Line A variables at negative offsets, info wanted.

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Article #1069

#1069

From: TPC862
Date: Wed, 04 Jun 1986 15:44

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Date: 4 June 1986, 10:38:33 EST
From: Ton van Overbeek          +31 1719 83041       TPC862   at ESTEC
To:   INFO-ATARI16 at SU-SCORE.ARPA
Subj: Line A variables at negative offsets, info wanted.

There are Line A variables at negative offsets from the Line A variables
base address returned by the $A000 opcode. See for instance the listing
of the HI50 program recently posted on the net and the info on the
position of the text cursor a while back. In the toolkit info I have
only the Line A variables at positive offsets are described.
Does anybody have a description of all the line A variables and their
meaning ? If so, please post it and/or mail to me.
It seems that with these 'negative' Line A variables you can implement
font loaders, change fonts, etc.
Thanks for any info.

Ton van Overbeek
European Space Research and Technology Centre (ESTEC)
Control Systems Section
P.O.Box 299
2200 AG Noordwijk, The Netherlands.
Phone: +31 1719 83041
Email: TPC862%ESTEC.BITNET@WISCVM.WISC.EDU  (ARPA)
       TPC862@ESTEC                         (EARN/BITNET)

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Subject: Line A variables at negative offsets, info wanted.
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Date: Wed, 4-Jun-86 11:44:00 EDT
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