43 replies to this topic

[Martin]

I have some service manuals (with schematics) at http://martin.poupe..../servicemanual/, they may help you.

[IlPilota]

Hi Matze have you have been successful to upgrade you cal CFX9850GB+ ?
Have you found a CFX9950GB+ PCB?


I have a CFX9850GB+ PCB ZX939 the same as you and I’m trying to upgrade the 32kb ram to 64kb
R21 and R20 don’t work for me, taking out the R21 the cal don’t work. R21 disconnect (chip enable from the main ram Toshiba chip TC55257-32 kb)

R18 / R19 and R22 / R23 don’t make changes on the cal. (connected to sanyo LC3564SM - 64Kb to CE1 CE2, chip enable)

I have semantics from CFX9850G not form CFC9950GB+ and I have schematics Toshiba TC55257, sanyo LC3564SM etc

Can you help me please?

What I have in mind is to put some inverter on the PCB of the cal and change all R18 / R19, R20 / R21, R22 / R23 instead of put a new RAM chip on top of ROM


Thank you!
Marco

Ciao Marco sei italiano?

[MARCO_casio]

Thank you MicroPro. is was verry nice of you to reply. I know is very old... but I have post any way.

[MicroPro]

You're welcome... but didn't Martin's new post help more?