Deduping the 35,117 Applesoft BASIC files using an MD5 hash, we get down to 25,464 files. What are the most frequent tokens in those files? How many files does each token appear in? And on how many disks?

Of the 6,998 “normal” disks in the Apple II Disk Corpus, 5,870 of them contain at least one Applesoft BASIC file. As mentioned in a previous post, this amounts to 35,117 Applesoft BASIC files in this subcorpus.

In the previous post I speculated that the counts of file names in the corpus might be skewed due to the number of disks cracked by 4am. In this post I separate them out.

I decided to extract the file metadata from disks with a standard layout.

Following on from the previous post, I started wondering where the different DOS-3.3-style boot sector types diverge so I constructed the following visualization.

We previously looked at all sectors across the Apple II Disk Corpus but what about variation in the boot sector? In other words, track 0 sector 0.

As we saw in the previous post, ten out of the top 20 sector types start with 00 11 0X 00 and continue with all zeros. I suspected why this might be the case and I’ve now confirmed the reason.

A regular Apple II floppy disk has 560 sectors of 256 bytes. Across the 12,450 disks in the current corpus, that’s 6,972,000 sectors. How many unique sector types are there and what are the most common?

Having ranked all the byte values across 12,450 Apple II disk images, how might a specific disk differ?

Which are the most common byte values across the 12,450 Apple II disk images?

I want to get a lot of 6502 machine code, BASIC source, etc. so I’ve gathered a few thousand Apple II disk images.

Okay, I’ve started a repo (and even came up with a Tolkien-inspired acronym)! If you’re interested, star / watch the repo. I’ll start some discussions there too.