====== QL Assembly Language Programming ======
{{books:0-07084-777-0.jpg?direct|QL Assembly Language Programming by Colin Opie}}\\ 
QL Assembly Language Programming is an advanced technical guide to 68000 assembly language and QDOS.


The book was written by Colin Opie with the assistance of [[qlwiki:Tony Tebby]] and is intended for use with [[qlwiki:McGraw-Hill's 68000 assembler]] / editor package, which was sold separately for £29.95


The book covers the 68000 processor itself, with its instructions and addressing modes, QDOS calls and has a number of chapters full of example programs.


McGraw-Hill's 68000 editor is written in SuperBASIC. Its line management works with an array. To add and/or delete lines, the editor uses a resident extension


<code>
ROOM_BIN
</code>

containing two resident procedures


<code>
MAKE_ROOM
TAKE_ROOM
</code>

written by Tony Tebby, which is used to insert ("MAKE_ROOM") or delete ("TAKE_ROOM") a line within the array "on the fly" without losing content. This extension seems to be the first one used for such purposes, written in 1984.


ROOM_BIN was later used by Tony Tebby's own "inhouse" editor "sedit", and "sedit" (which seems to be the prototype for the McGraw-Hill editor) was much later rewritten by Ralf Reköndt with new resident heap extensions and released as "S_Edit", marketed by Dilwyn Jones, now freeware.


 ----
Title: **QL Assembly Language Programming**\\ 
Author: Colin Opie\\ 
Publisher: McGraw-Hill\\ 
Year of Publication: 1984\\ 
Commercial Status: Unknown\\ 
Price as at February 1985: £12.95\\ 
Reviews: QL User (Feb '85)\\ 
ISBN: 0-07084-777-0