How can I change the text character size in text mode (runlevel 3)?

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The solution to using smaller fonts is to use the kernel framebuffer to set the console to a higher resolution.

To use the framebuffer, modify the kernel line in the /boot/grub/grub.conf file by appending vga=xxx where xxx is an integer or hex value.

For example:

    Title Red Hat Enterprise Linux 3
        root (...

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