Search found 30 matches

by mightydidz
Sat Oct 17, 2020 5:29 am
Forum: NES Hardware and Flash Equipment
Topic: is CY62256NLL drop-in replacement for AS6C62256?
Replies: 1
Views: 407

is CY62256NLL drop-in replacement for AS6C62256?

I was previously using for couple of my pcb, but now my supplier is having issue finding the Alliance SRAM I'm using sTSOP-28 package https://www.digikey.ca/en/products/detail/alliance-memory-inc/AS6C62256-55STIN/4499003 I was wondering if the Cypress would be a direct fit replacement? https://www.d...
by mightydidz
Tue Oct 13, 2020 9:00 pm
Forum: NES Hardware and Flash Equipment
Topic: AX5904 WRAM control
Replies: 7
Views: 596

Re: AX5904 WRAM control

I will use a 62256 wram. Do i need the same 56p rc delay on ram-!ce with the inverter?
by mightydidz
Tue Oct 13, 2020 3:17 pm
Forum: NES Hardware and Flash Equipment
Topic: AX5904 WRAM control
Replies: 7
Views: 596

Re: AX5904 WRAM control

mightydidz wrote: I'm just concerned about this delay your mentioning compared to MMC1B2? I'm not an expert with scope, but your comparing M2 and Wram+ce? Correct me, but I dont see any Wram+ce on AX5904? what about pin 6? Sorry, I'm blind I was checking Kaiser Clone on wiki. Since AX5904 is the sa...
by mightydidz
Tue Oct 13, 2020 2:16 pm
Forum: NES Hardware and Flash Equipment
Topic: AX5904 WRAM control
Replies: 7
Views: 596

Re: AX5904 WRAM control

Is it better to have WRAM always enabled or should I re-create WRAM+CE using M2+delay?
And what about the no RAM circuit? How can I safely deglitch this delay?
I've seen reproboard online that uses AX5904. Are they reliable?
by mightydidz
Tue Oct 13, 2020 7:41 am
Forum: NES Hardware and Flash Equipment
Topic: AX5904 WRAM control
Replies: 7
Views: 596

AX5904 WRAM control

Guys, I'm searching infos on how MMC1 clone AX5904 controls WRAM.
I'd like to avoid salvaging boards, so using clone is interesting.
I'm wondering if a schematic is available to use AX5904 for SN, SO, SU, SX, SZ builds.
Does it have timing issue compared to Genuine MMC1?
by mightydidz
Thu Oct 08, 2020 6:51 am
Forum: Reproduction
Topic: GNROM repro Doraemon title screen glitch
Replies: 1
Views: 196

GNROM repro Doraemon title screen glitch

I've built myself a GNROM repro (English Doraemon) and it works fine, except that on bootup there is some artifact on screen. Just a quick touch on reset button and its fine. I'm wondering what's on my board that need to be fixed, maybe delaying a signal? Maybe adding a delay cap on the 74'161? Here...
by mightydidz
Mon Oct 05, 2020 11:12 am
Forum: NES Hardware and Flash Equipment
Topic: iNes mapper 163 vhdl code for XC9536???
Replies: 19
Views: 1750

Re: iNes mapper 163 vhdl code for XC9536???

Isn't a XC9536 only have 36 macrocells? Honestly though, I wouldn't worry about what chip the original board used. Once you write the HDL for it, you can port it to whatever CPLD/FPGA you want. That's exactly the point of my post, I was wondering if a code already exist so I may port it to another ...
by mightydidz
Mon Oct 05, 2020 9:34 am
Forum: NES Hardware and Flash Equipment
Topic: iNes mapper 163 vhdl code for XC9536???
Replies: 19
Views: 1750

Re: iNes mapper 163 vhdl code for XC9536???

So it needs at least 50 macrocell?
Isn't a XC9536 only have 36 macrocells?

Is there an available VHDL or Verilog code to start working with?
by mightydidz
Sun Oct 04, 2020 2:13 pm
Forum: NES Hardware and Flash Equipment
Topic: iNes mapper 163 vhdl code for XC9536???
Replies: 19
Views: 1750

Re: iNes mapper 163 vhdl code for XC9536???

Here's a closeup of the Reset circuit.
11.jpg
by mightydidz
Sun Oct 04, 2020 5:53 am
Forum: NES Hardware and Flash Equipment
Topic: iNes mapper 163 vhdl code for XC9536???
Replies: 19
Views: 1750

Re: iNes mapper 163 vhdl code for XC9536???

I decided to order it for reverse engineering. Received it on friday. Its definitely a XC9536 and Krysiobal schematic is good, except for "Reset" C6 goes to GND and R3 goes to VCC. I can check for some resistance or capacitance if it can help. I was wondering if anyone have a vhdl code so I may use ...
by mightydidz
Thu Oct 01, 2020 6:55 am
Forum: NES Hardware and Flash Equipment
Topic: iNes mapper 163 vhdl code for XC9536???
Replies: 19
Views: 1750

Re: iNes mapper 163 vhdl code for XC9536???

Isnt it a XC9536 on this pcb?
https://fr.aliexpress.com/item/40006395 ... 6c373VSN7z

How many macrocell a mapper163 requires?
It can probably be ported to another CPLD?
by mightydidz
Wed Sep 30, 2020 9:41 am
Forum: NES Hardware and Flash Equipment
Topic: iNes mapper 163 vhdl code for XC9536???
Replies: 19
Views: 1750

iNes mapper 163 vhdl code for XC9536???

I've come across a mapper163 pcb online
http://www.jinhongpcb.cn/jinshouzhi/16912848.html

I was wondering if anyone have the mapper code.
I think this board uses a XC9536.

Thanks
by mightydidz
Mon Jun 10, 2019 9:24 am
Forum: Reproduction
Topic: SNES Wincupl ATF15xx Repro cart
Replies: 0
Views: 8613

SNES Wincupl ATF15xx Repro cart

Hello everyone, I'm looking for some help with wincupl. I want to build a repro cartridge for the snes and I want to use a cpld instead of 139 decoder and 257 mux. I've already built custom cartridge for snes repro, even multigame cart, but this time I want to make it lighter and differently. I want...
by mightydidz
Fri May 17, 2019 5:52 pm
Forum: Reproduction
Topic: SNES: communication between ROM and PIC
Replies: 3
Views: 8579

Re: SNES: communication between ROM and PIC

koitsu wrote:Is this a duplicate post of viewtopic.php?f=12&t=18862&p=238976 ?
I wasnt sure since its more hardware related. Is it the right place?
by mightydidz
Fri May 17, 2019 2:44 pm
Forum: Reproduction
Topic: SNES: communication between ROM and PIC
Replies: 3
Views: 8579

SNES: communication between ROM and PIC

For SNES: I'm searching a way to use a Rom address line to interact with a PIC MCU. I'm wondering if writing to a particular register could make an address line pulse. I'd like to establish a link between the rom and a pic so I may count I want to write a homebrew menu to count how many time the d-p...