ATI Adapters README file : XF86Config specifications : Clocks
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## 5.2. Clocks

For the purpose of specifying a clock line in your XF86Config, one of four different situations can occur, as follows.

Those configuring the driver's generic VGA support for a non-ATI adapter, can skip ahead to the "Clocks for non-ATI adapters" section below. Those not trying to configure the driver for a Mach64 adapter, can skip ahead to the "Clocks for fixed clock generators on ATI adapters" section below.

The very earliest Mach64 adapters use fixed (i.e. non-programmable) clock generators. Very few of these (mostly prototypes) are known to exist, but if you have one of these, you can also skip ahead to the "Clocks for fixed clock generators on ATI adapters" section below.

The two cases that are left deal with programmable clock generators, which are used on the great majority of Mach64 adapters.

If you are uncertain which situation applies to your adapter, you can run a clock probe with the command "X -probeonly".

### 5.2.1. Clocks for supported programmable clock generators

### 5.2.2. Clocks for unsupported programmable clock generators

### 5.2.3. Clocks for fixed clock generators on ATI adapters

### 5.2.4. Clocks for non-ATI adapters

ATI Adapters README file : XF86Config specifications : Clocks
Previous: ChipSet "name"
Next: Clocks for supported programmable clock generators