Re: A89: Starting out assembly, need help

To: <assembly-89@lists.ticalc.org>
Subject: Re: A89: Starting out assembly, need help
From: "Dux Gregis" <assets@eden.rutgers.edu>
Date: Tue, 1 Dec 1998 00:33:50 -0500
Delivered-To: assembly-89-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-89@lists.ticalc.org


The timing doc on ticalc.org has the timings as abs.s - 8/12; abs.l - 12/16;
d(pc) - 8/12; immediate - 4/8

I don't really know how to interpret these numbers; I don't even know what
is meant by abs.s or abs.l
it _would_ be nice to know though, if anyone would like to enlighten :-)

I don't see any reason why one method would be any faster than the other; if
there is a difference, it's probably trivial.   But, if you use a relative
address often (excluding looping over a relative address), you will save
space over an absolute address since the opcode is shorter.  It's probably
best to use relative addressing except when you need to create data
structures.


>
>So the only advantage to declaring variable within your program is that
>it is faster because it uses relative addressing?  It woudn't be smaller,
>though, because any memory that you save by using relative addressing is
>lost in the space used for the variable, right?  How many bytes are saved
>by using relative addressing, anyway?
>
>Justin Bosch
>justin-b@juno.com
>
>On Mon, 30 Nov 1998 22:53:58 -0500 "Dux Gregis" <assets@eden.rutgers.edu>
>writes:
>>
>>Yes, at the end of each row there are 10 bytes (I think) and then rows
>>101
>>through 160 (I think) are completely empty: 30 bytes each.  I might
>>not have
>>the exact numbers right, but there is a lot of memory here unused by
>>anything else.
>>
>>>
>>>I was wondering how calculators with differing screen sizes could run
>>the
>>>same programs, considering that these programs write to specific
>>pixels.
>>>Where exactrly is the video memory, and what parts are unused?  Is
>>there
>>>a "chunk" at the end of each row?
>>>
>>>Justin Bosch
>>>justin-b@juno.com
>>>
>>
>>
>
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