Commodore COLT 286 Service Manual page 9

COLT 286 SERVICE MANUAL
values are underlined:
Note that the 6 MHz Hard Disk I/O value is normally disabled to allow for the fastest possible data transfer to and
from the hard disk. You should not have to change this setting unless you are using a hard disk that cannot support
high speed data transfer.
You can use the secondary Setup window to enable or disable the on board mouse and to select the serial port (COM)
and the parallel port (LPT).
SETTING THE MICROPROCESSOR CLOCK SPEED
The 80286 microprocessor in the COLT 286 is capable of running at three different clock (i.e., processor or CPU) speeds:
© Standard speed = 6 Mhz
© Turbo speed 8 Mhz
¢ Double speed = 12 Mhz
Unless you have changed the Default System Speed item in the secondary Setup window, the COLT 286 is pre-set to
run to double speed (12 MHz) whenever it is booted. You can switch between the clock speeds during a session by
using special key combinations or by using the ATSPEED command. (NOTE: If you reboot the COLT 286, the system
speed will revert to the default speed specified in the Setup utility. You can reset the default speed by using Ctrl-Alt-
Esc to access the Setup utility and then using F1 to call up the secondary Setup window.)
Note: Some software may require that you select standard or turbo speeds for normal operation.
To set the clock speed using the ATSPEED command, first make sure the MS-DOS prompt is showing on the screen.
Then type the word ATSPEED, followed by a space, a dash (—), and then a letter (S, T or D) denoting the desired
ATSPEED —T
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