A2 basic / assembly programming info

-------useful , neat, and unusual stuff-------

• BASIC:
  • SCRN(x,y) for the Hires screen. Send this routine the X,Y you want to look at on the HGR screen, and it will return the value of the pixel at that location (on or off, black or white)
  • generate a lookup table for the HGR screen
  • graphics softswitches
  • Text scrolling routines. scroll any are of the text screen in any direction FAST
  • Text printing routines. easily print strings and send dos3.3 commands from assembly
  • change where a BASIC program is loaded to in RAM
  • hplot a pixel from assembly
  • hplot a line from assembly
  • ONERR stack fix
  • Self Modifying BASIC code
  • Use 128k memory cards for extra BASIC variable storage.
  • Memory map of the II
  • Apple II video information
  • Split personality/ MTOS use 1 meg cards to run multiple programs in an a2 at the same time
  • Bob Bishop Apple II video article
  • Dos 3.3 calls
  • monitor calls
  • RW III programming info
  • Super Serial card programming info
  • parallel card programming info
  • joystick/gameport programming info
  • call monitor routines from BASIC
  • Play/record audio from the cassette port
  • Graphically Speaking FAST preshifted shape animation for hires graphics.
  • Program for creating preshifted shapes with nice interface
  • 3d program from graphically speaking
  • fill routine from graphically speaking. flood fill the Hires screen
  • dos 3.3 commands from Assembly
  • print the accumulator to COUT as a decimal number