Hello Ruud, >> If I connected the interface to the userport and used all >> four signals I intend to, will the internal circuitry >> disconnect activity on CNT1/SP1 from the userport so that >> burstmode continues to work without having to >> physically unplug the device? >I have some troubles understanding your question. You understood my question perfectly. >If you take care that your device tristates these lines when not in >operation, theoretically everything should be fine regarding the C128 using >the IEC-bus. >On the other hand nothing may pull DATA and SQRIN Low otherwise CNT1 or SP1 >could be blocked. I've since checked the circuit (not just read text descriptions...) and you are correct. I was thinking to simply use a DIODE and have the device drive the line high when not needed. I can never remember which way to face the DIODE, but do you think that this will be enough to avoid pulling on CNT1 and SP1? Regards, Nick PLEASE TAKE NOTE: The contents of this email (including any attachments) may be privileged and confidential. Any unauthorised use of the contents is expressly prohibited. If you have received this email in error, please advise us immediately (you can contact us by telephone on +61 8 9441 2311 by reverse charge) and then permanently delete this email together with any attachments. We appreciate your co-operation. Whilst Orbital endeavours to take reasonable care to ensure that this email and any attachments are free from viruses or other defects, Orbital does not represent or warrant that such is explicitly the case (C) 2000: Orbital Engine Company (Australia) PTY LTD and its affiliates Message was sent through the cbm-hackers mailing list
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