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 Forum index » DIY Hardware and Software » Circuit Bending
modify PSR E343 flash chip to load my samples
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xphanoo



Joined: Feb 01, 2015
Posts: 1
Location: fzefqef

PostPosted: Sun Feb 01, 2015 7:00 pm    Post subject: modify PSR E343 flash chip to load my samples Reply with quote  Mark this post and the followings unread

Hey

I have a psr E343 and i'd like to tweak its samples

I heared that the Yamaha PSR E series holds its program and sample data in a flash chip. I opened my keyboard and found those :

s29gl128s90tfi02 16Mb flash
splc780d LCD controller
W9816G6IH-7 2Mb sdram
swl01u Yamaha custom chip

The flash is a standard TSOP 56 pin package, i think it's NOR flash (not NAND)

i plan to use this tool to dump/write the chip without soldering or desoldering it: http://store.logic-sunrise.com/fr/outils-flash-ps3-downgrade-jailbreak/939-e3-nor-flasher.html


But if i manage to get the chip's contents, i'll have to understand how the program works, where are the samples, if they are compressed or not.. (if they arent i can easily decode 8/16 bit PCM). I'm a programmer and i like electronics, but i dont know if it's -humanly- possible.

Do you think it's a waste of time and money ? Is it worth tying ?

It could be fun to have my samples on this keyboard... maybe upgrading from 16Mb to 32Mb chip too (dunno if the CPU can handle this)

Do you think there is an instrument sample size limit ? I mean, i don't know if the current instrument playing is copied into RAM for playing, or of it's directly "streamed" from the flash. This synth car have 16 different instruments playing at the same time, divide 2Mb RAM into 16 you get 125Kb, that seems too small
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