Hello Ruud, >So what gives you the idea it does negate the lines? The diagnostics built into 64HDD show that when the U0>M1 is sent to a real 1571 (64HDD is just listening and not taking action) the ATN line and Data line are for sure negative, enough to time-out the Wait_For_CLOCK(RELEASE) routine three times (about 1.5seconds). This suggests to me that all three lines are "held" low for the period... not expecting it to be logical for the ROM routines to do it... I though perhaps it was caused by the drive "re-booting" when switching modes.. it definitely involves some mechanical noises. The drive does work in both modes.... Do you know what comes after the check for 1 or 0. It needs to step-up to 2MHz, could the circuit associated with this be the cause? - 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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