Marko Mäkelä wrote: > What are jumpers SJ1, SJ2, SJ3 for? You could label all signals. > When the board is initially produced, the uC will not be installed, so the jumpers connect the READ/WRITE/SENSE lines from input to output. I will label the board tonight. > Also, Kicad <http://kicad.sourceforge.net> is a free (as in speech) > alternative to Cadsoft Eagle. I haven't looked at yet, but if it is > good enough for a mobile phone <http://wiki.openmoko.org/wiki/Gta02-core>, > it should suffice for any hobby project. > I've downloaded it, and it looks like a nice tool, but I've invested a lot of time in EAGLE libraries and designs. I admit I did not do an exhaustive search, but I was having trouble finding a nice way to convert libraries and designs to KiCAD. The scripts I found were incomplete or contained errors. > What about a small prototyping area or a header for all (or unconnected) > pins of the microcontroller? The circuit could be more useful if you > could connect it to something else (e.g., computer, or memory card and > at least one switch). I think that a tape drive emulator requires a > PLAY button with which you can initiate the transfer (or select tracks). > I intended that folks would install a IC socket for the uC, and that could accommodate connection to the unconnected pins via a daughterboard. > If you boot up the computer with SENSE=0, it will "think" that you are > trying to rewind or fast-forward the tape, and it will be supplying power > on the MOTOR line. That is why you need to control the SENSE line in some > way. > Well, as it is wired right now, SENSE will come up as an input, so I think I'm OK. I'll wire in the voltage divider for MOTOR. Jim Message was sent through the cbm-hackers mailing listReceived on 2009-06-29 19:35:38
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