[Coco] Machine Code

[Salvador Garcia]

I agree with you Dave. Way back in the mid 80s I was deep into 8088 assembler and got to the point where I could recognize certain sequences just by looking at the machine code. This came in handy when doing dumps using DEBUG without having to disassemble.

Getting back into the 6809 vibe. If I have VCC and would like to use EDTASM+, how would I go about doing this? I assume that I need to get a DSK image, but any pointers would be helpful;.

Salvador

      From: Dave Philipsen <dave at davebiz.com>
 To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> 
 Sent: Wednesday, May 31, 2017 1:57 PM
 Subject: Re: [Coco] Machine Code
   
Actually, understanding 'machine code' can be very beneficial.  If 
you're going to write code in assembler, why not understand exactly 
what's going on under the hood?  I can't tell you how many times I've 
just done a quick dump of memory and seen certain combinations like "7E 
80 00" or "1A 50" or "20 8D" or "12" or "39" and recognized what was 
happening even without using a disassembler.  It's true that virtually 
no one writes in "native machine code" but I have, on many occasions, 
patched code for purposes of experimentation/testing with machine code.  
And, in some very rare cases where I was working from a monitor that did 
not include an assembler or disassembler on a platform (usually an 
embedded controller) where it wasn't necessarily easy import and test 
new code, I have actually written a bit of "machine code" or 
cross-assembled on another machine and manually entered the code 
byte-by-byte on the target machine.

And I do agree that starting out with EDTASM+ and a good tutorial is the 
best...

Dave


On 5/31/2017 12:36 PM, tim franklinlabs.com wrote:
>    I'm curious what you consider "Machine Code"? Assembly and Machine Code
>    are, for all practical purposes, the same thing. Machine Code by
>    definition is the actual numbers put into RAM/ROM locations. I don't
>    know anyone who actually writes in native machine code. They always use
>    assemblers to create the machine code.
>    As mentioned by another poster, it's best to start with EDTASM and a
>    good Assemblers "How To" book.
>
>      On May 31, 2017 at 11:53 AM John Mark Mobley
>      <johnmarkmelanie at gmail.com> wrote:
>
>      How do you practice simple machine code on a CoCo. This is just to
>      teach
>      the basics of machine code as an introduction to assembly.
>
>      What steps should one follow to practise machine code.
>
>      -John Mark Mobley
>
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> References
>
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>


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