Defining Disk Image Dump Standard

From: Sellam Ismail <foo_at_siconic.com>
Date: Wed May 31 16:29:39 2000

On 31 May 2000, Eric Smith wrote:

> On some later Infocom titles for the Apple ][ family, they went to two
> disk sides, and in order to maximize the amount of data on the second
> size (and hence minimize flipping), they went to *one* sector per track.
> This does away with the "wasted space" of intersector gaps.

Interesting. I never came across any of those. It probably also had the
added advantage of allowing for very quick reads.

Do you know of any specific titles that used such formatting? I probably
have a few of the originals and I'd like to check it out.

> Where they screwed up, though, was in sticking to a single byte of XOR
> checksum over the entire "sector". The checksum scheme Apple used was
> arguably inadequate for 256-byte sectors; it was truly horrible for
> >5.5 Kbyte sectors.

Truly.

Sellam International Man of Intrigue and Danger
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Received on Wed May 31 2000 - 16:29:39 BST

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