Technical information

Cyrix 6x86 CPUs
Clock Chip: PLL52C61-01 or PLL52C61-21
Ext. Clock Factor Ext. Clock Freq.: Normal/Turbo ISA Spd Refresh
CPU:Ext/Int Clock DS1 DS2 DS3 DS4 DS7 DS5 DS6
P120+:50/100MHz OFF ON ON/— ON/— ON/— OFF OFF
P133+:55/110MHz OFF ON ON/— OFF/— ON/— ON OFF
P150+:60/120MHz OFF ON ON/OFF ON/OFF OFF/ON ON OFF
P166+:66/133MHz OFF ON OFF/OFF ON/OFF ON/OFF ON OFF
P200+:75/150MHz OFF ON ON/— OFF/— OFF/— ON OFF
Clock Chip: PLL52C59-14T or ICS9159-14
Ext. Clock Factor Ext. Clock Freq. — (Norm/Turbo) ISA Spd Refresh
CPU:Ext/Int Clock DS1 DS2 DS3 DS4 DS7 DS5 DS6
P120+:50/100MHz OFF ON ON ON OFF/ON OFF OFF
P133+:55/110MHz OFF ON OFF OFF OFF/— ON OFF
P150+:60/120MHz OFF ON OFF ON OFF/ON ON OFF
P166+:66/133MHz OFF ON ON OFF OFF/ON ON OFF
P200+:75/150MHz OFF ON OFF OFF ON/— ON OFF
Note:
ICS9159-14 does not support Turbo mode at 75MHz
ISA Spd. – ISA Bus Clock speed, see page 2-19
Refresh – DRAM refresh [reserved for future use] always OFF
DS8 – reserved for future use, always OFF