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Retro Curmudgeonry

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Dissecting Atari Display Lists

A while ago I was working on a project and needed to know where the Atari OS chose to create its graphics modes in memory. I ended up making a tool in BASIC XL that walks the current display list, and describes each ANTIC instruction. The output looks like this below. The example is a dump of the GRAPHICS 2 display list which includes a text window: Disassembled Display List (GR2)to its corresponding graphics lineand Scan Line...DL Byte Value Gfx Line Scan Line(s) TV Scan Lin

kenjennings

kenjennings

 

Part 11 -- Simple Assembly for Atari BASIC (The End) - Binary File I/O Part 2 (XIO Is Broken)

Binary File I/O (Part 2 of 2) ============================================================== Part 1 - Introduction http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 - Learn 82.7% of Assembly Language in About Three Pages http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for-atari-basic/ Part 3 - The World Inside a USR() Routine http://atariage.com/forums/blog/576/entry-13177-part-3-of-11-simpl

kenjennings

kenjennings

 

Part 10 of 11 -- Simple Assembly for Atari BASIC - Binary File I/O Part 1 (XIO Is Broken)

Binary File I/O (Part 1 of 2)   ============================================================== Part 1 - Introduction http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 - Learn 82.7% of Assembly Language in About Three Pages http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for-atari-basic/ Part 3 - The World Inside a USR() Routine http://atariage.com/forums/blog/576/entry-13177-part-3-of

kenjennings

kenjennings

 

Part 9 of 11 -- Simple Assembly for Atari BASIC - Memory Copy

Memory Copy ============================================================== Part 1 - Introduction http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 - Learn 82.7% of Assembly Language in About Three Pages http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for-atari-basic/ Part 3 - The World Inside a USR() Routine http://atariage.com/forums/blog/576/entry-13177-part-3-of-11-simple-assembly-for-ata

kenjennings

kenjennings

 

Part 8 of 11 -- Simple Assembly for Atari BASIC - Convert Integer to Bit String

Convert Integer To Bit String ============================================================== Part 1 - Introduction http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 - Learn 82.7% of Assembly Language in About Three Pages http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for-atari-basic/ Part 3 - The World Inside a USR() Routine http://atariage.com/forums/blog/576/entry-13177-part-3-of-11-simpl

kenjennings

kenjennings

 

Part 7 of 11 -- Simple Assembly for Atari BASIC - Convert Integer to Hex String

Convert Integer To Hex String ============================================================== Part 1 - Introduction http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 - Learn 82.7% of Assembly Language in About Three Pages http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for-atari-basic/ Part 3 - The World Inside a USR() Routine http://atariage.com/forums/blog/576/entry-13177-part-3-of-11-simpl

kenjennings

kenjennings

 

Part 6 of 11 -- Simple Assembly for Atari BASIC - Various Bit Manipulations

Bit Operations ============================================================== Part 1 - Introduction http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 - Learn 82.7% of Assembly Language in About Three Pages http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for-atari-basic/ Part 3 - The World Inside a USR() Routine http://atariage.com/forums/blog/576/entry-13177-part-3-of-11-simple-assembly-for-

kenjennings

kenjennings

 

Part 5 of 11 -- Simple Assembly for Atari BASIC - Implement DPOKE

DPOKE ============================================================== Part 1 - Introduction http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 - Learn 82.7% of Assembly Language in About Three Pages http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for-atari-basic/ Part 3 - The World Inside a USR() Routine http://atariage.com/forums/blog/576/entry-13177-part-3-of-11-simple-assembly-for-atari-bas

kenjennings

kenjennings

 

Part 4 of 11 -- Simple Assembly for Atari BASIC - Implement DPEEK()

DPEEK ============================================================== Part 1 - Introduction http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 - Learn 82.7% of Assembly Language in About Three Pages http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for-atari-basic/ Part 3 - The World Inside a USR() Routine http://atariage.com/forums/blog/576/entry-13177-part-3-of-11-simple-assembly-for-atari-bas

kenjennings

kenjennings

 

Part 3 of 11 -- Simple Assembly for Atari BASIC

The World Inside a USR() Routine ============================================================== Part 1 http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for-atari-basic/ Part 3 http://atariage.com/forums/blog/576/entry-13177-part-3-of-11-simple-assembly-for-atari-basic/ Part 4 http://atariage.com/forums/blog/576/entry-13178-part-4-of-11-simple-assembly-for-at

kenjennings

kenjennings

 

Part 2 of 11 -- Simple Assembly for Atari BASIC - Learn 82.7% of Assembly Language in About Three Pages

Learn 82.7% of Assembly Language in About Three Pages ============================================================== Part 1 - Introduction http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 - Learn 82.7% of Assembly Language in About Three Pages http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for-atari-basic/ Part 3 - The World Inside a USR() Routine http://atariage.com/forums/blog/576/entry-13177-part-3-o

kenjennings

kenjennings

 

Part 1 of 11 -- Simple Assembly for Atari BASIC - Introduction

Simple Assembly for Atari BASIC A multi-part discussion of a few pet peeves about Atari BASIC and simple machine language utilities to fill in the gaps. July 2016 ============================================================== Part 1 - Introduction http://atariage.com/forums/blog/576/entry-13175-part-1-of-11-simple-assembly-for-atari-basic/ Part 2 - Learn 82.7% of Assembly Language in About Three Pages http://atariage.com/forums/blog/576/entry-13176-part-2-of-11-simple-assembly-for

kenjennings

kenjennings

 

Convert Binary File to BASIC XL Data

Sifting the heap of aged floppy disks has turned up an interesting pile of ... shtuff.   Machine language routines can be a big help to Atari BASIC/BASIC XL programs boosting performance and providing nifty features not included by BASIC. That is, provided the machine language routine can be brought into the BASIC program. In this case the Atari BASIC language can be like an island fortress repelling all invading data, because the language makes it inconvenient to get a machine language r

kenjennings

kenjennings

 

Grid Edit Character Set Editor

A short time ago I found some (debatably) useful utilities for the Atari 8-bit while scraping a crate of old floppies into ATR files. One of these is a character set editor I have been working on (and off) for a few decades. I spent most of July adding a few useful features for the modern era of Atari emulators, and dealing with some bugs.   So, here's a new toy to play with, GRID EDIT. The attached ZIP file will unpack to an ATR. I ordinarily use this as D2:.   GRIDEDIT_ATR.zip   Be

kenjennings

kenjennings

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