[EDIT solved] Homemade NES Homemade. hairy defect

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darleiv
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Joined: Wed Feb 23, 2022 10:55 pm

[EDIT solved] Homemade NES Homemade. hairy defect

Post by darleiv »

[EDIT] solved
but I found that there are other problems in the console that I designed related to the position of the pieces. clock position of buffers etc. this interferes with the proper functioning of the console. I will redesign it

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Oh people, everything is beautiful. I'm facing some very unusual and unusual problems. after I build a nes for me to play. I have some problems that are burning my neurons. Note that I turn on the game and the screen is locked. gets frozen. or you can enter a blank screen depending on the game

and I created a clock for testing with a 7404 using the phamtom system nes scheme. the clock that is on the board that would be the FC clock is not running despite being correct.

what have i done? I've already tested it piece by piece on another console. all good. I've already tested track by track to see any breakage. I did not find it.

when I turn on the console it already returns this frozen screen.
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Last edited by darleiv on Sun Jun 19, 2022 12:08 pm, edited 4 times in total.
darleiv
Posts: 69
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Re: Homemade NES Homemade. hairy defect

Post by darleiv »

clock on the board

schematic that I based myself to do
and photo of my schematic the one with purple strokes is my board
the other and dendy remastered

https://drive.google.com/file/d/18oLFkN ... sp=sharing

https://drive.google.com/file/d/1Y419B1 ... sp=sharing
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a2.png
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NES VERMELHO.png
lidnariq
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Re: Homemade NES Homemade. hairy defect

Post by lidnariq »

Hard to say exactly, but it looks like you're having IRQ problems... Check PPU A12 (to MMC3-using carts) and the /IRQ pin.
darleiv
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Re: Homemade NES Homemade. hairy defect

Post by darleiv »

lidnariq wrote: Thu Jun 16, 2022 8:21 am Hard to say exactly, but it looks like you're having IRQ problems... Check PPU A12 (to MMC3-using carts) and the /IRQ pin.
as it's giving an error I tied the irq to the B+ and the reset too to avoid problems in the test

note that the video game does not start it shows the screen of the mmc1 skate or die already locked and look there. most of the ones I tested from the white screen. mario gave this screen because I ground it with my finger on top of the cpu - before there was no image
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Ben Boldt
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Re: Homemade NES Homemade. hairy defect

Post by Ben Boldt »

I think that the clock must be working because you do get video output even when it is locked up. Is this a known-good CPU? (Maybe CPU is defective.)


Edit:
I've already tested it piece by piece on another console. all good.
Nevermind, I see this now.
darleiv
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Re: Homemade NES Homemade. hairy defect

Post by darleiv »

Ben Boldt wrote: Thu Jun 16, 2022 12:55 pm I think that the clock must be working because you do get video output even when it is locked up. Is this a known-good CPU? (Maybe CPU is defective.)


Edit:
I've already tested it piece by piece on another console. all good.
Nevermind, I see this now.
You know. when 1+1 is 2? but this problem does not follow this logic. the circuit has no error. everything is alright. when you turn it on it crashes. I think God and the devil are involved

what i suspect. the cpu is not starting or the ram. or the communication between ppu cpu. says one thing do you know if the NMI can put it on B+ for testing?

i tried a mario nrom nor image gave - i tried galaxian with 16k bank does not start. this isolating communication problem or inverted address

do you know any roms that check for errors on nes?

really this watch with 7404 it has a very long range. that I can get an image even with a defect. the common clock used I can't get such an image. I'm going to paste here the clock that I'm using external. 1 minute
clock1.png
neto_esquema_gradiente_phantom_system_ph-8.jpg
darleiv
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Re: Homemade NES Homemade. hairy defect

Post by darleiv »

I did some tests. nmi brk fail?
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Quietust
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Re: Homemade NES Homemade. hairy defect

Post by Quietust »

darleiv wrote: Fri Jun 17, 2022 10:46 am I did some tests. nmi brk fail?

287481621_381695023819153_4877789103913901460_n.jpg
Those results suggest that NMI never triggered at all, which might explain the problems you're seeing elsewhere - double-check that PPU pin 19 connects to CPU pin 33 and that there's a suitable pull-up resistor at either end.
Quietust, QMT Productions
P.S. If you don't get this note, let me know and I'll write you another.
darleiv
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Re: Homemade NES Homemade. hairy defect

Post by darleiv »

Quietust wrote: Fri Jun 17, 2022 11:01 am
darleiv wrote: Fri Jun 17, 2022 10:46 am I did some tests. nmi brk fail?

287481621_381695023819153_4877789103913901460_n.jpg
Those results suggest that NMI never triggered at all, which might explain the problems you're seeing elsewhere - double-check that PPU pin 19 connects to CPU pin 33 and that there's a suitable pull-up resistor at either end.
it was the nmi itself. it was grounded after I disconnected and redoing the track worked but now some games the p1 control works, others just go up kkk =(
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