Search found 82 matches

by mightydidz
Sat Jun 12, 2021 2:34 am
Forum: Reproduction
Topic: iNes mapper 76 with 256 KiB?
Replies: 2
Views: 761

Re: iNes mapper 76 with 256 KiB?

I only have a superpro 610p for programming.
What would i need to program those logic array ic?
by mightydidz
Fri Jun 11, 2021 7:54 am
Forum: Reproduction
Topic: iNes mapper 76 with 256 KiB?
Replies: 2
Views: 761

iNes mapper 76 with 256 KiB?

I was looking online to see if there is a way to upgrade PRG size on an original Namcot board instead of hacking a mmc3? http://forums.nesdev.com/viewtopic.php?f=28&t=13990 Idealy I would like to add extra hardware but havent found anything for Namcot108 https://wiki.nesdev.com/w/index.php/User:Lidn...
by mightydidz
Mon Jun 07, 2021 7:58 am
Forum: Reproduction
Topic: iNes mapper 75 with 256KiB PRG
Replies: 8
Views: 1162

Re: iNes mapper 75 with 256KiB PRG

Something like this?
by mightydidz
Fri Jun 04, 2021 1:22 pm
Forum: Reproduction
Topic: iNes mapper 75 with 256KiB PRG
Replies: 8
Views: 1162

Re: iNes mapper 75 with 256KiB PRG

whatever is cheaper would fit my need, the 4x4 register seems to be pretty expensive although it would be a compact addon.

The 74'138+74'259+74'153 seems also a nice option, can someone let me know what specific signals are needed?

Thanks
by mightydidz
Fri Jun 04, 2021 7:53 am
Forum: Reproduction
Topic: iNes mapper 75 with 256KiB PRG
Replies: 8
Views: 1162

iNes mapper 75 with 256KiB PRG

I'd like to make an English translation but it oversize PRG to 256KiB. http://www.romhacking.net/translations/3751/ I need to figure a way to add PRG-A17 I've looked at these references but nothing for VRC1 https://wiki.nesdev.com/w/index.php/User:Lidnariq/Mapper_thoughts any one knows what to decod...
by mightydidz
Fri May 07, 2021 3:04 pm
Forum: Reproduction
Topic: iNes mapper 159 with 512KiB PRG
Replies: 26
Views: 9573

Re: iNes mapper 159 with 512KiB PRG

Its been a while since I worked on this project but I finally received my prototype pcb adding those 3 extra components 74'138, 1G79 and 1G32. It works with regular japanese rom and some other 159 mapper games, but not with the english Knight Gundam Monogatari. https://www.romhacking.net/translation...
by mightydidz
Mon May 03, 2021 5:55 am
Forum: Reproduction
Topic: SNES VHDL mappers for CPLD
Replies: 3
Views: 2737

Re: SNES VHDL mappers for CPLD

I know its pretty simple, its only a N+1 address line for lorom skipping A15. Only SRAM!CE and Rom!CE need special attention, but aren't difficult to program into a VHDL code. I simply wanted to save time for vhdl design. I want a mapper with a single jumper to select between lorom/hirom and possibl...
by mightydidz
Fri Apr 30, 2021 3:40 pm
Forum: Reproduction
Topic: SNES VHDL mappers for CPLD
Replies: 3
Views: 2737

SNES VHDL mappers for CPLD

Hello guys, I was wondering if any of you know if an open source vhdl code exist for the snes cartridge mapper. In the past I built myself some repro cart using discrete hardware and jumpers to choose between lo/hi/ex and it worked fine. I'd like to port it into a CPLD, something like a MAXII, I'll ...
by mightydidz
Sun Feb 21, 2021 6:38 pm
Forum: NES Hardware and Flash Equipment
Topic: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers
Replies: 19
Views: 7882

Re: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers

Here is 74'161 pinout .--\/--. /Clear --|01 16|-- +5V Clock --|02 15|-- CarryOut D0 --|03 14|-- Q0 D1 --|04 13|-- Q1 D2 --|05 12|-- Q2 D3 --|06 11|-- Q3 CountEnable --|07 10|-- CarryIn Gnd --|08 09|-- /Load `------' And here is how its connected on a CNROM .--\/--. +5V --|01 16|-- +5V /romsel --|02 ...
by mightydidz
Fri Feb 19, 2021 5:04 pm
Forum: NES Hardware and Flash Equipment
Topic: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers
Replies: 19
Views: 7882

Re: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers

Interesting... So 74'377 would better suit my need than a 74'374? Ive read a bit on discrete mappers https://wiki.nesdev.com/w/index.php/Category:Discrete_logic_mappers https://wiki.nesdev.com/w/index.php/User:Lidnariq/Discrete_Logic_Table Can you give me additional explanation or references please?...
by mightydidz
Fri Feb 19, 2021 6:35 am
Forum: NES Hardware and Flash Equipment
Topic: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers
Replies: 19
Views: 7882

Re: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers

Is it related to being a transparent latch?
Would 74ls377 also requires additional boolean hardware?
by mightydidz
Thu Feb 18, 2021 4:12 pm
Forum: NES Hardware and Flash Equipment
Topic: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers
Replies: 19
Views: 7882

Re: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers

comparing with other discrete using 74'161, only /romsel and cpu-r/w are used. /clear is tied high and counts enable (PE and TE) are grounded. So I guess its only used as a D type latch no counting here? The bank select registers are $8000-$FFFF. Famicom doesn't give direct access to A15, so I have ...
by mightydidz
Thu Feb 18, 2021 3:02 pm
Forum: NES Hardware and Flash Equipment
Topic: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers
Replies: 19
Views: 7882

Re: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers

Nice to know that the bus conflict isn't an issue here, I was precisely thinking about the 74'02 onboard the anrom. Regarding hardware, I'd like to keep as simple and clean as possible for a reasonnable price. I like the 8bit latch idea. If it's only a small amount of hardware it's not an issue I st...
by mightydidz
Thu Feb 18, 2021 2:33 pm
Forum: NES Hardware and Flash Equipment
Topic: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers
Replies: 19
Views: 7882

Re: most efficient hardware for universal discrete board (Ax,Cx, Gx, Ux, BA & CD) mappers

Lot of hardware?
There is not a big price difference between 74hc374 and 2x 74hct161.

If I go with two counter, do I also need to add extra hardware to avoid bus conflict?