Inside Commodore DOS [PDF]

Richard Immers and Gerald G. Neufeld:
Inside Commodore DOS : the complete guide to the 1541 disk operating system.
Northridge, Calif. : Datamost, 1985.
ISBN 0-8359-3091-2

(512 pages, 7.4 MB PDF)

In my quest to preserve retrocomputing documents, here is the invaluable book “Inside Commodore DOS”, which describes most of the internals of the Commodore 1541 disk drive. The scanning was done in 2002 by Kenneth S. Moore, who in 2005 released an OCRed version, which unfortunately replaced the original page images. My version here comes with the original page images and a table of contents, and is nevertheless fully searchable.

Here is a fun quote from the book by the way:

Over the years numerous writers have advised Commodore owners not to use the save and replace command because it contained a bug. Our study of the ROM routines and a lot of testing has convinced us that the bug in the replace command is a myth.

Of course, this is wrong. Don’t use “SAVE@” on a 1541.

pixelstats trackingpixel

11 Responses to “Inside Commodore DOS [PDF]”

  1. [...] 10 OPEN 1,8,14,”#”20 GOTO NERDCORE? von Fabu in Spielkram Tags: 80er commodore pdf Wenn dir dieser Artikel gefallen hat, abonniere doch den Feed von ?Superlevel?, um keinen der zukünftigen Beiträge zu verpassen. Wir berichten täglich über Online- und Freewaregames, Klassiker der Spielegeschichte und sonstige Perlen der digitalen Unterhaltung.(Hinweis schließen) « [...]

  2. Ingo Korb says:

    Ah, yet another book that condems B-R and B-W because the authors didn’t understand what the commands actually do – they’re not meant to do the same thing as U1/U2. The only accurate description I’ve seen is in the original Commodore manuals, the only program I’ve seen that uses them is Pirates! (could be a feature specific to the ESI crack) which stores some of its texts directly in disk sectors and relies on B-R to get the length right.

  3. MagerValp says:

    The 1541 manual has a really crappy explanation of B-R and B-W, and doesn’t really explain how they work – you have to read the section on U1/U2 and try to figure out what they do. The 1571 and 1581 manuals are better.

    B-R and B-W are pretty useless though, and U1/U2 are almost always what you want.

  4. [...] Inside Commodore DOS: ?Inside Commodore DOS : the complete guide to the 1541 disk operating system.? [...]

  5. [...] Inside Commodore DOS: ?Inside Commodore DOS : the complete guide to the 1541 disk operating system.? [...]

  6. [...] Inside Commodore DOS e a história do FCopy para Commodore 64. [...]

  7. silverdr says:

    Kudos! Great job! I used the scanned version before and had to correct it as the pages were mixed and duplicated but never made it to make it searchable.

  8. [...] muita documentaç?o sobre computadores clássicos e entre elas uma vers?o digital do Inside Commodore DOS de [...]

  9. %blog title% s retailers of nutrients, give boundless vitality, help optimum nuttrient amounts and invigorate good health.
    The ecosystems supported from the soils humus are responsible for your wellbess in the soils.
    Amongst several factors, steering clear of nicotine,
    alcohol, and in search of to reduce worry levels are important.

  10. Ken Moore says:

    I’m glad to see the version I scanned for everyone many years ago has had work done to it to improve it.. At that time I just didn’t have the time to work more seriously on it, but I wanted people to have an electronic copy to refer to.

    Ken Moore

  11. Ken Moore says:

    addendum to my previous post:

    The PDF I created was done in 2002.

Leave a Reply

To prove you're a person (not a spam script), type the security word shown in the picture. Click on the picture to hear an audio file of the word.
Click to hear an audio file of the anti-spam word