How to use Caetla 0.34 with Xplorer
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Get it only from the official KCOMM site:
http://www3.airnet.ne.jp/kcomm/cae/caetlae.html
Grab the HTML pages linked here for offline reading.
Set Portaddress, usually SETPORT=10
Make a backup of your old ROM: CAEFLASH -XT -b BACKUP.ROM
Send CAETLA to your Xplorer: CAEFLASH -XT CAETLA.BIN
Set english language with SEL + L2, LEFT, CIRCLE
Set PAL videomode with SEL + L1, LEFT, CIRCLE
Set Configuration/Hardware Setting = Xplorer
Dump the ROM with CAEFLASH -b CAETLA34.PEX
(The suffix PEX should remind you of PAL/English/Xplorer)
Open CAETLA34.PEX with HexWorks from http://www.bpsoft.com
Select Block 0x0 - 0x1bfff and copy to clipboard
If you also use CAETLA cheats select 0x0 - 0x1ffff
Create new file and paste from clipboard
Save it as CAETLA34.PEX and you have a preconfigured ROM file
Restore your old FCD ROM: CAEFLASH BACKUP.ROM
Next time just use: CAEFLASH -XT CAETLA34.PEX

Here are the switches:
Videomode 1bf84 0=NTSC, 1=PAL
Language  1bf97 0=Japanese, 1=English

A little command dictionary:

CAETLA       EZORAY       SIOCONS          XLINK

psexe * -d#  ez load * #  local dload * #  xlink u * #  (* = PIC.TIM, #=8XXXXXXX)
psexe +      ez run +     local load +     xlink x +    (+ = START.EXE)

Usually you have to load first the Yaroze Library LIBPS.EXE, which is 399360 Bytes long.
It can be found on several PSX magazine CD-ROM.