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A project log for Ferrite Core Memory Module

A sub-project of the ED-64 Computer to document the development of a 64-byte ferrite core memory module

Andrew StarrAndrew Starr 04/22/2017 at 06:033 Comments

The components for the Inhibit driver arrived yesterday. I populated the module, plugged it in, connected the inhibit lines, and loaded the arduino with a checkerboard memory test I wrote a couple of weeks ago.

And....it works!

No memory errors after 100,000+ iterations, each iteration consisting of writing a pattern byte (0x55 or 0xaa) to all memory locations, then reading all memory locations, checking the data read against the pattern.

This project is now complete, and I can move on with the rest of the ED-64 build. Yay!

Discussions

Yann Guidon / YGDES wrote 04/22/2017 at 07:24 point

0x55 and 0xAA are nice but only 1/128 of the coding space.

Now, use a 32-bits LFSR ;-)

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Blecky wrote 04/23/2017 at 02:11 point

Those values do test the most extreme condition though; a full state change for each bit with an alternating bit pattern (10101010 -> 01010101).

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Yann Guidon / YGDES wrote 04/23/2017 at 02:16 point

well, it depends...

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