My advice is generic although I run Mepis but am not fully aware of its features.
If you don't like the resolution of a Live CD you can change it by the following ways
(1) In the desktop (video driver may have been fixed) alter the resolution and scanning frequencies of the monitor. The scope of change is limited if the video driver has been mismatched.
(2) press ctrl+alt+backspace to drop back into th terminal mode. Most recent distros has a Xwindow configurator called "xorgconfig". You can invoke it by just typing the name and be able to configure the mouse, keyboard, video card, resolution and scanning frequencies. When you save the file, which is called /etc/X11/xorg.conf, you can return back to the desktop by issuing the command "startx". You can repeat the process as many times as you want untill everything is ideal.
(3) You can edit the file /etc/X11/xorg.conf to amend the configuration settings directly. This is the quickest but you do need to know the video driver name, scanning frequencies etc.
---------------------------------------
On booting via a floppy this is your God given right in Linux. The problem is to know how to achieve it.
This is how
(a) When you install Mepis make sure you instruct the installer to put the boot loader in the root partition and
not the MBR. When the installation completes Mepis will not boot yet.
(b) You then reboot using the same Live CD to get the Live CD version of Mepis in the memory. I believe Mepis always uses Grub but if your copy doesn't then follow the Task B3 of
this thread and use "fd0" instead of "hda" as the destination. If your Mepis uses Grub then you can get a bootable floppy of Mepis by the following commands at the terminal after boot up to the Mepis Live CD, I assume the root partition of your installed Mepis is hda3 which will be known as (hd0,2) to Grub as Grub counts from 0, adjust it according to suit your circumstance
Code:
grub
root (hd0,2)
setup (fd0)
quit
reboot
Basically you invoke a Grub shell with the boot up Mepis, tell Grub the root of the Linux you are interested is in the 3rd partition of the 1st disk and command Grub to install itself the the device "fd0". After that you exit Grub and tell the boot up Mepis to reboot. The floppy in the drive will boot up Mepis from now on. There is no need to pre-format the floppy too.
Good luck