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As far as I had researched : No need to use C1, C2 and CC. Without these capacitors game runs OK. If you know some advantage of using these capacitors tell me. I have heard capacitors are for power filtering but what will happen if I don't use them? Will it damage to the chips over time, if I not us...

So it should be like this, right? Any kind of advice or suggestion would be greatly appreciated. Front : http://up.iranblog.com/images/2pzizph94jxl7zn7zfch.png Back : http://up.iranblog.com/images/2647e6253fdbf69iwrlt.png Component : MMC3 = AX5202P http://up.iranblog.com/images/ywzsha8hc8aqkp7eiu1h....

socram8888 wrote:OFC I can reprogram them, but that's exactly what I want to avoid (I don't think the PCB would last desoldering a chip a big DIP chip twice)

I'd rather not solder chip directly to the PCB, instead I will use these legs :

So what is the advantage of EPROM over Flash? Even I had bought AM29F010 and AT27C010 the same price! I would have thought EPROM has more life but it is one time programmable, and Flash has less life but it can be programmed several times.

/WE i'm 100% sure that it must be connected to VCC (high). My MMC3 pirate cartridge has these connected to VCC. Leaving it floating may cause malfunctioning Are you Judging about WE according to a real TLROM? Please pay a close attention, I want to make a clone of TLROM by using two AM29F040 (PRG/C...

Are you sure about WE? According to these pictures : http://nintendoallstars.w.interia.pl/romlab/prg3.png http://nintendoallstars.w.interia.pl/romlab/chr3.png Both in PRG and CHR (AM29F040) : Pin 31 (WE) is isolated and is not connected to anything. ******************************** According to here...

This site send inquires to Chinese distributors, it has a very good user interface :

http://www.seekic.com

I will appreciate you more, if you just make the necessary changes on the picture. Simply use paint so that I can understand better.

Please focus on the following pins :

31 (WE)
24 (OE)
22 (CE)

AM29F040 :



Thanks a lot.

I am really confused about OE? To which pin it must be connected?

This document suggests :

Solder pin 24 to GND (OE)

What do you think?

TLROM Schematic


TLROM PCB

The ATMega128 is a micro-controller, not a programmable ROM chip. Have a look at the 29F010 (ordering page is here ). This is a Flash version of the same chip that supports programming at 5VDC and can withstand 1,000,000 erase / write cycles. There is also the 29F020 (256K version) and the 29F040 (...

The circled parts in that pic are C1 - 4.7uF 16V electrolytic (10uF is OK, higher volt ratings are OK). C2 - probably a 0.1uF ceramic capactor (6V rating minimum). I don't know what CC is, it's probably only needed with the real MMC3. Some kind of small filter capacitor. I have found something abou...

I am going to build this :
Willem EPROM Programmer

@qbradq Are you sure that I cannot use ATmega128? Is there any other choice from ATmega series? It is because of my programmer, for Am29F010 I need to buy another programmer. Does Am29F010 support ISP (In System Programming)? @Memblers Yeh, I am kind of a stubborn boy :wink: I will not give up at an...