We have been doing some robustness testing of the ZoomFloppy board. It uses a 7406 for driving the lines in order to be able to sink a decent amount of current to support multiple IEC devices on the bus. http://www.root.org/~nate/c64/xum1541/ What is the defined worst-case IEC bus configuration that we should support? I'd like a reasonable limit we can support while not adding too much delay for users of one or two drives. For example, Wolfgang Moser has 4 drives with a total bus length of 4 meters. The firmware works there mostly but he experiences a glitch after running a continuous test loop for a few hours. I'm looking for any specs for the limits of the IEC bus as supported by Commodore. I have the IEC timing diagram, but it doesn't describe the max bus load. You can infer the max current based on the fact that drives have 1K pullup resistors to 5V. But we'd like something more official. I'm also interested in anecdotal evidence of how many people would use this device with >2 drives. It is a USB microcontroller that supports both serial and parallel transfers via the OpenCBM software. You can also plug in multiple ZoomFloppy devices if you want to support more drives. Thanks, -- Nate Message was sent through the cbm-hackers mailing listReceived on 2010-10-31 19:00:13
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