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trv840 hidden feature hack

DCR-TRV840 NTSC

successful and permanent hidden features activation:

There is NO WARRANTY, expressed or implied, associated with this post

!!!!! Use at your own risk !!!!!

You can easily damage your camera, computer, mind, marriage, etc.

Do not blame me, you have been warned.

New features unlocked by hack:

DISPLAY of gain-shift / ae-shift / aperture, gain and shutter
ZEBRA
AE-SHIFT
COLOUR BAR /GAIN SHIFT
WHITE BALANCE
MIC LEVEL(not sure it works, but it does display)
DATE REC (not shown in the menus, maybe only for Hi8, but seems to be necesary for proper checksum calculation)

Below is a script for lancterm.exe that worked for me. (Find Lancterm here: http://download.usenet-replayer.com/L/H/3/5/6/0/1111920653.3.zip)

The checksum change that must be written to the eeprom is the reference to address AH 6FH (my new value is 3BH). The data here must match data at address 07H F0H, which is the camera's calculated checksum. My original value, before the mods, was 4EH, if yours is not, the value here is probably wrong for you. Please consider whether you want to proceed or not, as the checksum value 3BH will probably not work for you. I had a pretty good scare that I had permanently ruined my camera...

I was not able to find a checksum calculator for fourth generation D8 cams and I do not know the values needed to be XORed to come up with the magic number: I found mine (3BH) through reading the value at 07H F0H after receiving error E:20:00 (checksum mismatch) and managing to get a memory dump, not for the faint at heart. If your original value is 4EH, then this script should work for you - no guarantees - you could ruin your camera or at least make it unfixable by you - be warned.

Others with TRV740 models have had success with original checksum value C7H and new value 1BH: it may help you to peruse http://download.usenet-replayer.com/L/H/3/5/6/0/1111920653.2.doc, which is in Polish, but I managed to get the gist of it through a paragraph by paragraph translation through web based Polish translation. The 07 value mentioned at 07h F1H and at 0AH 6EH simply means that the DV-in function is activated (would be 04 otherwise), but it is still a calculated vaule. When I first tried this and omitted the DATE REC mod in the script, it calculated to 00.

here is the script:

log ON
;UNLOCK eeprom for writing
0H 01H 01H
;DISPLAY ae shift, gain, shutter, etc.
AH 21H B7H
STORE
;ZEBRA
AH 22H 60H
STORE
;AE-SHIFT
AH 23H E5H
STORE
;COLOR BAR and GAIN SHIFT
AH 25H A3H
STORE
;WHITE BALANCE
AH 2CH 76H
STORE
;MIC LEVEL
AH 2FH 7BH
STORE
;DATE REC
AH 49H 07H
STORE
;CHECKSUM
AH 6FH 3BH
STORE
;LOCK EEPROM for writing
0H 01H 00H
log OFF

Not for the faint at heart...

Johanes Wilhelm von Savoyen
Mon, 22 Oct 2007 02:14:28 +0000

I have old DCR-TRV840 NTSC camera which I did not use for maybe 2-3 years. These new features will make camera more attractive for use, so I will start to use it again. I would like to give it to try, but I need to know details. Do I need to disassemble camera? Do I need special equipment? How do I run this script? One more thing. These links (http://download.usenet-replayer.com/L/H/3/5/6/0/1111920653.3.zip and http://download.usenet-replayer.com/L/H/3/5/6/0/1111920653.2.doc) seems not to work anymore.

I will appreciate any help.

Waldemar Lipka
Mon, 25 Aug 2008 02:21:53 +0000

These links (http://download.usenet-replayer.com/L/H/3/5/6/0/1111920653.3.zip and http://download.usenet-replayer.com/L/H/3/5/6/0/1111920653.2 . . . seems not to work anymore.

If anyone has a functional copy of the file LANCTERM.EXE I would appreciate it attached to an email to Treknology (at) Gmail (dot) com. In fact, if there's a DOS version getting around tht would be welcome too. MIC

Mic
Wed, 12 Nov 2008 21:09:43 +0000

You probably want RM95EMUL / RM95EMUL

Foo Smithwicks
Thu, 13 Nov 2008 12:03:24 +0000

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