Joy Keys are the arrow keys and tilde(~)



When code is executed the set memory tag is or'ed with the current memory tag value.

This enables you to work out what code executed as the result of an action.

e.g. Start the Vic20 as normal to the cursor. The initial value is '1' so all executed memory locations are tagged as '1'. Invoke the debugger by pressing 'Step' or entering the debugger if you are in play mode. Change the tag value to '2'. Select 'Run' Type a character Invoke the debugger by pressing 'Step' In the disassembly window set the filter value to 2,2 and this will show all code that executed under 2 To see all code the executed exclusively under 2, set the filter value to 2,3 Each memory location has a memory tag value.When code is executed the set memory tag is or'ed with the current memory tag value.This enables you to work out what code executed as the result of an action.e.g.

Fixable Basic compiler/decompiler does not handle escape codes correctly Robotic Liberation cube does not render Audio needs a low pass filter

Unfixable Right hand shift reads as left hand as browsers don't differentiate

TODO NTSC progressive scan PAL VIC audio LFSR VIC noise LFSR Paddles Light pen 1540/1541 FDD 1520 Plotter Implement game vault based off GB20 Tape animations, counter and optional noise User logins for storing/sharing basic/assembler programs Conditional breakpoints





Email:

Copyright (c) 2009 Javascript Vic-20 by Matt DawsonEmail: [email protected] Copyright (c) 2009

Cick anywhere on page to enable audio.

Joy Keys ? Codify Display





Control

PAUSE STEP RUN



Basic Program Disassembly Memory VIC VIAs

?

Select a file from the zip to open:

Paste/Type your program then close this dialog: