Reflect x-axis (mirror screen) on Linux tty without GUI and without xrandr -x

I want to run old computers without GUI. If I use the command xrandr -x in a Linux system (with GUI), the whole screen is reflected (mirrored) around the Y-axis (*along* the X-axis).  So text is mirror-text, like: pod       changes to                          boq and LED/6       changes to (something like)                     ∂ \\⫏∃⌋ (but by actually reflecting the characters, not substituting similar-looking ones). Even the layout is reflected like a mirror would be on the right or left side of the display, and you would watch into the mirror.  I use my computer this way, so also reading not from left to right.  I read text inverted from right to left.  The letters are each themselves mirrored. Without graphical user interface, I can't use xrandr -x.  So I am searching for a command that inverts the whole screen to x-axis timeless in the tty, so I can read text and use commands mirrored.  Text always starts from the right side of the screen.  It is like Arabic is written, but with Latin/Roman letters and other characters normally displayable in the console/terminal.