Denial

Not much faster, and untested, but you might try out this one instead: ; ***************************** ; * Draw 2x2 Tile on screen * ; * A = Tile Number * ; * X = Column 0-20 * ; * Y = Row 0-21 * ; ***************************** STA tile_ptr LDA #0 ASL tile_ptr:ROL A ASL tile_ptr:ROL A STA tile_ptr+1...

Works but a bit memory heavy. This method takes away 2K just for a constant definition of the character set, and then you still have to add in the screen data. IMO, using a bitmap (like MINIGRAFIK/MINIPAINT) or doing 'sparse' hires displays (like Ghislain does in his splash screens) makes better us...

OMG, ML code tucked away in a REM statement...LOL... Take a look here for a similar feat for a joystick decoding routine. ;) You just have to take care, that the ML code does not contain any null bytes, as these would be interpreted as end-of-line (and the two following bytes would be changed by th...

Well there's always cc65, but that's a cross-compiler and different language of course. Most of the speed enhancements of Austro-Comp stem from: - pre-evaluating constants (so it's not 'necessary' anymore to put often used values into variables), - calling the arithmetic routines in the BASIC interp...

This is for unexpanded VIC-20: 0 REMZZZZZZZZZZZZZZZZZZZ 1 FORT=0TO18:READA:POKE4102+T,A:NEXT 2 DATA32,241,215,134,252,165,162,133,251,56,165,162,229,251,197,252,144,247,96 Line 0 contains 19 Z's. Run this once. After this, you can delete lines 1 and 2. Never modify line 0. SYS4102,X with X between 1...

how do you print the code of the the prg files There's the petcat utility bundled with VICE, which converts *.prg to ASCII *.txt and vice versa. It has some weaknesses though, because graphic characters with the C= key are quoted as hex-codes only. Alternatively (again using VICE) the file is loade...

KingTrode wrote:[...] it does need some sound FX [...] Probably "Dice Throw" / "Invalid Selection" / "Succesful Score " or something along those lines.

Oh, I thought you'd add some speech synthesis if you were going to use expanded memory.

I already sent it to Nigel as e-mail, together with an explanation how the exploit works.

Here's my ultimate-rule-bending entry: 'bird.prg'.

Kweepa's program could go into a single line, BTW.

I'm sorry, but I wouldn't want an automated script to change my posts. Furthermore, I suppose you couldn't guarantee that any *.prg file runs without hassles on your emulator. If you add the link manually in an own follow-up post, that's fine and indicates you checked it at least. But if such an aut...

Okay then, the +3K RAM expansion just moves the BASIC start from $1001 down to $0401, but leaves screen memory and colour RAM at the same place as in the unexpanded configuration. Most BASIC programs written for the unexpanded VIC-20, even those that use redefined characters, run without any issues ...

Indeed, the form: IF <condition_1> THEN IF <condition_2> THEN ... instead of: IF <condition_1> AND <condition_2> THEN ... is quite often found in BASIC programs, and is easily generalised for more conditions. Note however these are only equivalent, when all conditionals are Boolean expressions. If y...

Mayhem wrote:+3K RAM provides its own problems, [...]

What kind of problems?

Are the "and" and "or" operators short-circuited in basic v2? No, they aren't. Expressions are always evaluated in full. Furthermore, AND, OR and NOT operate on signed 16-bit quantities. The result of a relational operator ('=', '<', '>' or any combination thereof) is -1 if the ...