splash image is broken when booted from a USB rescue stick

[Hiroki Horiuchi]

Hello.

I have created a PLD rescue USB stick according to the procedure:
http://readme.maven.pl/2007/11/03/booting-plddos-from-usb-pendrive/

It first shows a broken logo with misaligned texts.
The boot itself can be done without a problem.

I can see the right splash when booted from rescue CDROM.
Or I can preview it on a UTF-8 capable terminal as follows:

$ iconv -f cp437 boot.msg

I tried both VMware Fusion and VirtualBox on El Capitan.
Same broken splashes in both cases.

What is wrong?

Thank you.
--
Hiroki Horiuchi from Japan