I-Appliance BBS The Official Source for Internet Appliance Upgrades and Mods BBS Main List | Sign In | Sign Up | Search | Help | Linux-Hacker.net Reply to Thread | Printer |

Home / MISC Areas / Mattel JuiceBox OTP ROM Replacement concepts for replace the original ROM

OTP ROM Replacement (modified 0 times) prpplague Profile "this is doable, however, the amount of effort needed to accomplish this far exceeds the amount of effort to simply replace the ROM with flash and replacing with flash provides much more functionality." Absolutely! But what about the boards with COB ROM, instead of TSOP packaged ROM? I don't see empty pads for a TSOP device in the board images at: http://www.amorphousmedia.net/juicebox/juicebox.htm Are the pads on the PWB, just not in this image? On the other side of the PWB? there are several ways you can approach this. you can remove the CoB with a small file and then solder to the pads that are there. or you can leave the chip there, just cut the vss,vdd and chipselect lines to the CoB, then place a flash chip on top and solder the legs to the correct address lines. additionally you can use a flatpack flash chip and "dead roach" it to the ram chip. my initial checks show that "dead roachin" an intel fastboot flash chip with the ram should fit in the case ok. 02-10-2005 15:37:46

RE:OTP ROM Replacement (modified 0 times) Rockhammer Profile | Email What is Dead Roaching? 02-10-2005 20:07:25

RE:OTP ROM Replacement (modified 0 times) Gultig Profile It's like piggyback except the chip is on it's back like a dead roach. 02-10-2005 20:21:46

RE:OTP ROM Replacement (modified 0 times) Rockhammer Profile | Email lmao...I figured it was something like that. Thanks. 02-10-2005 20:27:11

RE:OTP ROM Replacement (modified 0 times) newell Profile you can leave the chip there, just cut the vss,vdd and chipselect lines to the CoB Umm, wouldn't you then have a unpowered ROM chip sitting on the live data and address buses, loading it down as the bus powers the ROM through the I/O protection diodes? I like the CS cut (I'd also add a pullup on the ROM side of the cut). then place a flash chip on top and solder the legs to the correct address lines Oh, this I really like. Especially if the ROM and flash devices have a similar pinout, so that you don't need much blue wire. Great--OKI shows a cross to an AMD Am29DL640D flash device! Hopefully mine has a TSOP ROM, so that I can just swap it for flash...I wonder if they brought out the write enable line to the ROM footprint... additionally you can use a flatpack flash chip and "dead roach" it to the ram chip Hmmm. That would get you the data bus, power, and about half of the address lines. The pinouts look pretty different; pile o' blue wire? 02-10-2005 22:42:10

RE:OTP ROM Replacement (modified 0 times) Valdeargos Profile If you're not too uncoordinated it's easy enough to remove SMDs by heating one "foot" at a time with a low-watt fresh-tipped soldering iron and simultaniously lifting upwards on the "leg" with an exacto. Could somebody make a list of flash chips that are viable swaps for the 27V6402G? 02-23-2005 02:44:18

RE:OTP ROM Replacement (modified 0 times) prpplague Profile If you're not too uncoordinated it's easy enough to remove SMDs by heating one "foot" at a time with a low-watt fresh-tipped soldering iron and simultaniously lifting upwards on the "leg" with an exacto. the vast majority of JB's have the CoB rom chip, which is extremely difficult to remove. cutting the chip select and using a pullup resistor to vcc is really the only viable solution. Could somebody make a list of flash chips that are viable swaps for the 27V6402G? /http://www2.okisemi.com/site/productscatalog/rom/availabledocsrom/Intro-8822.html there is really only two perfect matches for the MR27V6402G, but the samsung processor supports a wide range of flash chips, including a full line of intel chips. 02-23-2005 15:05:43

RE:OTP ROM Replacement (modified 0 times) Valdeargos Profile If I simply swap in the MX23L6410, will I be able to flash it through the JTAG interface, or are there other necessary modifications? Also, I have no idea if it's possible to access/modify the firmware images or if they must be compiled each time. Aside from CoLiLo, ìClinux,(insert decent opensource media player here), and the appropriate toolchain/makefiles what else is required to "recreate" the current flash data? Is somebody already working on this? 02-24-2005 20:09:29

RE:OTP ROM Replacement (modified 0 times) Gutierrez Profile Any suggested retailers for replacement ROM's or tutorials for the process? 05-06-2005 17:30:25

Reply to Thread | Printer | All times are PST Powered by UltraBoard v1.62

I-Appliance BBS General - NEWS, Breaking NEWS - linux-hacker.net BBS on CD Questions - User Groups in Your Town - E-Bay, Yahoo Auction LINKS ONLY (MODERATED) - Jokes & Humor - usdtv box I-Opener Areas - I-Opener General Posts - I-Opener Technical Stuff - I-Opener Technical Info Reference (MODERATED) WebSurfer Areas - WebSurfer General Posts - WebSurfer Technical Stuff - WebSurfer Technical Info Reference (MODERATED) Other I-Appliances - Virgin Webplayer - WebPal - MailStation - 3Com Audrey - ThinkNIC / Oracle NIC - Gateway/AOL Connected Touch Pad - Philips/AOL-TV - ACER NT-150 STB - MSN Companion - Compaq IA - Emachines IA - IBM NetVista IA - Intel dot.station - MSNTV2 Network Computers - Fujitsu-Siemens Scovery Linux Net Computers - GallantWeb Server Consoles - Dreamcast - xbox hacking Web Pads - Epods One General Post - Panasonic CF-01 - Fujitsu Stylistic 1200 - Cybiko Thin Clients - Thin Clients DigitalVideoRecorders - DTV Recorders, Replay, TiVo, Etc... - Tivo Hacks Linux - Midori Linux General Board - ITX MotherBoards Single Board Computers - Earth Computers mARMalade Elite Member Area MISC Areas - The Swap Meet WE TAKE NO RESPONSIBILITY FOR ANY TRANSACTION HERE AND NO COMMERCIAL POST PERIOD !!! - Wireless Net - Cameras - Robotics - Routers/Gateways - Mattel JuiceBox