Specifications

080505 OPERATIONS MANUAL PPM-GX500 35
Following is a list of PC I/O ports. I/O addresses marked with ‘**’ are generally unused and
should be the basis for the rst choices in I/O address selection for external I/O boards.
NOTE : The PPM-GX500 uses a PnP BIOS resource allocation. Care must be taken to avoid
contention with resources allocated by the BIOS.
Hex Range Usage
000-00F 8237DMA Controller #1
**010-01F Free
020-021 8259 PIC #1
**022-03F Free
040-043 8254 PIT
**044-05F Free
060-06F 8042 Keyboard / Mouse Controller
070-07F CMOS RAM, Clock / Calendar
080-09F DMA Page Registers
0A0-0BF 8259 PIC #2
0C0-0DF 8237 DMA Controller #2
**0E0-0EF Free
0F0-0F1 Math Co-processor Control
**0F2-0F7 Free
0F8-0FF Math Co-processor
100-102 Video Controllers
**103-11F Free
120-127 Free
**128-1EA Free
1E8-1EB Reserved for on-board conguration
1EC Interrupt Status
1ED Status LED
1EE-1EF Watchdog Timer Control
1F0-1FF IDE Controller #1
**200-277 Free
**278-27F Free (Option for LPT)
**280-2A7 Free
**2A8-2AF Free (Option for on-board serial ports)
2B0-2DF Video Controllers
**2E0-2E7 Free
2E8-2EF COM4 – (Default)
**2F0-2F7 Free
2F8-2FF COM2 – (Default)
**300-377 Free
378-37B LPT (Default)
**37C- 3A7 Free
**3A8- 3AF Free (Option for on-board serial ports)
3B0-3BB Video Controllers
**3BC-3BF Free (Option for LPT)
3C0-3DF Video Controllers
**3E0-3E7 Free
3E8- 3EF COM3 – (Default)
3F0-3F7 Floppy Disk Controller #1
3F8-3FF COM1 – (Default)
I/O Port Map