Search found 1033 matches

by Fisher
Sun May 24, 2020 1:16 pm
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

Found another weird thing. That 2 small lines glitch seems to be inherent from the Kaiser's hack. When the game is paused, the lines change colors and go a little to the right according to what buttons I press on the 1st controller. It looks like the same happens when the game isn't paused too. It's...
by Fisher
Sat May 23, 2020 5:56 pm
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

Finally I discoverd why the 74'74 wasn't switching! Got better, but still buggy: WhatsApp Image 2020-05-23 at 8.39.38 PM.jpeg The 74'74 was simply not receiving power!! :facepalm: The problem is that the MX8018-0002-A IC is gets GND on pins 7 and 14, while the VCC is on pin 13. I can't facepalm enou...
by Fisher
Sat May 23, 2020 7:03 am
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

Ok, probably it's something else. Since I'm on a laptop now, it's easier to post an updated schematics and some (unfourtunatelly blurry) pictures. 74LS00 ___ 74LS138 74LS74 PPU A11--| \ ___ +-------+ +------+ | O----| \ CPU A13-1|A0 |16---VCC---1|CLR Q|5----------|___/ | O---CIRAM A10 CPU A14-2|A1 O...
by Fisher
Fri May 22, 2020 6:43 pm
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

Well, I found an interesting thing... Looks like that the 74'74 isn't changing its outputs. Looking at the debugger during the race, the game seems to write #$2A to $C0FF at scanline 180, then do the same at scanline 140 and then repeats this every frame. AFAIK this should be changing the mirroring,...
by Fisher
Fri May 22, 2020 4:04 am
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

Did you read my post ? Yes I did, and forgot to thank you. :oops: I didn't switch the PPU pins but the output pins from the FF, I think this should give the same result. I think I should redraw that diagram, since I exchanged the 74'02 to a 74'00 and the 74'161 to a 74'175. This should make easier ...
by Fisher
Thu May 21, 2020 6:45 pm
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

Finally, after disassembling, I tested the ICs and confirmed they are all fine. I remounted the PCB, this time knowing all them were OK. Same problem! Rechecked the wiring dozens of times and all was like planned. Strangely the game booted fine when connected to a GameGenie! Not sure if the problem ...
by Fisher
Thu May 21, 2020 4:33 am
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

goodnes Highway Star (J) [hM02] ,You seem to have posted PCB on the wiki. Yeah, that was my first option, but I dropped it due to that "distracting" mirroring bug. I have to agree that hardware problems seem more likely right now? It's been a while I don't mess with debuggers, so I tried my "luck" ...
by Fisher
Wed May 20, 2020 8:13 pm
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

I had a little spare time this afternoon and got back to this. I mounted the 74'138, 74'175, 74'32, the CHR RAM and the 74'00. I used 1/4 of the 74'00 to invert CPU R/W and avoid bus conflicts. I've followed lidnariq's instructions, the game booted straight to the car select screen and locked there....
by Fisher
Wed May 20, 2020 6:07 am
Forum: SNESdev
Topic: SNES Clone
Replies: 9
Views: 572

Re: SNES Clone

Super Mario World uses the same effect in the last boss fight to show Bowser in front of Mario and the castle. Intertingly, I finished SMW and noticed no problems. That's weird!! IMG_2252.JPG Looking at this picture seems that the S-WRAM was exchanged by LH5P8128 IC, an SRAM. AFAIK the S-WRAM, amon...
by Fisher
Sun May 17, 2020 5:03 pm
Forum: SNESdev
Topic: SNES Clone
Replies: 9
Views: 572

Re: SNES Clone

Contra 3 That's interesting, I took some pictures of Contra 3: Stage 2: 20200516_175445.jpg Stage 2's Boss 20200516_175650.jpg Stage 5: 20200516_181244.jpg Stage5's Boss 20200516_181429.jpg Looks like the clone had many timing issues. Sunset Riders ramdomly crashes, Battlemaniacs started after a fe...
by Fisher
Sat May 16, 2020 1:06 pm
Forum: SNESdev
Topic: SNES Clone
Replies: 9
Views: 572

Re: SNES Clone

Thanks! That's great! :-) It's a 2/1/3 20200516_164045.jpg So far the only flaws I could identify is that it can't run SA-1 games. Possibly it can't run SDD-1 games too, but since I have no game with this special chip I can't confirm. Super Mario Kart ran fine, as Starfox, Yoshi's island and Rockman...
by Fisher
Sat May 16, 2020 8:12 am
Forum: SNESdev
Topic: SNES Clone
Replies: 9
Views: 572

SNES Clone

Hi. After many years of hearing about them, I finally could take a look at a SNES clone! Unfortunately, I'm in a hurry and won't stay with this clone for long, since the owner just asked me to test it and fix some minor issues. But I got some pictures or it on my Google Drive . If someone would like...
by Fisher
Mon May 11, 2020 2:04 pm
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

ignore /ROMSEL in the decoder and use A7 instead Thanks. Should I put A7 on the input pins or on one of the enable pins? To use it with the other board, I think I should insulate pin 3 and pull down pin 4 of the 74'138. On the 74'175 side I think I should insulate pins 2,7 and 10 pluging them on th...
by Fisher
Sun May 10, 2020 7:10 am
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

The back of the board even gives me some despair... LOL!! WhatsApp Image 2020-05-10 at 10.56.41 AM.jpeg The objective of doing this was to know if the logic would work. Since lindnariq confirmed it's correct, I think I should try the game on it's "definitive" board. The board I intend to use is from...
by Fisher
Sat May 09, 2020 6:43 pm
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 39
Views: 1953

Re: Help with Kaiser's Highway Star repro

lidnariq wrote:
Sat May 09, 2020 3:52 pm
If so, you could try adding a RC delay on M2 where it goes into the 74'138.
No luck either.
rat's nest
rat's nest
Could this rat's nest be the cause of such problems?