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I'm afraid this email address is not in use anymore. I have just received a mail delivery error message.

I have recently found this article on the web: http://www.angelfire.com/electronic2/ti99/memupgrade.htm It is quite old but seems interesting to me since probably cheap and does not require any modification inside the console. I tried to contact (email) the author but no reply received. Does anybody know more details (e.g. schematics) about this memory expansion? Thank you in advance for any help.