Search found 589 matches

by krzysiobal
Wed Nov 20, 2019 4:45 am
Forum: phpBB Issues
Topic: What happened to the Nesdev phpBB theme?!?!
Replies: 74
Views: 4553

Re: What happened to the Nesdev phpBB theme?!?!

Totally ugly, even the avatars of post's authors are on the right side. What a mess.
And why the "Submit" button changed its place from left to right also.
Can find 98 more reasons that old scheme needs to be reverted back
by krzysiobal
Mon Nov 18, 2019 12:37 am
Forum: NES Hardware and Flash Equipment
Topic: Timing properties of the 2A03's write cycles
Replies: 4
Views: 1097

Re: Timing properties of the 2A03's write cycles

So it seems that when the CPU writes to the PPU or any other peripheral, the wrong value is always on the data bus for a whole half dot. The surprising part is that everything isn't glitchy. That's why during write cycle all memory chips (RAM, ROM) latches internally the destination address on the ...
by krzysiobal
Wed Nov 06, 2019 1:25 pm
Forum: NES Hardware and Flash Equipment
Topic: Kaiser chips KS204/KS203/KS202 + kaiser boards
Replies: 14
Views: 5749

Re: Kaiser chips KS204/KS203/KS202 + kaiser boards

KS-018 PRG: ROM0 = 128kB MASK, upper chip (100030C) ROM1 = 32kB MASK, lower chip (250032) CHR: 8kb CHR-RAM Left chip is 74174, center is 74XX (XX=04 or 08), right is 7432 While the original Rush'n Attack is 128 kB UNROM, this one probably contains dumped data from floppy disk (ROM0) and FDS BIOS (R...
by krzysiobal
Sun Nov 03, 2019 1:32 am
Forum: NES Hardware and Flash Equipment
Topic: Zanac (FDS COnversion) - Kaiser KS-7012 (KS-201 chip)
Replies: 0
Views: 2292

Zanac (FDS COnversion) - Kaiser KS-7012 (KS-201 chip)

I got photos of this cartridge. It uses yet another Kaiser custom chips (KS-201). This PCB is emulated under mapper 346 which is different to the Whirlwind Manu port . https://obrazki.elektroda.pl/2064232800_1572767735_thumb.jpg https://obrazki.elektroda.pl/6015412100_1572767740_thumb.jpg Little is ...
by krzysiobal
Sat Nov 02, 2019 12:50 am
Forum: NES Hardware and Flash Equipment
Topic: SNES Partially Loads Game
Replies: 13
Views: 5014

Re: SNES Partially Loads Game

->Check if the power supply is OK. *Powering my SNES using 12V 1.3A DC makes it behave weird - sometimes after a few minutes the console just resets or power downs and then cannot be turned on for next few seconds. Either some thermal protection inside power supply or the rectifier bridge in SNES ca...
by krzysiobal
Fri Oct 25, 2019 12:30 pm
Forum: NES Hardware and Flash Equipment
Topic: Dragon Ball 3 - Gokuu Den PCB TTL
Replies: 20
Views: 5335

Re: Dragon Ball 3 - Gokuu Den PCB TTL

Thanks to zxbdragon photos I was able to rev-en this PCB. Surprisingly I was almost 100% accurate with my guesses, here are differences: * CHR-ROM order is 100069C + 100068C, not vice versa * MJ338986 is 74191 with CLK and /CNTEN pins swapped (pin4=CLK, pin14=/CNTEN) * $600A.0 must be written with 0...
by krzysiobal
Mon Oct 21, 2019 11:07 am
Forum: NES Hardware and Flash Equipment
Topic: Dragon Ball 3 - Gokuu Den PCB TTL
Replies: 20
Views: 5335

Re: Dragon Ball 3 - Gokuu Den PCB TTL

Oh, I realized that because all regs are under $8000, so no bus conflicts occur and PRG-ROM-/CE can be directly diven by CPU-/ROMSEL, freeing up 1/2 of 139 which can be used as PPU-A12 inverter, and so the 7474 can be used to acknowledge IRQ: https://obrazki.elektroda.pl/6197550600_1571681131_thumb....
by krzysiobal
Mon Oct 21, 2019 2:24 am
Forum: NES Hardware and Flash Equipment
Topic: Dragon Ball 3 - Gokuu Den PCB TTL
Replies: 20
Views: 5335

