Search found 91 matches

by Kayumba
Thu Oct 29, 2020 9:11 am
Forum: Reproduction
Topic: SNES Repro 27C040 / M27C801 Lo/Hirom - Multirom support
Replies: 0
Views: 1646

SNES Repro 27C040 / M27C801 Lo/Hirom - Multirom support

Hi everyone, Here is my final work of my pcb design ! SNES Repro 27C040 / M27C801 Lo/Hirom - Multirom support (2in1 or 4in4) https://i6.imageban.ru/out/2020/10/29/0ea01cbe57bc2e6443985e44dbada44f.jpg https://i2.imageban.ru/out/2020/10/29/cb48d43c775a82bd01f87b249a8464d6.jpg https://i4.imageban.ru/ou...
by Kayumba
Thu Oct 29, 2020 9:02 am
Forum: Reproduction
Topic: how to use Use 27C040 in PCB for M27C801
Replies: 30
Views: 7833

Re: how to use Use 27C040 in PCB for M27C801

Here is my last version of pcb. https://i6.imageban.ru/out/2020/10/29/0ea01cbe57bc2e6443985e44dbada44f.jpg http://rover.ebay.com/rover/1/709-53476-19255-0/1?icep_ff3=2&pub=5575378759&campid=5338273189&customid=&icep_item=274405099559&ipn=psmain&icep_vectorid=229480&kwid=902099&mtid=824&kw=lg&toolid=...
by Kayumba
Sun Sep 27, 2020 4:36 pm
Forum: Reproduction
Topic: SNES M27C801 2in1 HiRom games - Diagram for Flip-flop 74HC74
Replies: 23
Views: 7708

Re: SNES M27C801 2in1 HiRom games - Diagram for Flip-flop 74HC74

After what I found on the net that other people do.
I Will test this schema and tell you if it will works for M27C801 2in1 HiRom/LoROM, without making SWAP BIN:

Image
by Kayumba
Thu Sep 24, 2020 6:43 am
Forum: Reproduction
Topic: SNES Multirom menu builder
Replies: 0
Views: 1581

SNES Multirom menu builder

Hello to everyone,

Do you know If there is some software to create easy SNES Multirom menu ?
by Kayumba
Thu Sep 17, 2020 10:31 pm
Forum: Reproduction
Topic: 27C801 without SWAP BIN
Replies: 1
Views: 1884

Re: 27C801 without SWAP BIN

If some one are need this informations :
M27C801 pin 24 (/OE) -----> Cartridge connector pin 23 (/RD)
Or
M27C801 pin 24 (/OE) -----> Cartridge connector pin 49 (/OE)
Two version will works.
by Kayumba
Thu Sep 17, 2020 9:47 am
Forum: Reproduction
Topic: SNES M27C801 2in1 HiRom games - Diagram for Flip-flop 74HC74
Replies: 23
Views: 7708

Re: SNES M27C801 2in1 HiRom games - Diagram for Flip-flop 74HC74

I tried to use the same diagram with not swapped bins (.SMC EPROM). I just tied pin1 (A19) of M27C801 to Data Out 2 But it doesn't work. It's work only with swapped method . Whats wrong? If it's always A19, why its dont work anymore ? https://i2.imageban.ru/out/2020/08/27/5960207019861715449f5e51853...
by Kayumba
Wed Sep 16, 2020 11:24 am
Forum: Reproduction
Topic: how to use Use 27C040 in PCB for M27C801
Replies: 30
Views: 7833

Re: how to use Use 27C040 in PCB for M27C801

I found that some custom PCB use different connections. M27C801 pin 24 (/OE) -----> Cartridge connector pin 23 (/RD) M27C801 pin 24 (/OE) -----> Cartridge connector pin 49 (/OE) I am confuse. Why so? Nintendo released PCBs with both layouts. Pedantically, only the former is correct. A lot of people...
by Kayumba
Wed Sep 16, 2020 4:16 am
Forum: Reproduction
Topic: how to use Use 27C040 in PCB for M27C801
Replies: 30
Views: 7833

Re: how to use Use 27C040 in PCB for M27C801

Hello again, When no swapbinning , I found that some custom PCB use different connections. M27C801 pin 24 (/OE) -----> Cartridge connector pin 23 (/RD) M27C801 pin 24 (/OE) -----> Cartridge connector pin 49 (/OE) I'am confuse. Why so? For me the second one is the right one. Why connect to pin 23 (/R...
by Kayumba
Wed Sep 09, 2020 4:40 pm
Forum: Reproduction
Topic: Battery circuit : Save game are not holding on SRAM
Replies: 18
Views: 3621

Re: Battery circuit : Save game are not holding on SRAM

You think about it. I explain how decoders work in that post. If you can understand how everything works on the board you'll be able to troubleshoot things like this a lot easier, instead of just relying on a table. Thank you, I always go back to you page explainer when I try to understand some thi...
by Kayumba
Wed Sep 09, 2020 1:13 pm
Forum: Reproduction
Topic: Battery circuit : Save game are not holding on SRAM
Replies: 18
Views: 3621

Re: Battery circuit : Save game are not holding on SRAM

poorstudenthobbyist wrote:
Wed Sep 09, 2020 12:41 pm
...What happens to the output of the decoder when you switch A13 and A14?
How can I see what happens?
by Kayumba
Wed Sep 09, 2020 12:34 pm
Forum: Reproduction
Topic: Battery circuit : Save game are not holding on SRAM
Replies: 18
Views: 3621

Re: Battery circuit : Save game are not holding on SRAM

I still confuse. I found that I probably made some mistakes on my circuit for SRAM decoder 74HC139. if I compare with poorstudenthobbyist https://thepoorstudenthobbyist.com/2019/05/18/custom-pcb-explanation/#memorymap https://i2.imageban.ru/out/2020/09/03/04526e73f99cdf62863991aebbcce500.png Pin2 (1...
by Kayumba
Thu Sep 03, 2020 9:35 am
Forum: Reproduction
Topic: Battery circuit : Save game are not holding on SRAM
Replies: 18
Views: 3621

Re: Battery circuit : Save game are not holding on SRAM

Strange, strange... I tried to make on same board some saves of games. I take « Mario All stars » LoROM game (64kb RAM). ROM files was also expanded to 27C322 EPROM. When i take of and put it again, i see file name created. So its holds Data inside. But when I load game with this file, Game starts f...
by Kayumba
Thu Sep 03, 2020 3:16 am
Forum: Reproduction
Topic: Battery circuit : Save game are not holding on SRAM
Replies: 18
Views: 3621

Re: Battery circuit : Save game are not holding on SRAM

I use HM62 64 ALP-10 Then I tested with HM62 256 ALP-10. This schematic is only for a 64 kibit RAM. It will not work with a 256 kibit RAM: pin 26 became an address line, no longer an enable. For a 256 kibit RAM, you must use a schematic that gently pulls pin 20 high when power is removed. I found m...
by Kayumba
Wed Sep 02, 2020 5:53 pm
Forum: Reproduction
Topic: Battery circuit : Save game are not holding on SRAM
Replies: 18
Views: 3621

Re: Battery circuit : Save game are not holding on SRAM

poorstudenthobbyist wrote:
Wed Sep 02, 2020 5:48 pm
Do you have both 139s in the board?
No.
I put only one,
and solder jumpers for LoROM decoder