8 IN 1 SLROM Multicartridge

Discuss hardware-related topics, such as development cartridges, CopyNES, PowerPak, EPROMs, or whatever.

Moderator: Moderators

User avatar
Snacks
Posts: 40
Joined: Mon Feb 04, 2013 10:47 pm
Location: NTDEC

Re: 8 IN 1 SLROM Multicartridge

Post by Snacks »

There is a possibility for a future version 4 in 1 for 27C040 users?
The 100 Mega Shock
lidnariq
Posts: 11432
Joined: Sun Apr 13, 2008 11:12 am

Re: 8 IN 1 SLROM Multicartridge

Post by lidnariq »

I'm pretty certain you should be able to just take the first halves of the resultant images and have it work: the 74'174 has been wired to boot the cartridge into the first 128KiB.

You'll need to modify the menu to only offer the first four. (otherwise 5-8 will map to 1-4)
User avatar
FARID
Posts: 499
Joined: Wed Apr 07, 2010 1:14 am
Location: Iran
Contact:

Re: 8 IN 1 SLROM Multicartridge

Post by FARID »

There is no need for 74HC238, WRAM CE can do the job alone as a clock signal for 74HC161.
Also I have a clone MMC1 which don't have WRAM CE at all (it is NC), for this kind of MMC1 the clock signal can be generated by decoding STA $8010 with 74HC139 :
CPU R/W = 0
/ROMSEL = 0
PRG A4 = 1
Attachments
01.PNG
01.PNG (4.27 KiB) Viewed 9027 times
02.PNG
02.PNG (6.79 KiB) Viewed 9029 times
User avatar
FARID
Posts: 499
Joined: Wed Apr 07, 2010 1:14 am
Location: Iran
Contact:

Re: 8 IN 1 SLROM Multicartridge

Post by FARID »

Ruslansh wrote:What a menu will work with this scheme? - download/file.php?id=1331
This should work (From the first post) : Menu Patch
Ruslansh wrote:games using WRAM will normally work?
Yes, they also work
Ruslansh wrote:download/file.php?id=1331 - what needs to change in the scheme that would make it work? I use w27e040 eeprom
It should work, check everything again.
Ruslansh
Posts: 42
Joined: Sun Apr 28, 2013 3:27 am

Re: 8 IN 1 SLROM Multicartridge

Post by Ruslansh »

Image хостинг картинок

Soldered this scheme. Rechecked. Menu filled from the first post. Cartridge menu starts - games does not change.
User avatar
FARID
Posts: 499
Joined: Wed Apr 07, 2010 1:14 am
Location: Iran
Contact:

Re: 8 IN 1 SLROM Multicartridge

Post by FARID »

Does it work with the schematic from the first post?
Ruslansh
Posts: 42
Joined: Sun Apr 28, 2013 3:27 am

Re: 8 IN 1 SLROM Multicartridge

Post by Ruslansh »

From the first post I did not. I want to do that this would work. I'll collect the cartridge MMC1 and MMC3 on the same board. I need that to one scheme worked with two mappers.
lidnariq
Posts: 11432
Joined: Sun Apr 13, 2008 11:12 am

Re: 8 IN 1 SLROM Multicartridge

Post by lidnariq »

Ruslansh wrote:games does not change.
Check the following:
* Make sure you've wired the resistor/capacitor/diode correctly. The voltage on pin 1, while the famiclone is powered and reset is pressed, should be 0V. It should then go to 5V once you release reset.
* Make sure pin 2 is connected correctly.
* Make sure pins 7, 8, 10 are grounded.

Also, try changing the capacitor to be connected to ground instead of +5V.
Ruslansh
Posts: 42
Joined: Sun Apr 28, 2013 3:27 am

Re: 8 IN 1 SLROM Multicartridge

Post by Ruslansh »

There is a menu for MMC3 mapper for games 256 kb.?
lidnariq
Posts: 11432
Joined: Sun Apr 13, 2008 11:12 am

Re: 8 IN 1 SLROM Multicartridge

Post by lidnariq »

Farid had previously made this one for 128 KiB MMC3 games, but it could easily be modified to support 256 KiB PRG instead.
Ruslansh
Posts: 42
Joined: Sun Apr 28, 2013 3:27 am

Re: 8 IN 1 SLROM Multicartridge

Post by Ruslansh »

Ruslansh wrote:Image хостинг картинок

Soldered this scheme. Rechecked. Menu filled from the first post. Cartridge menu starts - games does not change.

This scheme does not work with the menu 8 in 1 but it works with the menu under MMC 3 mapper for games ninja gaiden 3 in 1
User avatar
FARID
Posts: 499
Joined: Wed Apr 07, 2010 1:14 am
Location: Iran
Contact:

Re: 8 IN 1 SLROM Multicartridge

Post by FARID »

@Ruslansh

Posting some pictures may make me passionate :D
Ruslansh
Posts: 42
Joined: Sun Apr 28, 2013 3:27 am

Re: 8 IN 1 SLROM Multicartridge

Post by Ruslansh »

FARID wrote:@Ruslansh

Posting some pictures may make me passionate :D
I do not understand
zxbdragon
Posts: 498
Joined: Mon Dec 12, 2011 8:15 pm

Re: 8 IN 1 SLROM Multicartridge

Post by zxbdragon »

nestopia plus! working
User avatar
krzysiobal
Posts: 1037
Joined: Sun Jun 12, 2011 12:06 pm
Location: Poland
Contact:

Re: 8 IN 1 SLROM Multicartridge

Post by krzysiobal »

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
MapperSchematicS.PNG (4.72 KiB) Viewed 3888 times
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 write cycle for $6000-$7fff, it goes high. At this time, the data bus does not have proper values yet (it is around 200ns after), so 74174 latches garbage.
Original MMC1 has a slight delay between begin of cycle and rising edge of WRAM+CE (70ns), but not enough.
AX5202P has even less. Nameless MMC1 clone has around 250ns (maybe that would fit), how much has KS5361 - no idea.

Two solutions:
* Do not latch data lines - latch address lines instead
OR
* Replace 74238 with 74138
Post Reply