ToToTEK.COM

[Xenepp]

*This is now an interest thread for new DRAM cards*

*Ignore this section*

I have some 1mb DRAMs that are suitable for Super Magicoms, Supercoms etc. Anything that uses Soj-20 1mb 80n chips.

If you send your dead RAM card I will replace and test these and ship them back to you for $15 (£7). Let me know what the DRAM chip numbers on your RAM card are before you go ahead to confirm compatability.

*Read this section*

Also, are there many people who need whole new DRAM cards? I could easily get some PCBs made and make some up for those who do, but there would need to be enough people needing them.

Keep in mind all of this will be for systems up to 16 mega bit. The DRAM is not fast enough for larger games but is exactly the same type the original CCL/FFE chips.

I can also clean up battery damaged PCBs for $15 or £7. Shipping is extra.

PM or reply here to register interest.

-Joel

[CrackLtd]

Well, actually, i have a Supercom PRO-1 which got heavy damage thru a leaking battery. When i switch it on the BIOS screen shows up, but it shows me a black screen when i try to load and play a game. Can you fix it?

-----------------------------------
#ToToTEK Channel on EFNet

[Xenepp]

Most likely, I've PM'd you.

-Joel

[kyuusaku]

Note: these copiers can ONLY make use of 512KiB (1M x 4 bit) RAM chips! They don't use the higher address lines for enabling but rather have enable signals because the boards need to be 16-bit wide in order to be used by both 8-bit bus consoles (SNES) and 16-bit (Genesis). If you want to use larger chips, you'll have redesign the DRAM PCB to decode the enable signals back into the most significant address line and build a 1-bit multiplexer synced to the mainboard's to take care of the highest address.

Anyways are you sure you even have 1MiB RAM? See DRAM is built in square grids, and a 2M x 4 chip would have an uneven number of address lines which is very uncharacteristic. Generally if you want to increase your capacity with DRAM, you either get more of the same chip and decode them (as early FFE/CCL boards do...), or you upgrade to a chip with the same address bus (keeping things square) but with a wider data bus (some of the later Pro Fighters do this.)

Also, 80ns is SLOWER than 70ns; ideally you want 60ns RAM for the best chance at FastROM on a Magicom.

[Xenepp]

80ns is slower? That would explain a lot! I've been tinkering with ROM and RAM for a while now and still have much to learn. I'm glad then, since I only had a hand full of the 80's, have lots of 70ns chips!

These chips are 1Mx4, in fact, the reason I got them was they were in a lot with some that have the same model number as those used in my Supercom. All are the same type of chip however and I've checked their datasheets, only difference with some is the access speed.

I only intend to replace dead DRAMs on the existing PCBs, though if there was enough interest I could easily recreate the entire PCB to make things easier and for those who don't have RAM in their units for whatever reason.

Just so I know though, didn't you say in the other thread that the FastROM games required about 120ns? Isn't that twice as slow?

-Joel

[kyuusaku]

[Xenepp]

[DoctorBackup]

Just so you know, Tomy/Tototek will replaced bad RAM chips on DRAM boards for people. Infact he replaced my friends dead UFO 8 chips on his DRAM board and now his UFO 8 works perfectly. As far as upgrading, I dont think he does that do to the reasons you ran in to. I personally am interested in your method of cleaning up leaking batteries on the PCB's? As for:

[Xenepp]

[Trenton_net]

People aren’t out to get you. Kyuusaku is just pointing out the facts. His estimates regarding DRAM failure is completely accurate. I’ve never seen any copier that failed outright due to a DRAM defect. The only time I can even remember anything remotely related to wide-spread DRAM issues were with crummier copiers that used sub-par parts from Laptops, proprietary memory, etc. In those cases, stores had to ship everything back to HK for servicing, which sucks when half your stock is defective!

But anyway, from reading your post it seems like your trying to paint DRAM as a major issue for failures, when it really isn’t. It wouldn’t be very responsible to sell people on a fix’s that probably won’t do anything. It also doesn’t help your case, when your trying to sell people on this, when you don’t even understands the latency/speed rating for chips?!?

[Xenepp]

[Hisoka_Ryodan]

I don't understand why this turned into what it did. Xenepp offered help, and said what he had to say about how he would do it. It seems like people are accussing him of many things that where not said. Regardless of how big or small of a problem these DRAM's are, you said there is a 1% chance of them failing, right? That means it IS possible for this to happen, correct? And if it did happen to some1, wouldn't it be great if somebody offered help to fix it? I don't see what the big deal is. Thank you Xenepp for your offer to help those with DRAM problems.

[DoctorBackup]

[kyuusaku]

Like everyone said, I'm just stating facts. One of these facts is that most electronic enthusiasts don't know the basics and I'll be the first to admit that there is always much for anyone to learn. I'm not calling you or anyone an idiot and I'm sorry if you were offended by the explanation, but it appeared necessary since you were comparing DRAM to ROM speeds while ignoring the address multiplexing logic I was talking about in the other thread.

[Xenepp]