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I built this eprom cart to be able to play rare games on my atari2600. EP-rom stands for erasable programmable rom, so I can burn games onto it





Edit: Now with 128k RAM instead of rom! Can hold 16 games!

I modded my atari2600 so that you can use the second joystick as a select and reset switch.

It's a really cheap mod and not very complicated. If you don't want to drill holes in your atari2600 you can just lead the wires out of the back of the console and have an external switch.
I came up with this while playing asteriods. I used an extention cable to be able to play from the couch, but every time I died I had to walk up to the console and reset it. You can turn the mod on and off with a switch, so you can still play with two players, but then the loser has to reset it :-D

I just mastered the famous Reset Glitch and I found out something really cool: The gamedesigners hid some anti-cheat mechanisms in Super Metroid. It's up to us gamers to find them all! I will be doing a series of video's on the anti-cheat systems and some more cool tricks you can do will all items! (pwning crocomire with the grappling beam for instance)

First video:

Have you ever wanted to scale up a sprite? Use this AXE subroutine:
Lbl SPR
For(A,0,7
{r5+A}->r6
For(B,0,7
If r6^2
Rect(B*r3+r1,A*r4+r2,r3,r4
End
r6/2->r6
End
End
Now use this code to call the subroutine:
SPR(x,y,w,h,pic
It uses rectangles of size w,h to display the sprite. I guess this code can be optimized, but it does the job.

For example:
.SPRITESC
[3C42A581A599423C]->Pic1
ClrDraw
For(A,2,10
SPR(5,5,C,C/2,Pic1
Pause 300
DispGraphClrDraw
End
Pause 1000
Return
Lbl SPR
For(A,0,7
{r5+A}->r6
For(B,0,7
If r6^2
Rect(B*r3+r1,A*r4+r2,r3,r4
End
r6/2->r6
End
End

I hope you find this information helpful. Please leave suggestions and or questions.

TNT blocks in real life!


Do you want to see a how to make video?

EDIT: Bigger BOOM!!!

Hey guys! I'm working on a midiadapter for the TI 83 series calculators. The hardware is neary done (need a midi socket) I found this code on the arduino website:
void setup() {
  //  Set MIDI baud rate:
  Serial.begin(31250);
}

void loop() {
  // play notes from F#-0 (0x1E) to F#-5 (0x5A):
  for (int note = 0x1E; note < 0x5A; note ++) {
    //Note on channel 1 (0x90), some note value (note), middle velocity (0x45):
    noteOn(0x90, note, 0x45);
    delay(100);
    //Note on channel 1 (0x90), some note value (note), silent velocity (0x00):
    noteOn(0x90, note, 0x00); 
    delay(100);
  }
}

//  plays a MIDI note.  Doesn't check to see that
//  cmd is greater than 127, or that data values are  less than 127:
void noteOn(int cmd, int pitch, int velocity) {
  Serial.write(cmd);
  Serial.write(pitch);
  Serial.write(velocity);
}I wonder what the output of this code is (in binairy) so that I can write a midi routine in axe.