8     IBM Desktop System HMM
Hardware Interfaces
The following peripheral interfaces for adapters, 
options, and drives are supported in the system unit.
Item Interface
Expansion slot for 
I/O adapter cards
Three PCI (Peripheral Component 
Interconnect) v2.2 compatible 
expansion slots that operates at 33 
MHz bus speed.
Hard disk drives Four PCI local bus Enhanced IDE 
v1.0 compatible hard disk drive 
interfaces that support:
- PIO mode up to 6 mode
- DMA 32-bit access 
- Ultra 33/66 Synchronous DMA (33/
66M bytes/sec). 
DVD-ROM drive 5.25-in. high-performance, 8X/40X 
DVD-ROM  IDE/AT drive. 
Support Bootable CD-ROM Format 
specification version 1.0. 
Compliant to Audio-CD, Video-CD, 
CD-ROM/XA, Karaoke-CD, and 
Photo-CD (both single and multi
session) format.
Diskette drive  AT diskette interface
Video Physical interface is compatible with 
the IBM Personal System/2 (PS/2) 
VGA interface.
Support Accelerated Graphics Port 
(AGP) 
Modem One 56.6 Kbps PCI modem adapter 
card with data/fax/voice or non-voice 
features.
Audio  Compatible to AC99
Pointing device  IBM PS/2-compatible mouse
Keyboard device  IBM PS/2-compatible keyboard
Serial port Support one high speed NS 16C550 
compatible UARTs with send/receive 
16 bytes FIFOs
RS232D electrical interface 
compliant