Search found 11427 matches

by lidnariq
Tue Mar 19, 2024 1:20 am
Forum: NESdev
Topic: Vs. System Palette Implementation?
Replies: 1
Views: 101

Re: Vs. System Palette Implementation?

First off, this article mentions the 2C04 palette for SMB under the -0004 heading, but I'm unsure whether this means PlayChoice-10 SMB or Vs. SMB (or both?) 2C04 were only used with Vs. System. For the jumbled palettes, is it known exactly how those are mapped inside the PPU variants themselves, wh...
by lidnariq
Thu Mar 14, 2024 1:36 am
Forum: Other Retro Dev
Topic: How many color on some retro console
Replies: 7
Views: 659

Re: How many color on some retro console

Drag wrote: Wed Mar 13, 2024 9:35 pmOr, expanding a CGA monitor to full 2-bit RGB instead of the predefined CGA palette.
heh, getting nerdsniped ... this fantasy CGA palette would be 4 levels R and B, but 5 levels G. https://int10h.org/blog/2022/06/ibm-515 ... a-palette/
by lidnariq
Tue Mar 12, 2024 3:34 am
Forum: NES Hardware and Flash Equipment
Topic: Strange multicart
Replies: 4
Views: 398

Re: Strange multicart

Is it correct to assume there are no better photos? I think I can make out a "161" on one of the two, and the other is wired in a way that implies it's a 74'153 wired as two one-of-two multiplexers. I wouldn't be surprised if A0,A1,D0,D1 are latched on writes to MMC3 PRG RAM and multiplexe...
by lidnariq
Sun Mar 10, 2024 6:41 am
Forum: Reproduction
Topic: Acclaim 51555 PCB compatibility
Replies: 31
Views: 17962

Re: Acclaim 51555 PCB compatibility

Well, it confirms they're real pins - they're wire-bonded to something inside. My only guess is that they might be for cart RAM?
by lidnariq
Sat Mar 09, 2024 1:32 am
Forum: NES Hardware and Flash Equipment
Topic: Boot Up delay solution to prevent slowly configuration from FPGA.
Replies: 6
Views: 449

Re: Boot Up delay solution to prevent slowly configuration from FPGA.

Tragically, there is no great way to handle this.

The least bad option we've come up with is to stuff the CPU's data bus with an endless stream of $4C or $6C, which will keep the CPU doing something safe until the FPGA can take over (and recover from this)
by lidnariq
Sat Mar 09, 2024 1:27 am
Forum: Reproduction
Topic: Acclaim 51555 PCB compatibility
Replies: 31
Views: 17962

Re: Acclaim 51555 PCB compatibility

1. I'll take out the MC-AC mapper. 2. I'll set my multimeter to "diode" mode 3. I'll put the positive lead to the +5V (pin40) and the negative to pinX (6, 7 or 8), write down the result 4. I'll put the positive lead to pinX (6, 7 or 8) and the negative to GROUND (pin1), write down the res...
by lidnariq
Thu Mar 07, 2024 9:04 am
Forum: Reproduction
Topic: Acclaim 51555 PCB compatibility
Replies: 31
Views: 17962

Re: Acclaim 51555 PCB compatibility

Thank you for coming back to this!

Since you've got it socketed, can you check if there are body diodes on pins 6-8? Using a diode tester, check for a diode from ground to pin 6-8, and from pin 6-8 to +5v.
by lidnariq
Mon Mar 04, 2024 7:22 am
Forum: Other Retro Dev
Topic: WSdev WonderSwan Wiki
Replies: 13
Views: 2241

Re: WSdev WonderSwan Wiki

The WSC and SC both give the exact same external symptom (namely: screen flickers on then instantly turns off) for any kind of authentication failure. This can be "the ROM didn't have the right bytes at the right place", or the 18-bit magic number wasn't presented on the MBC pin, or a hard...
by lidnariq
Sun Mar 03, 2024 5:15 am
Forum: NES Hardware and Flash Equipment
Topic: AUX on the Yobo Gameware FC2
Replies: 7
Views: 481

Re: AUX on the Yobo Gameware FC2

Perhaps the two D+ and D- pins on the USB connector are composite video and audio in?

If you're willing to take a picture of the inside we might be able to make an informed guess.
by lidnariq
Thu Feb 29, 2024 3:02 am
Forum: NES Hardware and Flash Equipment
Topic: NES Peritel cable in scart port doesn't show properly on my TV
Replies: 5
Views: 342

Re: NES Peritel cable in scart port doesn't show properly on my TV

Hm, my memory is that the BIOS menu (CD player and save card manager) is also properly interlaced.
by lidnariq
Wed Feb 28, 2024 4:33 am
Forum: NES Hardware and Flash Equipment
Topic: NES Peritel cable in scart port doesn't show properly on my TV
Replies: 5
Views: 342

Re: NES Peritel cable in scart port doesn't show properly on my TV

The same happens for my old PS1, so the problem is definitely my TVs I guess. The PS1 boot animation (the Sony and PlayStation logos) is proper interlaced video. If the same bug happens there, this is a profound flaw in your TV that will break most uses of the composite input. If it does, and your ...
by lidnariq
Fri Feb 23, 2024 1:39 am
Forum: NESdev
Topic: Single Chip Cartridge
Replies: 133
Views: 100132

Re: Single Chip Cartridge

Thirdly, you need logic level converters for all the PPU lines, because according to lidnariq they're all nominally 5V unlike the CPU lines that are around 4V. PPU A13-A8 should be 4V; PPU /RD and /WR should be 4V. You're right that PPU A7-A0, D7-D0, /A13 should all be "real" 5V. Then you...
by lidnariq
Fri Feb 23, 2024 1:31 am
Forum: NES Hardware and Flash Equipment
Topic: Weird 15 in 1 Cartridge
Replies: 13
Views: 922

Re: Weird 15 in 1 Cartridge

Several things missing...

no output onto 74'257 pin 3 / 74'02 pin 12 - probably CPU A14
no input into CHR ROM A13 - probably 74'161 pin 14.

Looks like it's 14 16KiB NROM games plus one 32KiB. If [value in latch] is 1, then it's 32KiB, otherwise it's 16KiB.
by lidnariq
Fri Feb 23, 2024 1:05 am
Forum: SNESdev
Topic: snes assembly - beginnings, a few questions (wla-65816)
Replies: 104
Views: 8142

Re: snes assembly - beginnings, a few questions (wla-65816)

It's new to me, at least. I just called it the "decompressed Star Ocean map"
by lidnariq
Thu Feb 22, 2024 11:16 am
Forum: NESdev
Topic: Running mapper 206 as MMC3
Replies: 8
Views: 476

Re: Running mapper 206 as MMC3

On the mapper 206 page, the bit you quoted is followed by a vitally important bit: will usually work if emulated with MMC3, and the mirroring is correct Some emulators will take the state of the nametable layout bit in the header and use it to specify the power-on state for mappers with the ability ...