Amiga Cracktro Programming

1. Amiga Cracktro Programming DavidVoswinkel david@optixx.org

2. About me • Developer at www.userlike.com • Hobby projects at www.optixx.org • Gaming consoles • Micro controller • Retro computing

3. Motivation • Learned programming on the Amiga 500 • Use modern development tools • Interesting platform • Total control • Batteries included

4. Whats is a Cracktro? • Spread with pirated games released by cracker groups • via mail letters , later via modem • Mostly logo, text and music • Demonstrate technical skills • Competition & fame

5. Cracktros come in many form • Small, packed, absolute or relocatable • Standalone, injected or in bootloader • Compilations / Trainers

6. World of Wonders

7. Quartex

8. The Company &Vision Factory

9. Amiga History • 1985: Amiga 1000 • 1987: Amiga 500 & Amiga 2000 • 1990: Amiga 3000 • 1992: Amiga 1200 & Amiga 4000 • 1994: Bankruptcy of Commode Inc

10. Amiga 500 • 16/32bit Motorola 68000 CPU • 32bit registers • 16bit databus • 24bit external address bus • 7 MHz • 512KB RAM Chip Ram • OCS • Price 800 DM in 1988

11. Amiga 1200 • Motorola 68EC020 CPU • 32bit register • 32bit databus • 24bit external address bus • 14 MHz • 2MB RAM • AGA • Price 900 DM in 1992

12. Custom Chips • Original Chip Set (OSC) • Enhanced Chip Set (ESC) • Advanced Graphics Architecture (AGA) • Advanced Amiga Architecture (AAA)

13. Original Chip Set (OCS)

14. Agnus • Controls Chip RAM • DMA • Access only 512KB of Chip RAM • Hosts the Blitter and Copper

15. Blitter • BLock Image Transfer - Blit • 4 Channels, boolean combination • Copy, clear and ﬁll • Draw lines

16. Copper • Co-processor • Commands: MOVE,WAIT and SKIP • Programs are copperlists • Set video hardware registers • Change color registers mid-frame • Create rasterbars

17. Denise • Display encoder • Lowres 320x256 @50Hz PAL 32 Colors of 4096 palette • Hires 640x256 @50Hz PAL 16 Colors of 4096 palette • Interlaced • Extra-HalfBrite (EHB) • 64 Colors • Hold-and-Modify (HAM) • 4096 Colors • Dual playﬁelds • 8 Sprites 16 pixel width

18. Paula • Audio and peripheral • IO • Floppy controller • Serial port • Mouse / Joystick inputs

19. Chunky vs. Planar • Planar • Represents pixels with layered bitplanes • Info spread on different planes / RAM locations • Chunky • Packed pixel • Pixel are grouped together in RAM

20. Emulate vs Hardware • Emulator • WinUAE, FS-UAE • Lots of emulated hardware • Hardware • Real hardware with Gotek ﬂoppy emu • MIST FPGA

21. Coding 1988 • Seka assembler (later ASMone) • IDE, compiler and debugger in one • Project management • Floppy disks • Paper & pen • Pocket calculator • Documentation • Books & Printouts • Word of mouth (phone calls)

22. Load & compile

23. Run

24. Debug

25. Coding 2016 • Crosscompiler: vbcc, vasm68k and linker • Texteditor + Git • Emulators • FS-UAE • WIN-UAE • Documentation • Blogs & Forums

26. Hack…

27. Compile

28. Emulate

29. Debugger

30. Code Flow • Save system state • Turn system off • SetupVBI • Mainloop • Jump to effects routine • Jump to music play routine inVBI • Restore system state

31. Effect Explained • Logo Wobbel • Create a copperlist that manipulates the image • Static vs. dynamics • Update copperliste • Use sine LUT • Use hardware scroll register for < 16px • Bitplane scroll register for >16px

33. Getting Started • Photon’s ASMSKOOL videos & resources • http://coppershade.org/ • Amiga Cross Dev • https://github.com/kusma/amiga-dev

34. My Cracktro • Logo with wobble effect • Horizontal rasterbars • 2-pixel sinescroller • Sinescroller mirror with water effect • Background starﬁeld

35. Now Live Demo!

Amiga Cracktro Programming

Amiga Cracktro Programming

Recommended

More Related Content

What's hot

What's hot(11)

Similar to Amiga Cracktro Programming

Similar to Amiga Cracktro Programming(20)

Recently uploaded

Recently uploaded(20)

Amiga Cracktro Programming