Atari ST Knowhow Workshop 4

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Atari ST Knowhow Workshop 4 assembler and hardware
Type of Event:	Workshop
From:	2012/03/10 15:00
Till:	2012/03/10 18:00
Recurring:	no
Organizer:	syn2cat
Cost:	0 EUR0 $ 0 £ 0 CHF
Mandatory registration:
Website:	http://wiki.hackerspace.l...
Attendees:	Sid, Kwisatz, Slopjong, Thierry Log-in to RSVP
Contact Person(s):	Gunstick (mail)
Keywords:	atari st demo oldschool programming
Location
Where:	Hackerspace, Strassen (11, rue du Cimetière, L-8018 Strassen, Luxembourg)
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Getting into the detail to make the hardware do what you want

Have your emulator with assembler setup ready!

Howto:

• download hatari. It is usually in the linux repositories, but you can also get the newest release at http://hatari.tuxfamily.org/download.html
• download TOS. Hatari ships with emuTOS which should be ok, but a real TOS you can find via google http://bit.ly/waBToz
• download turboass and devpac
• Copy programming examples of workshop2 (share on lusitania) and workshop3 (git)

• Copy all that into a folder, that will be your Atari root filesystem C:
• start hatari, if you don't want emuTOS, press F12 -> ROM and browse to your downloaded TOS. Back to main menu -> Reset -> OK
• to assign the Atari root harddisk folder: F12 -> hard disks -> Gemdos drive browse & [x] Boot from HD
• change ST to medium rez: Options -> set preferences(voreinstellungen)... -> Medium(Mittel) -> OK
• double clik on C, now you should see the turboass and devpac you have put in that directory. Try to start them
• load any source. Assemble: includes may be in the wrong place, adapt the path.
• Character issues: sometimes (e.g. swiss french keyboard) you cant type a \ : F12->keyboard -> [x] Scancode
• for bigger projects like paradist you need more ram: F12 -> Memory -> 2MiB

• save config -> hatari.cfg (so next time you have all these settings correct)

Topics:

• programming the 68000 in assembler (using turboass or devpac)
  • instructions
  • the ULM intro code to get quickly started
• specificity of the Atari ST hardware (workshop 1, from the programmer's view)
  • where's my screen memory
  • memory mapped hardware
• smooth scrolling howto (recall workshop 2?)
  • word and byte scrollers
  • bit scroller
  • be creative
• color cycling effects (workshop 2 again)
  • need some drawing skills
  • more than 16 colors
• tricking the ST hardware in other ways (as seen in workshop 3)
  • the mystery of digital sound output
  • other trickery by writing directly to hardware