Little Board/486i Technical Manual
3–40
I/O Address Function
3F8h - 3FFh Primary serial port
3F2h - 3F7h Floppy disk controller ports
3F2: FDC Digital output register
3F4: FDC Main status register
3F5: FDC Data register
3F7: FDC Control register
3F0h - 3F1h Ampro reserved
3E8h - 3EFh Third serial port
3D0h - 3DFh Video controller
3C0h - 3CFh Flat Panel/CRT VGA display adapter
3B0h - 3BFh Monochrome display adapter
378h - 37Fh Primary parallel printer port
340h - 35Fh SCSI interface (0140H-015Fh if W24
installed)
320h - 32Fh Ethernet interface (default)
2F8h - 2FFh Secondary serial port
2F0h - 2F3h Ampro reserved
2E8h - 2EFh Fourth serial port
278h - 27Fh Secondary parallel printer port
1F8h - 1FFh Ampro reserved
1F0h - 1F7h IDE hard disk interface
0F0h - 0FFh Reserved
0C0h - 0DFh DMA controller 2 (8237 equivalent)
0A0h - 0A1h Interrupt controller 2 (8359 equivalent)
092h Fast A20 gate and CPU reset
080h - 08Fh DMA page registers (74LS61 equivalent)
070h - 071h Real-time clock and NMI mask
060h, 064h Keyboard controller (8042 equivalent)
040h - 043h Programmable timer (8254 equivalent)
020h - 021h Interrupt controller 1 (8359 equivalent)
000h - 00Fh DMA controller 1 (8237 equivalent)
E0E0h - E0EFh Ethernet disable address (full 16-bit
address)
Table 3-15 Little Board/486i I/O Map