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Maintenance
& Service Guide
|
MSG Index | Product Description | Troubleshooting | Illustrated Parts |
Home | Removal & Replacement | Jumpers & Switches | Specifications |
Compaq Presario 7900 Series Personal Computer specifications are listed in the following tables. Select the specification you are interested in from the navigation bar.
Specifications |
System Specifications |
Video Memory |
System Interrupts |
System I/O |
System Memory |
System DMA |
Power Supply |
Diskette Drive |
DVD Drive |
IDE Hard Drives |
Mouse |
Fax/Modem |
CD-RW Drive |
System Memory |
|||
Size | Low Address | High Address | System Function |
640 KB | 00000000 | 0009FFFF | Base Memory |
128 KB | 000A0000 | 000BFFFF | Video RAM |
32 KB | 000C0000 | 000C7FFF | Video ROM |
32 KB | 000C8000 | 000CFFFF | unused |
64 KB | 000D0000 | 000DFFFF | unused |
48 KB | 000E0000 | 000EBFFF | unused Not available for option cards Can use for UMBs |
16 KB | 000EC000 | 000EFFFF | 16-bit cacheable,
shadowable, read only memory Not available for option cards |
64 KB | 000F0000 | 000FFFFF | System BIOS ROM shadow image |
15 MB | 00100000 | 00FFFFFF | Standard Extended Memory |
64 MB | 01000000 | 04FFFFFF | Rest of Extended Memory |
60 MB | 05000000 | 07FFFFFF | unused |
512 KB | 08000000 | 0807FFFF | Standard Direct Video Memory |
512 KB | 08080000 | 080FFFFF | Optional Direct Video Memory |
1919 MB | 08100000 | 7FFFFFFF | unused |
16 M | 80000000 | 80FFFFFF | Memory mapped I/O devices |
~2000 MB | 81000000 | FDFDFFFF | unused/System ROM aliases |
128 KB | FDFE0000 | FDFFFFFF | System ROM (alias) |
~32 MB | FE000000 | FFFDFFFF | unused |
128 KB | FFFE0000 | FFFFFFFF | System BIOS ROM |
System DMA |
|||
Default DMA |
ISA Bus Pin |
Function |
Alternative Mapping |
DMA0 |
ECP Printer Port (LPT1) | ||
DMA1 |
Available | ||
DMA2 |
Standard Floppy Disk Controller | ||
DMA3 |
Available | ||
DMA4 |
Direct Memory Access Controller | ||
DMA5 |
Available | ||
DMA6 |
Available | ||
DMA7 |
Available |
U. S. | Outside U. S. | ||
Input Specifications | |||
Voltage Switch Setting | 115 V | 230 V | |
Nominal Line Voltage | 115 VAC | 230 VAC | |
Range Input Line | 90 to 132 VAC | 180 to 264 VAC | |
Frequency Range | 47 to 63 Hz | 47 to 63 Hz | |
Power Factor | 0.55 | 0.55 | |
Input Power | 310 Watts | 310 Watts | |
Input Current | 6 at 90 VAC | 3 at 180 VAC | |
Inrush Current | 65 A at 115 VAC (cold start) |
65 A at 230
VAC (cold start) |
|
Holdup Time | 16 ms from zero crossing at 120 VAC | 16 ms from zero crossing at 240 VAC | |
Steady State | 200 Watts | 200 Watts | |
General Specifications | |||
Full Output Rating | To 122°F and 5,000
ft To 90°F and 10,000 ft (derate linearly) |
To 50°C and 1524 m To 32°C and 3048 m (derate linearly) |
|
Minimum Load | 1.4 A on + 5.0 V output;
0.07 A on 12 V output |
1.4 A on +
5.0 V output; 0.07 A on 12 V output |
|
Ambient Temperature Range | |||
Operating | 50° to 122° F | 10° to 50° C | |
Storage | -40° to 151° F | -40° to 66° C | |
Dielectric Voltage Withstand | |||
Input to Ground | 1500 VAC/1 second | ||
Safety Standard | UL 1950; CSA 22.2 950; TUV/VDE EN 60 950 (VDE0805/11.91); EMKO-TSE (74-SEC) 207/94 | ||
Input Transient Susceptibility | |||
Common and Differential
Mode (superimposed on AC line) |
2500 V, 1
us, damped sinusoid 600 V, 10 us pulse |
||
Differential Mode | 20% step change in AC input voltage |
Diskette Drive |
|
Diskettes | |
Size (in) | 3.5 (8.89 cm) |
High Density (MB) | 1.44 |
Low Density (KB) | 720 |
Light | Green |
Height | One-third |
Bytes per Sector | 512 |
Sectors per Track | |
High Density | 18 |
Low Density | 9 |
Tracks per Side | |
High Density | 80 |
Low Density | 80 |
Read/Write Heads | 2 |
Average Seek Time (ms) | |
Track-to-Track | 3 |
Average | 94 |
Settling Time | 15 |
Latency Average | 100 |
CD/DVD Drive |
||
Dimensions | U. S. |
Metric |
|
5.74 in 1.68 in 8.23 in |
14.60 cm 4.29 cm 20.80 cm |
Weight | 1.80 lb | 0.9 kg |
Applicable Disc Formats | ||
|
Mode 1 and Mode 2 Audio Mode 2, Form 1 and 2 Single and Multiple Session |
|
Block Size | ||
|
2352 bytes 2352, 2340,2336, 2048 bytes 2352,2340, 2336, 2048 bytes 2048 bytes |
|
Center Hole | 15 mm diameter | |
Diameter | 12 cm, 8 cm | |
Thickness | 1.2 mm | |
Track Pitch | 0.74 µm (DVD) 1.6 µm (CD-ROM) | |
Laser | ||
|
53.5 degrees ± 1.5 degrees 5 mW Semiconductor laser GaAIAs 650 nm ± 25 nm (DVD) 795 nm ± 25 nm (CD) |
|
Access Time (Typical) | ||
|
DVD: < 180 ms < 300 ms |
CD: < 120 ms < 200 ms |
Audio Output Level | ||
|
1.0 V (RMS) at 47 kW 0.7 V (RMS) at 32 W |
|
Cache Buffer | 512 KB | |
Sustained
Data Transfer Rate |
150 KB/sec
(single, CD-ROM mode) 2100-4800 KB/sec (32× CAV CD-ROM mode) 4455-10800 KB/sec (8× CAV DVD mode) |
|
Interface Cable Length (Max) | 18 in | |
Startup Time | < 10 sec | |
Stop Time | < 3 sec |