Monday, October 31, 2016

Still trying to find cause of failure to write

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ALTO DISK TOOL Some conditions are tested for by the circuitry in the Diablo and would result in a WriteCheck condition: WriteGa...
Sunday, October 30, 2016

Continuing work on Write Sector, now questioning operation of disk drive circuitry

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ALTO DISK TOOL I completed the reinstrumentation to watch the behavior of the WriteSector and to ensure that the transition stream matc...
Friday, October 28, 2016

Debugging write operation to disk drive

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ALTO DISK TOOL I had to drive over and swap cars with my daugther, hers has problems. After lunch, I got back to the project. I continued...

Write Sector logic working properly yet drive not actually writing

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ALTO DISK TOOL Step one in tightening up the WriteSector process is to draw up a precise timeline of the timing of each word to be writte...
Thursday, October 27, 2016

Debugging write sector function, almost done but timing is a bit too long to fit in sector

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ALTO DISK TOOL I set up the first combination of signals to watch on the logic analyzer to get to the bottom of this misloading of the se...
Tuesday, October 25, 2016

Working through the WriteSector transaction, step by step, first part of Header record

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ALTO DISK TOOL Finally ran the tests to see what is happening when I attempt to write to RAM thru the USB transaction. I found a race h...
Monday, October 24, 2016

Prepping for write function tests, debugging RAM load

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ALTO DISK TOOL Setting up for the disk writing tests was quite involved. I prepared a memory file of the original sector 0 value for the ...