Saturday, October 15, 2016

Read sector functionality of the Alto-Diablo disk tool is working well, minor issues to address overall

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Morning spent as Volunteer Examiner administering ham radio license tests, back to tool in the afternoon. ALTO DISK TOOL I came up wit...
Friday, October 14, 2016

All apps and diagnostics workign on Xerox Alto II, redesigning key component of disk tool

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RESTORATION OF XEROX ALTO II We spent the morning working on the Alto. The machine, as we received it, had a 1K CRAM (RAM for microcode) b...

Verified data and formating on disk cartridge, working through my logic to read the header field

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ALTO DISK TOOL The steps that will occur and must be verified, with completed steps in gray: Readsector  logic is waiting for a sect...
Thursday, October 13, 2016

Working carefully through entire read sector using logic analyser

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Today I spent time with the rest of the 1401 Restoration Team at CHM. ALTO DISK TOOL I have begun a methodical check of the entire ...
Tuesday, October 11, 2016

Have matching board sets for Alto, debugging read sector operation on real disk drive

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ALTO II RESTORATION Our working hypothesis for our current problem with the Alto is that our CRAM board is mismatched with our Control boa...

New level shifting board appears sound, testing of read sector logic underway

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ALTO DISK TOOL I began the morning with a careful wiring check of the new level shifter/driver board, ensuring no solder bridges, all sig...
Sunday, October 9, 2016

Analog challenge addressed in Disk tool to Diablo interfacing

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ALTO DISK TOOL Level shifting circuits still not performing to my satisfaction. The reference driver logic from Diablo is a pair of MC858...