Search found 11429 matches
Re: Vortex
No, the exact opposite. It uses more than half of the memory it has, and needs twice that.
- Fri Mar 22, 2024 5:55 am
- Forum: Other Retro Dev
- Topic: How many color on some retro console
- Replies: 11
- Views: 1049
Re: How many color on some retro console
On the GBC, like on the SMS, the "transparent" color is per palette. Color 0 is both "transparent" - sprite pixels are always shown in preference - but also not global.
- Tue Mar 19, 2024 1:20 am
- Forum: NESdev
- Topic: Vs. System Palette Implementation?
- Replies: 3
- Views: 371
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...
- Thu Mar 14, 2024 1:36 am
- Forum: Other Retro Dev
- Topic: How many color on some retro console
- Replies: 11
- Views: 1049
Re: How many color on some retro console
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/
- Tue Mar 12, 2024 3:34 am
- Forum: NES Hardware and Flash Equipment
- Topic: Strange multicart
- Replies: 4
- Views: 443
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...
- Sun Mar 10, 2024 6:41 am
- Forum: Reproduction
- Topic: Acclaim 51555 PCB compatibility
- Replies: 31
- Views: 18141
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?
- 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: 493
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)
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)
- Sat Mar 09, 2024 1:27 am
- Forum: Reproduction
- Topic: Acclaim 51555 PCB compatibility
- Replies: 31
- Views: 18141
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...
- Thu Mar 07, 2024 9:04 am
- Forum: Reproduction
- Topic: Acclaim 51555 PCB compatibility
- Replies: 31
- Views: 18141
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.
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.
- Mon Mar 04, 2024 7:22 am
- Forum: Other Retro Dev
- Topic: WSdev WonderSwan Wiki
- Replies: 13
- Views: 2373
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...
- Sun Mar 03, 2024 5:15 am
- Forum: NES Hardware and Flash Equipment
- Topic: AUX on the Yobo Gameware FC2
- Replies: 7
- Views: 530
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.
If you're willing to take a picture of the inside we might be able to make an informed guess.
- 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: 379
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.
- 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: 379
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 ...
- Fri Feb 23, 2024 1:39 am
- Forum: NESdev
- Topic: Single Chip Cartridge
- Replies: 133
- Views: 100605
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...
- Fri Feb 23, 2024 1:31 am
- Forum: NES Hardware and Flash Equipment
- Topic: Weird 15 in 1 Cartridge
- Replies: 13
- Views: 988
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.
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.