From: Brian Ketterling (tweel8502_at_hotmail.com)
Date: 2003-03-21 01:22:12
>From: David Wood <jbevren@starbase.globalpc.net>
>
> > either the pinout above is wrong, or Viza intentionally jumbled up
> > the lines (maybe as a scheme to keep people from reading/copying
> > the ROM?).
>
> ..or they laid it out in this manner to make it easier to design the
>cartridge (no crossed wires or vias, for example). Either possibility
>isnt all that uncommon.
Humm... so one views the cartridge as a black box? That is, it doesn't
matter if externally-consecutive addresses are in fact scattered internally
throughout the EPROM, so long as a unique address on the buss accesses a
unique location? And the same for the order of the data bits? ( sorry if
this is elementary :-)
Is there some way to defeat the cartridge's autostart feature so that I can
read (PEEK/LDA) and dump the EPROM? My version of Vizastar is XL4, I know
someone who has XL8, I'm interested in seeing if I can upgrade mine, and
he'd like to make a copy of his.
Thanks,
Brian
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