Search found 1665 matches

by kyuusaku
Tue Oct 30, 2012 4:05 pm
Forum: NESemdev
Topic: FDS mechanical timings
Replies: 5
Views: 2223

Re: FDS mechanical timings

The drive's motor speed is adjustable so every drive is different. Once you insert a disk it takes less than 2 seconds for the motor to spin up/for the head to return to the center of the disk, the return mechanism is part of the motor's scan. If the motor was stopped in the middle of the last pass,...
by kyuusaku
Sat Oct 13, 2012 3:04 pm
Forum: NES Hardware and Flash Equipment
Topic: NES/Famicom board - just an idea
Replies: 4
Views: 1454

Re: NES/Famicom board - just an idea

The main issue is that NES and FC have different board thicknesses, so to do it properly one slot would require a separate PCB that is secured to the main one. Not a big deal for expensive development items, but for cheap game production, if customers have only one system the increased cost from two...
by kyuusaku
Fri Sep 28, 2012 11:15 am
Forum: NESdev
Topic: Single Chip Cartridge
Replies: 97
Views: 63964

Re: Single Chip Cartridge

NROM and the PA10/PA11 variant of this poor man's OneBus is 1. the CHR holes are unpopulated and 2. CIRAM /CE is grounded. That's why I favor making the PA10/PA11 variant a variant of #0 distinguished by NES 2.0's CHR RAM size field being 0. 3. VRAM A10 is connected to PA13. (Unless you *want* two ...
by kyuusaku
Thu Sep 27, 2012 9:32 pm
Forum: NESdev
Topic: Single Chip Cartridge
Replies: 97
Views: 63964

Re: Single Chip Cartridge

Don'cha think this discussion is getting a little heated for what it is?
zzo38 wrote:Read above my edited message how I implemented this mapper 218 in FamicomHDL
Y U NO STOP PLUGGING EVERY POST? NOBODY REPLYING
by kyuusaku
Thu Sep 27, 2012 12:33 am
Forum: NESdev
Topic: Single Chip Cartridge
Replies: 97
Views: 63964

Re: Single Chip Cartridge

See the Atari 2600 Harmony cartridge, it's just a 70 MHz ARM7TMDI (<70 MIPs). The NES is 50% faster than the 2600, but still it shows that it's very feasible; the 2600 doesn't even give you a clock or *any* control signal to synchronize with. Selecting a MCU with a slave parallel port will help. Als...
by kyuusaku
Sat Sep 22, 2012 3:18 pm
Forum: NESdev
Topic: No-Intro NES/Famicom databasing community.
Replies: 23
Views: 9854

Re: No-Intro NES/Famicom databasing community.

Mirroring should have been part of the mapper (SRAM too). We'd maybe have 10 more mappers, but a cleaner format.
by kyuusaku
Fri Sep 21, 2012 6:25 pm
Forum: NESemdev
Topic: DotFami
Replies: 21
Views: 5436

Re: DotFami

If a generic container i sused, something like ZIP would probably be better since it can contain binary data. I mean a container for the metadata. Zip can contain the binary and metadata, but XML (or JSON/whatever) are forever extensible, and can hold all your metadata types that you have set for s...
by kyuusaku
Fri Sep 21, 2012 3:18 pm
Forum: NESemdev
Topic: DotFami
Replies: 21
Views: 5436

Re: DotFami

The ROM is binary but everything else is metadata, and since you have SO MUCH metadata, it's time to use a generic container. Using a generic container will mean that controversial areas of your specification can be safely ignored. Personally I don't even understand why your format handles iNES and ...
by kyuusaku
Thu Sep 20, 2012 12:17 pm
Forum: NESemdev
Topic: DotFami
Replies: 21
Views: 5436

Re: DotFami

Since you want the format to define everything under the sun, how is this format better than any XML format which is actually extensible, and emulators can support as little or as much of the crap bundled with the ROM as they want? Sure your format encompasses a lot (whether this is good is debatabl...
by kyuusaku
Fri Sep 14, 2012 2:03 pm
Forum: SNESdev
Topic: SNES hardware clones
Replies: 4
Views: 2285

Re: SNES hardware clones

The SNES is made of static CMOS logic, the NES is made of dynamic NMOS logic. I think they just did a better job with the SNES lithography, which as static logic is probably less process critical. There's also the issue of external wiring which is simpler on the SNES. Lastly AFAIK there's only one s...
by kyuusaku
Thu Sep 13, 2012 2:51 pm
Forum: NES Hardware and Flash Equipment
Topic: iNES 48 / J9100287A / TAITO-TC0190FMC+PAL16R4
Replies: 12
Views: 4269

Re: iNES 48 / J9100287A / TAITO-TC0190FMC+PAL16R4

:/ Once again there's no IRQ/BRK wizardry going on, the game doesn't use IRQs... The games that do use the other ASIC.
by kyuusaku
Wed Sep 12, 2012 12:34 pm
Forum: SNESdev
Topic: Broken "Illusion of Time" cartridge fixable?
Replies: 16
Views: 4983

Re: Broken "Illusion of Time" cartridge fixable?

That corrosion is worrisome. Does it look like someone spilled a drink on the cart? I hope the flux isn't the culprit.
by kyuusaku
Mon Sep 10, 2012 10:33 am
Forum: SNESdev
Topic: Mode 20 vs. Mode 21 (aka LoROM vs. HiROM)
Replies: 21
Views: 5201

Re: LoROM vs. HiROM

byuu, you're such a programmer ;) I kind of consider what has been said incomplete and overcomplicated; technically LoROM can straightforwardly map up to 63.5 Mbits. Heres my explanation: LoROM / Mode 20: 00-FF:8000-FFFF (except for the two RAM banks where /ROMSEL isn't asserted), mirrored into 0000...
by kyuusaku
Wed Aug 08, 2012 12:48 am
Forum: NES Hardware and Flash Equipment
Topic: Breaking NES apart (WARNING: traffic)
Replies: 20
Views: 15021

Re: Breaking NES apart (WARNING: traffic)

Ahh, I thought you were working only from the die photo... Still impressive!

I took the easy way out and extracted the node and transistor list.
by kyuusaku
Tue Aug 07, 2012 5:37 pm
Forum: NES Hardware and Flash Equipment
Topic: Breaking NES apart (WARNING: traffic)
Replies: 20
Views: 15021

Re: Breaking NES apart (WARNING: traffic)

I seriously need to work on my skills... How do you determine anything from the plain layered die photo? Is image processing being employed? (Or are you actually compositing the layers?)