Search found 77 matches

by mightydidz
Fri May 07, 2021 3:04 pm
Forum: Reproduction
Topic: iNes mapper 159 with 512KiB PRG
Replies: 26
Views: 5322

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: 849

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: 849

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: 7052

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: 7052

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: 7052

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: 7052

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: 7052

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: 7052

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?
by mightydidz
Thu Feb 18, 2021 1:15 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: 7052

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

If I switch those two, would it work? would it latch only $8000-$FFFF? Since I need to drive outputs on other occasion than cup accessing PRG ROM, what signal would be better? I only used R/W and /Romsel since those are the two used on oem cartridge with 74'161. My design would have multiple jumpers...
by mightydidz
Thu Feb 18, 2021 6:39 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: 7052

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

8bit latch is a bit cheaper than 2 counters. I don't need the other features of the counters. (correct my if I'm wrong :roll:) I was thinking of 74'374 which is pretty cheap. Would cpu-r/w on CLK and /romsel on OE with a 10k pull-up would work? I'm uncertain on which one goes where. The eight flip-f...
by mightydidz
Wed Feb 17, 2021 7:30 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: 7052

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

Mapper 11 is using a 74ls377 8bit latch for bank switch.
While bandai 152 is using 2x 74'161 counter.

Any suggestion on which is the better option to make all those mappers?

Thanks
by mightydidz
Mon Feb 15, 2021 12:58 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: 7052

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

Good days guys, I'd like to improve one of my design so it may support additional mappers. Currently I'm using a 74'161 with a 74'32 to make Ax, Cx, Gx, Ux. With some jumpers I can also make Panesian. I'd like to push it a little further adding mapper 152 and mapper 11. But those requires an additio...
by mightydidz
Tue Feb 09, 2021 5:43 am
Forum: Reproduction
Topic: Jay and silent bob mall brawl
Replies: 1
Views: 2881

Jay and silent bob mall brawl

Ines 2.0 says mapper 1 with 8kib of save ram.
mmc1 board with both chr & prg Rom with wram would work?

Is it really mmc1 or its custom mapper?