Blogs

All members are invited to blog on Applefritter. Weblogs should generally be of a technical nature and should be written in such a way as to still be readable and useful 50 years from now. Please do not embed outside media. Images and videos can be uploaded via the Media Browser. Files should either be attached to the blog post or uploaded to the file libraries.

When you post to your blog it will appear on this index and on your personal blog page. Once you've made a few posts, contact me about having a graphic added on the top of this page.

Nibble Histogram: the seeds of a disk-o-scope

Submitted by S.Elliott on November 28, 2022 - 9:40pm

What is the distribution of raw nibble values of the bitstream a Disk ][ controller would read from an ordinary DOS diskette?

What values would arise from a copy-protected game disk?  Or from a .DSK emulation of a diskette?

This little routine captures incoming nibbles and computes a moving-window histogram of their distribution.  The data usually stablizes after about 8 calls because it applies a base-2 logarithmic decay to the values after each iteration.

Tags: 
diskOscope hardware

Voyager

Submitted by doug-doug the mighty on October 11, 2022 - 6:51pm

Voyager is the name of my principle laptop. The purpose of this blog is to document my configuration for reference and troubleshooting purposes.

Enterprise_A

Submitted by doug-doug the mighty on October 7, 2022 - 7:48pm

Enterprise A is the name of one of my secondary laptops. The purpose of this blog is to document my configuration for reference and troubleshooting purposes.

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