Tyan Computer GX21 - Manual (Page 81)

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Primary / Secondary Master/ Slave PIO
The four IDE PIO (Programmed Input / Output) fields let you
set a PIO mode (0-4) for each of the four IDE devices that the
onboard IDE interface supports. Modes 0 through 4 provide
successively increased performance. In Auto mode, the sys-
tem automatically determines the best mode for each device.
The choices are:
Auto / Mode 0 / Mode 1 / Mode 2 / Mode 3 /
Mode 4
Primary / Secondary Master/ Slave UDMA
This option allows you to select the mode of operation for the
Ultra DMA/33 implementation. This is possible only if your
IDE hard drive supports UDMA and the operating environ-
ment includes a DMA driver (Windows 95 OSR2 or a third-
party IDE bus master driver). UDMA (Ultra DMA) is advanced
technology that provides for even faster throughput, up to
33.3 MB/s in UDMA mode 2 and 66.7 MB/s in UDMA mode 4,
twice to four times that of EIDE, for much lower prices than
SCSI. Many new computers come with large UDMA drives
and UDMA interfaces, and it's possible to add a UDMA inter-
face card (such as the Promise Ultra33 or Ultra66) to an
existing system to boost speed, even on older non-UDMA
drives. If your hard drive and your system software both sup-
port Ultra DMA/33, select Auto to enable BIOS support. The
choices are:
Auto / Disabled
On-Chip Serial ATA
The integrated peripheral controller contains a S-ATA inter-
face with support for two S-ATA channels. Serial ATA is a
point-to-point connection and allows multiple ports to be
aggregated to a single controller typically located either on
the motherboard or an add-in RAID card. Through back-
planes and external enclosures, Serial ATA can be deployed
in high-capacity server and networked-storage environments.
Serial ATA technology can deliver 1.5 Gbps (150 MB/sec) to
each drive within a disk drive array. Select “Enabled” to acti-
vate each channel separately. The choices are:
Enhanced Mode / S-ATA Only