On Wed, 11 Jun 2014, Gerrit Heitsch wrote: > No matter how, you will still have to return RESET to +5V before you > can read and dump the ROM. :) Sure, but that could be done using one of the ports controlling e.g. a 4053 to select either 5V or 10V as the RST voltage (assuming that there's not much current flowing, which mustn't be the case anyway when using a simple DC voltage doubler for the 5V->10V conversion). When reset, the selecting is implicitly set to 0, then the first operations in RAM could be setting that port to 1. > That depends on the target audience for the datasheet of course. Sure. But those internal datasheets often enough don't make it into the wild as they are only supplied to a very limited set of customers such as manufacturers for programmers and test equipment where it might be somewhat easy to track back where it originated from. After all, not getting (easy) access to the internal program is often enough part of the security model (and a reason not to chose 8048/51). > Do you have a datasheet for that one somewhere? http://www.buchty.net/ensoniq/files/r6500.pdf Rainer Message was sent through the cbm-hackers mailing listReceived on 2014-06-11 17:00:03
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