Re: Dragon Ball 3 - Gokuu Den PCB TTL

https://obrazki.elektroda.pl/8905204200_1571649889_thumb.jpg MJ 338985 is probably 74*191: * pins 11 of IC1 and IC2 are wired together (pin 11 = !LD - that would match) * pin 5 of IC2 is wired to VCC (that forces the counter into down count mode - thats also how it works in mapper 16, submapper 4 )...
by krzysiobal
Sun Oct 20, 2019 1:25 am
Forum: NES Hardware and Flash Equipment
Topic: Dragon Ball 3 - Gokuu Den PCB TTL
Replies: 20
Views: 5335

Re: Dragon Ball 3 - Gokuu Den PCB TTL

If you want to get help, provide more information. If you're in possesion of the cartridge, make proper photo of both sides : - either with every chip desoldered, - or at least without those where are many vias underneath, - or be prepared prepared to answer question about which pin connect to which...
by krzysiobal
Sat Oct 19, 2019 10:23 am
Forum: NES Hardware and Flash Equipment
Topic: Doki Doki Panic - Pirate FDS port
Replies: 7
Views: 6471

Re: Doki Doki Panic - Pirate FDS port

Cut trace and add:
Image
by krzysiobal
Sat Oct 19, 2019 9:32 am
Forum: NES Hardware and Flash Equipment
Topic: Doki Doki Panic - Pirate FDS port
Replies: 7
Views: 6471

Re: Doki Doki Panic - Pirate FDS port

As you can see, the signal used to generate RAM /CE uses many gates, lot of paths with different length (up to 7 gates), which might result in hazards or quick pulses. Your SRAM is 70ns which might be vulnerable to such hazards (original was 200ns). Try slower RAM or some circuit do delay falling ed...
by krzysiobal
Wed Oct 16, 2019 10:30 am
Forum: NES Hardware and Flash Equipment
Topic: 8in1 multicart
Replies: 21
Views: 5480

Re: 8in1 multicart

Try that: Another weird thing is that: * PAL.15 controls whether CHR-ROM is enabled (0) or disabled (1), * PAL.18/19 controls whether CHR-RAM is enabled (1) or disabled (0). No idea why they separated this into 2 pins. This way there can be also bus conflct or open bus when the value on those pins d...
by krzysiobal
Wed Oct 16, 2019 4:39 am
Forum: NES Hardware and Flash Equipment
Topic: Kaiser chips KS204/KS203/KS202 + kaiser boards
Replies: 14
Views: 5749

Re: Kaiser chips KS204/KS203/KS202 + kaiser boards

Oh, now I realized that the description for PRG banking in non-MMC1 mode that I wrote is exactly how MMC1 works, just cut down to PRG-A15 and PRG-A14 (max 64 kB ROM), so that's nothing new :oops: That would mean this mode can be used for MMC1 games with up to 64 kB PRG-ROM and CHR either as RAM or c...
by krzysiobal
Wed Oct 16, 2019 3:22 am
Forum: NES Hardware and Flash Equipment
Topic: 8in1 multicart
Replies: 21
Views: 5480

Re: 8in1 multicart

Presumable order of ROM chunks: PRG: 512 kB ROM (U2) + 512 kB ROM (U3) + 32 kB ROM (U1) + 8 kB RAM (U5, not soldered) CHR: 512 kB ROM (U10) + 512 kB ROM (U4) + 8 kB RAM (U6) [...A.BCD] $6000-$7fff - control register, set to 0 on powerup/reset | ||| | ||+-- PRG/CHR-A17 | |+--- PRG/CHR-A18 | +---- PR...
by krzysiobal
Tue Oct 15, 2019 6:05 am
Forum: NES Hardware and Flash Equipment
Topic: Kaiser chips KS204/KS203/KS202 + kaiser boards
Replies: 14
Views: 5749

Re: Kaiser chips KS204/KS203/KS202 + kaiser boards

I did more testing to he KS203 chip. It also seems to have 2 modes: MMC1 and non-MMC1 . Switching between them works exactly the same like in KS204 (here - pin 20 decides: VCC=MMC1, GND=non-MMC1) .--\/--. .--\/--. PRG A17 <- |01 24| <- PPU A10 /PPU A11 <- |01 24| <- PPU A10 PRG A16 <- |02 23| <- PPU...