|I'll be back soon...|
Message #4 Posted by Vieira, Luiz C. on 10 Sept 2003, 11:21 a.m.,
in response to message #1 by Nelson M. Sicuro (Brazil)
Hi all you guys;
I read my name and thought I should answer... (Thanks, Renato).
About Voyagers, all I get was taken from some stuff I collected myself and many information posted here by guys like Tony Duell, Ellis, Pavel, Meindert and Vassilis among others (if I misspelled the names or forgot someone, forgive me). What I have so far is information related to ID codes for some IC's, LCD different types and a few HP15C compatible "IC" mixing. What I saw, based on Tony's observations, is that the main NUT-based chips (derived from the NUT-family used in the HP41) have internal ROM data, being the main chip the R2D2. No, not the golden android from Star Wars, instead RAM_ROM&Display_Driver. This main NUT is also the controller, and I cannot imagine a way to dump internal ROM contents unless there are some "hidden" codes that allow it to be done. The main subject is the extra third chip available in the HP15C: is it only a 64 extra registers CHIP or it also contains ROM-code? As the HP15C's owners know well, the HP15C has 67 registers (plus Random seed register), and 64 of them are shared with program lines. And that's the main part!
I'm in the middle of some time consuming activities and I'm visiting the MoHPC pages about twice a day in a "read-only" basis. That's why many of you have not heard my "voice" so often, but don't be so "happy"... I'll be back soon.