Search found 8773 matches

by lidnariq
Fri Dec 06, 2019 3:18 pm
Forum: Other Retro Dev
Topic: R.O.B. Firmware
Replies: 22
Views: 792

Re: R.O.B. Firmware

The motors seem to be just motors? Not stepping motors? With a stepping motor one could do 100 steps, and would then know the exact position. With a normal motor one can just do something like running the motor for 100ms, and hope for the best. Yes, they're just cheap brushed DC motors with plastic...
by lidnariq
Fri Dec 06, 2019 2:24 pm
Forum: NES Hardware and Flash Equipment
Topic: 4in1 multicart
Replies: 5
Views: 99

Re: 4in1 multicart

... The missing IC is a 74'157. If populated, and the two traces on the back cut, it changes the geometry to instead be one 256/256 and two 128/128 games. (in that order) Theoretically pin 15 should be explicitly grounded in order for the '157 to work, but I don't see that, so it may not be function...
by lidnariq
Fri Dec 06, 2019 2:04 pm
Forum: NES Hardware and Flash Equipment
Topic: 4in1 multicart
Replies: 5
Views: 99

Re: 4in1 multicart

uh... pin 1 = Q1 (input) pin 2 = MMC3 PRG A17 (input) pin 3 = Q0 (input) pin 4 = PRG ROM A17 (output) pin 5 = MMC3 CHR A17 (input) pin 6 = Q0 (input) pin 7 = CHR ROM A17 (output) pin 8 = ground pin 16 = +5V pin 9-15 - floating I don't recognize that. It's not any standard 2-, 3-, or 4-input logic ga...
by lidnariq
Fri Dec 06, 2019 1:46 pm
Forum: NES Hardware and Flash Equipment
Topic: Rewriting a VT03 Famiclone's Flash Memory Chip
Replies: 11
Views: 3408

Re: Rewriting a VT03 Famiclone's Flash Memory Chip

Would you be willing to describe the restrictions on what the program can work with? All I see is an interface to choose one of 4 VRT machines, and and the ability to add ROMs to it, before it generates an image to be flashed to the SPI flash.
by lidnariq
Fri Dec 06, 2019 1:40 pm
Forum: NES Hardware and Flash Equipment
Topic: 4in1 multicart
Replies: 5
Views: 99

Re: 4in1 multicart

PCB says "K-3043" on the back. 74'161 latches A0-A3 74'161 cleared on reset. 74'161 clocked by MMC3 clone /WRAMCE 74'161 latch enable is MMC3 clone /WRAMWE 74'161 Q0 goes to both ROM A17. 74'161 Q1 goes to both ROM A18. 74'161 Q2 and Q3 not obviously connected to anything. This is almost oversize ma...
by lidnariq
Fri Dec 06, 2019 1:10 pm
Forum: NES Hardware and Flash Equipment
Topic: RAMBO-1 Mapper Investigation
Replies: 38
Views: 589

Re: RAMBO-1 Mapper Investigation

I have made a cheap-looking diagram to indicate my understanding of the timings. Is this correct? Yes, as far as I can tell. I mean, there's extra details about how there are actually 12 different M2 alignments here (three each at pixel quanta, which shifts from scanline to scanline, and four each ...
by lidnariq
Fri Dec 06, 2019 12:12 pm
Forum: NES Hardware and Flash Equipment
Topic: RAMBO-1 Mapper Investigation
Replies: 38
Views: 589

Re: RAMBO-1 Mapper Investigation

If the edges of PA12 don't matter, only the state, then it becomes vital to understand in a real PPU environment how long PA12 stays high during a scanline, and whether or how the random CPU-PPU clock alignment comes into play here. One would need to construct a scanline-wide (with ellipses for mos...
by lidnariq
Fri Dec 06, 2019 10:59 am
Forum: NES Hardware and Flash Equipment
Topic: Mapper52 Schematic diagram
Replies: 1
Views: 57

Re: Mapper52 Schematic diagram

I think everything you want is linked to from FARID's thread here
by lidnariq
Thu Dec 05, 2019 7:26 pm
Forum: NESdev
Topic: MMC3 ROM Disassembly?
Replies: 2
Views: 75

Re: MMC3 ROM Disassembly?

In my experience, clever-disasm can handle MMC3, but the process involves providing some guidance via an INI file ("there's a jump table here", "this is a datadata table", "this is the bankswitching routine", and so on. Exactly how much depends on how many places the code does things that are harder...
by lidnariq
Thu Dec 05, 2019 5:06 pm
Forum: NES Hardware and Flash Equipment
Topic: RAMBO-1 Mapper Investigation
Replies: 38
Views: 589

Re: RAMBO-1 Mapper Investigation

What is the behavior when a target/reload value of $00/$FF is written? Fire IRQ all the time (MMC3-C), once (MMC3-A), never? The value stored in $C000, +1, is the number of scanline detections to generate IRQ. For example, if $C000 = $04, the 5th scanline detected generates the IRQ. Works nicely as...
by lidnariq
Thu Dec 05, 2019 3:21 pm
Forum: NES Hardware and Flash Equipment
Topic: I guess I kinda screwed up my NESRGB mod
Replies: 2
Views: 75

Re: I guess I kinda screwed up my NESRGB mod

Do you get any difference in behavior by switching the palette to "pass-through" ?
by lidnariq
Wed Dec 04, 2019 6:49 pm
Forum: NES Hardware and Flash Equipment
Topic: Newbie needing some help. Strange problems with NES installed with Flashing Light Win from ArcadeWorks
Replies: 19
Views: 560

Re: Newbie needing some help. Strange problems with NES installed with Flashing Light Win from ArcadeWorks

Something shorted +5V to ground. (That's the only thing that can cause that symptom.)

I suppose you could see how cleanly the card edge connector lines up.
by lidnariq
Wed Dec 04, 2019 5:30 pm
Forum: NES Hardware and Flash Equipment
Topic: Newbie needing some help. Strange problems with NES installed with Flashing Light Win from ArcadeWorks
Replies: 19
Views: 560

Re: Newbie needing some help. Strange problems with NES installed with Flashing Light Win from ArcadeWorks

I'm sorry, I really literally can't think of any reason that only one MHROM game would work but a random NROM game wouldn't.

I'd throw a logic analyzer or oscilloscope at it and hope I found something going wrong digitally.


.... well, ok, maybe I'd try replacing the CPU's RAM on the mainboard.
by lidnariq
Wed Dec 04, 2019 11:05 am
Forum: SNESdev
Topic: New Super Mario Land
Replies: 9
Views: 1140

Re: New Super Mario Land

My main problem that I have with the game is the lack of polish. Sure it's kind of fun to play this, but Mario's jump mechanic needs some fine tuning. ... have you replayed the original Super Mario Land any time recently? It doesn't handle very nicely. I mean, you can argue that they should have ch...
by lidnariq
Tue Dec 03, 2019 5:11 pm
Forum: NES Hardware and Flash Equipment
Topic: RAMBO-1 Mapper Investigation
Replies: 38
Views: 589

Re: RAMBO-1 Mapper Investigation

Is it consistent with the ÷4 prescaler only getting cleared by writing to $E001 ?