nesdev.org

Are there any problems using homemade rom carts on these new Famicom (Yobo) systems?

Do I have to disable the lock-out chip if using a cart that has one?

Thanks,
T

I've been using a Super Mario Bros. cart for testing my own roms on the NES. I was wondering what other original carts can be used for this purpose?

Thanks again,
T

I see.

Thank you.

T

Ok I see. Thanks for the info.

T

I was wondering if it's possible to play NES carts in the new Famicom systems made by Yobo?

Is there any other new system that will play the old NES carts?

Thanks,
T

Would the NES Advantage Joystck require special programming for it to work with a homemade rom?

I'll need to read $4016 and $4017?

Thanks,
T

Update: I just learned the Advantage plugs into both controller ports. I thought it only plugged into one controller port, so was a little confused.

Thanks.

I am reading the doc and from what I can gather square wave 1 (& 2) have this same volume decay loop at the same bit positions?

Square 1 Channel

$4000.5 ;set bit 5 to enable volume decay looping

disable at $4000.4 ; set bit 4 to disable volume decay looping

Thanks,
T

Thanks very much. Will study your reply some more and re-post. I was (am) having trouble fully understanding the docs, I did try to use them before posting. Your explanation cleared it all up for me, at least concerning the noise channel and it's volume decay loop. (I should have posted 2 days ago!)...

I am experimenting with the noise channel and writing to it's registers. So we have: $400C $400E $400F I noticed that if bit #5 is set in register $400C you can get a looping effect. I am now trying to figure out of to adjust the loop time, speed it up, slow it down. I think this loop timing is cont...

Thanks. (Sorry, I could have been more specific). I am referring to the 800xl, 600xl, home computers, and about the hardware process of burning a rom onto a chip. I've been messing around with burning NES roms and was wondering if that process is the same for burning Atari roms. Yes, the Lynx looks ...

Hi,

I was wondering if anyone here has done any programming with the Atari 8 Bit machines.

If so, is the process for creating a cart the same as it is for the NES?

Thanks,
T

Thanks. What about this: ;Check if A and B are pressed LDA button_state AND #$03 ; mask out A+B bits CMP #$03 ; see if it equals A+B BNE ab_not_pressed jsr ab_is_pressed ab_not_pressed: The code above works in nintendulator. When I did this (below) previously, it also worked in nintendulator but not...

Yeah, I see what you guys are saying now... Thanks for the help. I was experimenting with detecting 2 simultaneous button presses, so I did this: ab_pressed EQU %00000011 ; a and b button press ;Check if A and B are pressed lda button_state cmp #ab_pressed bne ab_not_pressed jsr ab_is_pressed ab_not...

I understand what you're saying about $40 = no press and $41 = press. But in the original code that I'm referring to earlier in this thread we did this before masking the bits: updatejoy: LDA #1 ; first, strobe the joypad STA $4016 LDA #0 STA $4016 LDX #$08 ; set X to 8 (the number of times we want ...

Difference between using AND and CMP. I noticed that this: ;Check the state of the right key lda button_state cmp #key_right ; compare bne right_not_pressed ; branch if not equal to zero jsr right_is_pressed right_not_pressed: Does the same thing that this did; ;Check the state of the right key lda ...