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Maintenance and Service Guide Compaq Presario 4900, 5000, & 5100 Series Computers
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| SPECIFICATIONS System Specifications (continued) General system specifications Video memory System interrupts System I-O System memory System DMA
System I/O
I/O Address (Hex) | System Function (Shipping Configuration)
000 - 00F | DMA Controller # 1
010 - 01F | DMA controller aliases
020 | Interrupt Controller # 1 Control Register
021 | Interrupt Controller #1 Mask Register
022 - 03D | Inerrupt Controller Aliases
040 - 043 | Counter/Timer
044 - 04F | Unused
050-053 | Counter/Timer Aliases
053-05F | Unused
060 | Keyboard Controller Data Register
061 | Port B: SERR/IOCHK NMI, Speaker, Refresh
062 - 063 | Unused
064 | Keyboard Controller Command/Status Register
065 - 06F | Unused
070 | NMI mask register (bit 7)
070 | RTC/Configuration Memory Index Port (bit 6:0)
071 | RTC/Configuration Memory Data Port
072 | RTC Extended Index
073 | RTC Extended Data
074-07F | Unused
080 - 08F | DMA Page Registers
090 - 091 | Unused (alias of DMA page registers if PIIX4.4C.7=0)
092 | Port 92 (fast reset and A20 gate)
093 - 09F | Unused (alias of DMA page registers if PIIX4.4C.7=0)
0A0 | Interrupt Controller # 2 Control Register
0A1 | Interrupt Controller # 2 Mask Register
0A2 - 0B1 | Unused
0B2 | APM Control
0B3 | APM Status
0B4-0BF | Unused
0C0 - 0DF | DMA Controller # 2
0E2 - 0E3 | DDC2 Registers
0E4 - 0E5 | Master I2C Interface
0E7 - 0E9 | Unused
0EA | Ultra I/O Index Register
0EB | Ultra I/O Data Register
0EC- 0EF | Modem Configuration
0F0 - 0F1 | Coprocessor Busy Clear/Reset
0F2 - 0F8 | Unused
OFA | Unused
0FC-0FF | Unused
100 - 101 | Unused
102 | Video Controller: POS 102 Register
103-12F | Unused
132 - 16F | Unused
170 - 177 | Secondary IDE Controller (CD Drive)
178 - 1EF | Unused
1F0 - 1F7 | Primary IDE Controller (Hard Drive)
1F8 - 200 | Unused
201 | Joystick (Decode in ES 1869)
202 - 21F | Unused
220 - 22F | Entertainment Audio
230 - 25F | Unused
260 - 263 | Reserved - Modem use during POST
264 - 277 | Unused
278 - 27F | Reserved - Parallel Port (LPT 2)
280 - 2E7 | Unused
2E8 - 2EF | Reserved - Serial Port (COM 4)
2F0 - 2F7 | Unused
2F8 - 2FF | Modem (COM 2)
330 - 331 | MPU-401 (Decode in ES 1869)
332 - 36F | Unused
370 - 377 | Reserved - Diskette Drive Controller 2 (370-371 used for SIO lock/unlock)
378 - 37F | Parallel Port (LPT 1)
380 - 387 | Unused
388 - 38B | Audio FM Synthesizer - ES 1869
38C - 3B3 | Unused
3B4 - 3B5 | Video Controller: Monochrome
3B6 - 3B9 | Unused
3BA | Video Controller: Monochrome
3BB | Unused
3BC -3BF | Reserved - Parallel Port
3C0 -3CF | Video Controller: VGA Registers
3D0 - 3D3 | Unused
3D4 - 3D5 | Video Controller: Color
3D6 - 3D9 | Unused
3DA | Video Controller: Color
3DB - 3E7 | Unused
3E8 - 3EF | Reserved: Serial Port (COM 3)
3F0 - 3F7 | Diskette Controller (Primary)
3F6 - 3F7 | IDE Interface (Hard disk and CD or DVD Drive)
3F8 - 3FF | Serial Port (COM 1)
4D0 | Interrupt Controller 1 Edge/Level Control
4D1 | Interrupt Controller 2 Edge/Level Control
4D2 - 677 | Unused
678 - 67A | Parallel Port ECP Mode
778 - 77A | Parallel Port ECP Mode
CF8 | PCI Configuration Index (32 bit I/O only)
CF9 | Reset Control
CFC - CFF | PCI Configuration Data
46E8 | Video Controller: Adapter Sleep
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