MS-DOS 2.0 and "semi compatibles"

Tom Jennings tomj at
Mon Feb 27 02:04:43 CST 2006

MZ has always been the magic number.

Mark Zbikowski's initials.;jsessionid=66qkfr83sa5ae?method=4&dsid=2222&dekey=Mark+Zbikowski&gwp=8&curtab=2222_1&sbid=lc05b&linktext=Mark%20Zbikowski

On Thu, 2006-02-23 at 16:05, Kelly Leavitt wrote:
> I just imaged a disk of an MS-DOS compatible computer (Tandy 2000). Does
> anyone here know the magic number of an exe under ms-dos 2.0? I had assumed
> that it was MZ, like current exe files, but I only see 2 or 3 occurrences of
> this in the entire data stream from the disk. On the plus side, I see LOTS
> of strings that tell me I have actually read the contents of the disk (this
> machine used DS/QD drives).
> Here are some examples:
> Licensed to Tandy Corp.
> BIOS version 01.00.00
> Copyright 1983 Tandy Corp. All rights reserved.
> MS-DOS version 02.00.00
> Copr. 1981,82,83 Microsoft Corp.
> I'm guessing I need a good hex editor to look at the directory and offsets
> to see if they jibe. Any good windows based hex editors (or at least
> viewers) that anyone can suggest?
> I'll send the same message to 'classiccmp'
> Kelly

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