Monday, November 7, 2016

New logic for handing incoming bit stream working, dropped sector error rate by half

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ALTO DISK TOOL My initial testing showed much of the new logic seemed okay, but the critical part that recognizes whether a bit call has ...

Developed new approach to handling the clock and data signals from the drive

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ALTO DISK TOOL I spent a couple of days examining different ways to handle the incoming ReadClock and ReadData signals, to deal with the ...
Saturday, November 5, 2016

Possible situation causing misreads

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ALTO DISK TOOL I spent the day poking at various locations, observing the signals and trying to find a cause for intermittent checksum fa...
Thursday, November 3, 2016

Inconclusive investigation of one sector that receives checksum errors

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ALTO DISK TOOL Today I am going to dig deeper into sectors that had checksum errors while being read, to see if I can spot anything in th...

Restored the erased sectors on Cylinder 0, then began data analysis of the extracted disk image

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Today is my day working at CHM on the 1401 systems, but I did some work in the late afternoon and evening.  ALTO DISK TOOL I received...
Tuesday, November 1, 2016

WriteSector working properly now

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ALTO DISK TOOL It is awkward to switch between monitoring writing and reading, as the signals to be sent to the logic analyzer are mostly...

Digging into what is on the disk surface, what I read and what I wrote

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ALTO DISK TOOL I happened to set up the scope to trigger on SectorMark and show the incoming stream from the disk heads at various delays...