member yoyochessboard

Our members could tell us how they became chess computers amateurs...

Moderator: Sargon72

Posts: 1
Joined: Mon Oct 16, 2017 9:16 am

member yoyochessboard

Unread post by yoyochessboard » Tue Jan 09, 2018 12:17 pm

my name is yoyochessboard and i am interested in chess computers.
i leave in France.
to be more detailled i am interested in the upgrade of the chess boards we have form fidelity electronics, mephisto, novag or others.
i am working on 6502 and 680x0 based boards.

i have sucessfully modified :
designer 2000 from 3 Mhz to 16 Mhz
designer 2100 from 5 Mhz to 16 Mhz
designer 2000/2100 display from 6 Mhz to 12 Mhz
kishon and chesster (7/8 Mhz)
excellence family (EP12,6080,6080B, par xecellence) from 3/4 Mhz to 15 Mhz with par_excellence binary
sensory revesi board from 1.5 Mhz to 8 mhz
fidelity designer 2325 from 20 Mhz to 25 Mhz (68020)
and some others (SC9,...)

i also modified a few mephisto as:
milano nigel short from 4.9 Mhz to 16 Mhz
montecarlo IV LE to 15 Mhz
and working on some module like MMIV and MMV or modena also.

my work always start by dumping the code and disassembling it to have the main aspects of the binary and see the main functions and how to modify the binary to meet the requirements of the new speed.

my main difficulty is now having access to some more un-common boards like playmatic, SC12 or polgar modules to reverse and upgrade them.

Posts: 185
Joined: Tue Jun 13, 2017 9:02 pm
Location: Los Altos, CA
Full Name: Maurice M Ohayon

Re: member yoyochessboard

Unread post by CHVL » Tue Jan 09, 2018 1:36 pm

Welcome to the ChessEval Forum!
Better to say it in French: Bienvenue sur notre site!
I hope that you will enjoy to exchange with us. I am sure that your technical skills will be highly appreciated by our members.
Tell us a little more about your computers.


User avatar
Posts: 22
Joined: Fri Aug 11, 2017 2:07 pm
Location: Barcelona, Catalunya
Full Name: Gerardo Mateo

Re: member yoyochessboard

Unread post by berger » Wed Jan 10, 2018 7:31 am

Welcome yoyo...!

I have to say that I have been collaborating with yoyo for some time now, in collaboration with the MAME development team (in particular with hap), and I have learned a lot from him in this time. ;)

Nice to have you around.

:arrow: All kind of upgrades...

Best regards,

Posts: 108
Joined: Thu Jun 15, 2017 9:52 am
Location: Netherlands
Full Name: Hans van Mierlo

Re: member yoyochessboard

Unread post by Sargon72 » Fri Jan 12, 2018 8:15 am

Hello Yoyo ,

Also a warm welcome from mine side ,the Dutch side :D
I hope u share more interesting things with us


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