Search found 592 matches

by Ben Boldt
Thu Sep 24, 2020 4:56 pm
Forum: NES Hardware and Flash Equipment
Topic: Interesting pirate PCB
Replies: 10
Views: 399

Re: Interesting pirate PCB

not really, some kinds of MCP have 2 dies inside, and the highest address actually is the driving pin of CS. the CS pin's input delay is much larger than other address pins', had better use for the highest address control(ram banking), not suitable for the lower address pins(random accessing) That ...
by Ben Boldt
Wed Sep 23, 2020 2:38 pm
Forum: NES Hardware and Flash Equipment
Topic: Interesting pirate PCB
Replies: 10
Views: 399

Re: Interesting pirate PCB

Do you know, with SRAM, you can put address lines and data lines in any order? :) ALWAYS you see special routing to keep them correct, nobody must realize it.
by Ben Boldt
Wed Sep 23, 2020 11:23 am
Forum: NES Hardware and Flash Equipment
Topic: Weird famiclone with infrared controllers
Replies: 49
Views: 8932

Re: Weird famiclone with infrared controllers

Oh wow, that's great! I didn't have very high hopes because I had not heard of an IR receiver ever going bad before. Maybe it was the capacitors somehow too but anyway thanks for letting us know it worked out.
by Ben Boldt
Sun Sep 20, 2020 4:23 pm
Forum: NES Music
Topic: VRC7/YM2413/OPLL Custom Patches
Replies: 18
Views: 612

Re: VRC7/YM2413/OPLL Custom Patches

Thanks for your help explaining lidnariq. I was looking at the wikipedia article actually. As soon as I see a control loop diagram I know from experience not to trust that I have clue what I am looking at. (Or that the person who drew it did either in most cases, lol). The way you explain it makes a...
by Ben Boldt
Sun Sep 20, 2020 11:41 am
Forum: NES Music
Topic: VRC7/YM2413/OPLL Custom Patches
Replies: 18
Views: 612

Re: VRC7/YM2413/OPLL Custom Patches

This PDM stuff is pretty interesting but it is hard to wrap my head around the concept. From what I understand, when you put out 1-bit DAC pulses, if the DAC is high, it increases the resulting analog voltage, low it decreases, both at a defined rate, which differs from poor man's DAC because in tha...
by Ben Boldt
Sat Sep 19, 2020 12:00 pm
Forum: NES Music
Topic: VRC7/YM2413/OPLL Custom Patches
Replies: 18
Views: 612

Re: VRC7/YM2413/OPLL Custom Patches

Wow, I have never heard of delta-sigma DAC, either that or I forgot it completely. I have been reading up on it now. It looks like it is basically implementing a poor-man's PWM again but this time with known slopes and a feedback loop. I am wondering if there is a way to mitigate overhead in the mic...
by Ben Boldt
Sat Sep 19, 2020 10:31 am
Forum: NES Music
Topic: VRC7/YM2413/OPLL Custom Patches
Replies: 18
Views: 612

Re: VRC7/YM2413/OPLL Custom Patches

Okay cool, thanks for the info. I am kind of playing with VRC7 lately and tossing around ideas, etc. I have been working on hacking Tetris to run on VRC7 and play FM music and making some progress on that. Not ready yet to commit to completing it but just having fun for the most part. https://youtu....
by Ben Boldt
Thu Sep 17, 2020 5:59 am
Forum: NES Music
Topic: VRC7/YM2413/OPLL Custom Patches
Replies: 18
Views: 612

Re: VRC7/YM2413/OPLL Custom Patches

I think for standard OPLL you might be able to get "official" names off a Casio keyboard that uses it, perhaps? (Though, even there I think the named instruments tend to be custom ones. The built-in ones might only show up anonymously in accompaniment patterns.) As far as I knew from Wikipedia, onl...
by Ben Boldt
Wed Sep 16, 2020 9:02 pm
Forum: NES Music
Topic: VRC7/YM2413/OPLL Custom Patches
Replies: 18
Views: 612

Re: VRC7/YM2413/OPLL Custom Patches

Okay thanks for the advice. I do still have that PSS-140 stored away. If I can get ahold of it again some day I will sniff out its 100 patches for us with my oscilloscope. Kind of a side-question, some time ago I put names of the instruments into our VRC7 audio wiki page, based on a forum post from ...
by Ben Boldt
Sun Sep 13, 2020 3:55 pm
Forum: NES Music
Topic: VRC7/YM2413/OPLL Custom Patches
Replies: 18
Views: 612

VRC7/YM2413/OPLL Custom Patches

I have been playing with some VRC7 stuff and just started poking at the custom patch. I know the built-in patches of the VRC7 and YM2413 from the siliconpr0n website: VRC7: | 00 01 02 03 04 05 06 07 | Name ---+-------------------------+---------------- 0 | -- -- -- -- -- -- -- -- | (Custom Patch) 1 ...
by Ben Boldt
Wed Sep 09, 2020 10:05 am
Forum: NES Hardware and Flash Equipment
Topic: Weird famiclone with infrared controllers
Replies: 49
Views: 8932

Re: Weird famiclone with infrared controllers

I retried the 2 tests on test 2 and the one test the light stays on and the other test there is no light (looks like I had got mixed up and done the same test twice) Silly me What's odd is when the console is switched on from cold, it sometimes it lets you play for a little while with limited contr...
by Ben Boldt
Tue Sep 08, 2020 11:39 am
Forum: NES Hardware and Flash Equipment
Topic: Weird famiclone with infrared controllers
Replies: 49
Views: 8932

Re: Weird famiclone with infrared controllers

Test 2 Light stays on (On both tests) That sounds worrying, and it's normally not possible at all, LEDs should light up only one way around. One explanation would be that you have repeated the same test twice, without swapping the pins. I think this is the most likely case because the Famicom opera...
by Ben Boldt
Mon Sep 07, 2020 11:22 am
Forum: NES Hardware and Flash Equipment
Topic: Weird famiclone with infrared controllers
Replies: 49
Views: 8932

Re: Weird famiclone with infrared controllers

I have not heard of http://www.buy-transistors.com before... It looks like they take PayPal, so that would be a safer route, but just be really careful, make sure you are on paypal's site in the URL before entering any username/password/etc. It would be a pretty safe bet that the part would be compa...
by Ben Boldt
Mon Sep 07, 2020 10:59 am
Forum: NES Hardware and Flash Equipment
Topic: Weird famiclone with infrared controllers
Replies: 49
Views: 8932

Re: Weird famiclone with infrared controllers

The resistor missing on your circuit board is probably normal. It sure sounds like a bad IR receiver based on test 3. To be sure, you should use your camera again to look at the controller's LED and the new red LED in test 3 at the same time (both in the same shot with your camera). If you can verif...
by Ben Boldt
Sat Sep 05, 2020 6:19 pm
Forum: NES Hardware and Flash Equipment
Topic: 3193 vs 3193A chip?
Replies: 5
Views: 718

Re: 3193 vs 3193A chip?

Thanks for telling us you got it working.