Search found 790 matches

by krzysiobal
Fri Oct 23, 2020 5:04 pm
Forum: NESdev
Topic: Go Dizzy Go Dizziness
Replies: 0
Views: 88

Go Dizzy Go Dizziness

Go Dizzy Go Dizziness There is an arcade game, named Go Dizzy Go, made by CodeMasters. https://obrazki.elektroda.pl/3205270900_1603351674.png https://obrazki.elektroda.pl/1810393300_1603351676.png The standalone game can be acquired from 4 sources and each of them represents a little different ROM! ...
by krzysiobal
Fri Oct 23, 2020 2:47 pm
Forum: NES Hardware and Flash Equipment
Topic: Getsufuu Maden LH17 KS-7021A
Replies: 4
Views: 155

Re: Getsufuu Maden LH17 KS-7021A

This can't be exactly mapper 525, because this maps CHR banks differently. (Eight 7-bit-wide registers at $B00x instead of sixteen 4-bit-wide registers at $B00x-$EFFx) But there are 8 registers, one of 189's address input is GND-ed (Also your PRG and mirroring register masks should be $F000) My fau...
by krzysiobal
Fri Oct 23, 2020 1:05 pm
Forum: NES Hardware and Flash Equipment
Topic: Getsufuu Maden LH17 KS-7021A
Replies: 4
Views: 155

Re: Getsufuu Maden LH17 KS-7021A

Oops, can't attach more than 5 files in 1 message.
by krzysiobal
Fri Oct 23, 2020 1:04 pm
Forum: NES Hardware and Flash Equipment
Topic: Getsufuu Maden LH17 KS-7021A
Replies: 4
Views: 155

Getsufuu Maden LH17 KS-7021A

Code: Select all

$8000:        [....PPP.] (mask: $E000)
$9000:        [.......M] (mask: $E000)
$B000..$B007: [.CCCCCCC] (mask: $F007)
NES 2.0 Mapper 525

Note the inverted CHR-A16 (ROM is dumped using MyKazzo, so it omits that); take it into account when trying to re-use original and/or mask ROM.
by krzysiobal
Fri Oct 23, 2020 9:33 am
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 76
Views: 14087

Re: Help with Kaiser's Highway Star repro

I've just bought the Highway Star LH42 with hope that it is the same blob version as yours. I attach the dump. Highway Star Highway Star 7402+138+174+373+74 [apply over Highway Star (J)].ips One important thing that I ignored: if you look at the schematic, there is the part with 7474 that I consider...
by krzysiobal
Tue Oct 20, 2020 6:25 am
Forum: General Stuff
Topic: SSD died after dropping laptop
Replies: 35
Views: 7767

Re: SSD died after dropping laptop

If u have hard disk HDD0 of size X, buy another two hardisks HDD1 and HDD2 of size >=X and: 1) Do incremental backups of your HDD0 to HDD1. For windows I found good utillity called Cobian Backup. It copies all the files and clears archive atribute to them. Next time you run it (in week, month or so)...
by krzysiobal
Mon Oct 19, 2020 11:24 am
Forum: NES Hardware and Flash Equipment
Topic: 8 IN 1 SLROM Multicartridge
Replies: 34
Views: 18159

Re: 8 IN 1 SLROM Multicartridge

Ok maybe my 200ns was a little overexaggerated, just measured and it is ~118ns But the 70ns of MMC1 was about the original one. Pirated one (with label) had 17ns, which is not enough. No single mapper latches data on rising edge of M2 (or falling of /ROMSEL). They always use the other one. DS1Z_Quic...
by krzysiobal
Mon Oct 19, 2020 10:04 am
Forum: NES Hardware and Flash Equipment
Topic: 8 IN 1 SLROM Multicartridge
Replies: 34
Views: 18159

Re: 8 IN 1 SLROM Multicartridge

* Do not latch data lines - latch address lines instead What an interesting idea to latch the address lines, I never thought of it! For example, any write with ROMSEL = 0 can latch the 8 data bits AND additional address bits. For example: A lot of NROM multicarts do that way. * Half of them latch d...
by krzysiobal
Mon Oct 19, 2020 5:31 am
Forum: General Stuff
Topic: Looks like NESCartDB is down (again)...
Replies: 72
Views: 33365

Re: Looks like NESCartDB is down (again)...

Sumething is wrong here:
by krzysiobal
Mon Oct 19, 2020 4:13 am
Forum: NES Hardware and Flash Equipment
Topic: 8 IN 1 SLROM Multicartridge
Replies: 34
Views: 18159

Re: 8 IN 1 SLROM Multicartridge

I wonder how this multicart can even work. If it does, you are just lucky. According to the schematic from your first post: MapperSchematicS.PNG If you use 74238, which has non-inverted outputs and 74174, which latches on rising edge then at the idle state - latch's CLK is 0. At the beginning of wri...
by krzysiobal
Mon Oct 19, 2020 2:58 am
Forum: NES Hardware and Flash Equipment
Topic: using CHRAM to save games?
Replies: 19
Views: 1152

Re: using CHRAM to save games?

aquasnake wrote:
Sun Oct 18, 2020 11:45 pm
In some early NES systems, this mapped address space (VRAM / ciram and chr-ram) can only be written indirectly by CPU and cannot be read out.
If this was true then many games wouldnt work. For example Flipull - it stores levels in CHR-ROM.
by krzysiobal
Sun Oct 18, 2020 1:52 pm
Forum: NES Hardware and Flash Equipment
Topic: using CHRAM to save games?
Replies: 19
Views: 1152

Re: using CHRAM to save games?

Would battery-backed CHR-RAM like this be any less susceptible to corruption when turning off the power without holding reset? Yea, I started thinking about this aswell. Corruption woud occur when PPU/WE goes down. It happens only when CPU does write to $2007. So theoretically, when voltage goes do...
by krzysiobal
Sun Oct 18, 2020 4:53 am
Forum: NES Hardware and Flash Equipment
Topic: Racermate Challenge 2
Replies: 3
Views: 1545

Re: Racermate Challenge 2

I wonder what is the reason for all pull-ups on data & address lines. Is it to limit the current of RAM in standby mode? From my experience, if RAM does not have "L" letter (low-power) then the amount of current it draws changes if you start touching its legs by finger for example (when powered by b...
by krzysiobal
Sun Oct 18, 2020 12:36 am
Forum: NES Hardware and Flash Equipment
Topic: using CHRAM to save games?
Replies: 19
Views: 1152

Re: using CHRAM to save games?

olddb wrote:
Sat Oct 17, 2020 5:20 pm
Any examples of games using CHRAM to save games?
Princess Maker
by krzysiobal
Sat Oct 17, 2020 2:33 pm
Forum: Reproduction
Topic: Help with Kaiser's Highway Star repro
Replies: 76
Views: 14087

Re: Help with Kaiser's Highway Star repro

tiretrak wrote:
Sat Oct 17, 2020 1:10 pm
krzysiobal wrote:
Sun Oct 11, 2020 1:22 am
Do you have back-side photo of this PCB?
which pcb ?
Image