Magma PCIHIF68 Bedienungsanleitung PDF herunterladen (Seite 10)

Media 100 Legacy Compatible Peripherals Guide

Ultra SCSI and Older 3-slot Systems

Ultra SCSI will not work on older 3-slot PCI machines (7500, 7600, 7300, 8500, and 8600) with

Media 100; bad video frame errors may occur. This does not apply to the Apple Power Macintosh

G3 machines.

To prevent bad video frame errors, slow down the synchronous transfer rate of Ultra SCSI by using

one of the procedures in “Slowing Synchronous Transfer Rates” on page 8. By slowing down the

transfer rate to 20 MB/second, you can still achieve data rates up to 300 KB/frame.

SSA and Fibre Channel controller cards will also have problems in an older 3-slot PCI machine

with P6000/Vincent. This is not the case with the Apple Power Macintosh G3 machines.

RAM Issues

There are issues concerning RAM in the Power Macintosh systems. It is important that the

DIMMs you use are identical. Verify that the RAM is the same speed, and that the refresh rate on

the RAM is the same for all DIMMs. Multi-Processor CPUs are especially susceptible to inferior

or mismatched RAM. If there are differences, you may experience intermittent problems such as

system crashes and lock-ups. The RAM will also not interleave, which is critical for video

playback.

This does not apply to the Apple Power Macintosh G3 machines since these machines use a

different type of RAM that does not require interleaving. The G3 requires PC-100 compliant

168–pin 3.3 volt unbuffered 8 byte (non-parity) SDRAM DIMMS.

RAM Recommendations

Macintosh Model Type of RAM Speed

Power Macintosh 7200, 7300, 7500,

7600, 8500, 8600, 9500, 9600

64 Bit wide 5 volt 168 pin fast paged mode 70 ns

Beige G3 64 Bit JEDEC standard 3.3 volt unbuffered

SDRAM

10 ns

Blue and White G3 64 Bit PC-100 synchronous 3.3 volt

unbuffered

8 ns

G3 Powerbook SDRAM special 1.5 wide card 10 ns

G4 64 Bit wide, 168 pin, running at 100 MHz,

PC-100, SDRAM, 3.3 volt, unbuffered

8 ns

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Magma PCIHIF68 Bedienungsanleitung Seite 10