Really stupid PDP assembler question

From: Paul Koning <pkoning_at_equallogic.com>
Date: Fri Jun 25 17:02:45 2004

>>>>> "wai-sun" == wai-sun chia <squidster_at_techie.com> writes:

 wai-sun> *WARNING: NEWBIE ALERT* Ok. I must be an idiot. I for the
 wai-sun> life of me cannot figure out why is it when I say:

 wai-sun> 1000: .ASCIZ /HELLO WORLD!/

 wai-sun> After assembling and linking it turns out that:

 wai-sun> 1000: 042510 ;H=110, E=105 ...

 wai-sun> Why is the octal ASCII code and the content of the addresses
 wai-sun> different?

They aren't.

Remember that bytes are 8 bits and octal gives you 3 bits per digit.
So (unlike hex) the boundary between the two bytes is "in the middle"
of the fourth digit.

The word is (0105 << 8) + 0110 which 042510 as you showed, and
similarly for the other words.

    paul
Received on Fri Jun 25 2004 - 17:02:45 BST