Reply 40 of 95, by Ozzuneoj
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- l33t
wrote:Wanted to let you know that I shipped my 2.01 firmware chip to TX this afternoon. Should be in my contacts hands by Saturday. On […]
wrote:wrote:I actually know how to dump roms I just haven't a programmer to read them any longer. I had access to one in the late 90s and mi […]
I actually know how to dump roms I just haven't a programmer to read them any longer. I had access to one in the late 90s and missed on the chance to own some very high end ones in the early 2000's when the company I worked from was in the middle of a large move and literally dumped about a half dozen eprom programmer kits to a local recycler. I wasn't happy about it but there wasn't anything I could about it either.
I also asked an acrcade pcb repair guy I know who live in the next state over if he could do it and he never got back with me about it.
But I tell you what, I do have another person I can ask about this and see what they have to say. As you said if I can find someone in the states to do it, it would just be a matter of pulling the chip, putting into some foam, put that into a small zip baggy, into a small box with lots of padding around it.
*UPDATE* Looks like this can happen after all. I've got a good contact in the next state over that shouldn't have a problem with dumping the eprom off it. So...I will see about extracting that 2.01 firmware chip from my MT-200 this weekend and get it ready. I've got the other MT-200 I can keep and use on hand in case there are any issues.
Would there even be a need or interest in the 2.0 version if I get the 2.01 dumped?
That would be fantastic if you could get that ROM dumped. Version 2.01 for sure would be useful. Getting 2.0 dumped probably wouldn't be necessary, unless it turned out there was some kind of compatibility issue or bug with 2.01. I still plan on trying to dump the ones I have, to have the older versions available.
Could you tell from the pics I posted (in this Google Photos gallery) of the internals whether there were any other differences between my original unit (with 1.00 firmware) and your newer ones? I'm hoping they didn't use different firmwares for slightly different internals.
Wanted to let you know that I shipped my 2.01 firmware chip to TX this afternoon. Should be in my contacts hands by Saturday. Once they've dumped it, I'm sure they will email me the raw BIN file and I will be more than happy to include it here.
BTW...that is a pretty large eprom they used in the MT-200. It is a 2meg eprom! Going price on the bay for such chips is about $20 + shipping and you would still have to erase them. And they would be slower than the original as the original eprom is a 120ns chip and the ones I've seen on the bay are 150ns.
Will keep you updated...
Awesome! I've been pretty busy so I haven't had a chance to do anything with the MT-200s since my previous post.
I'm a total ROM\EPROM newbie. Can anyone explain what my options would be for reading and writing ROMs like the ones used in the MT-200? Here's a picture of one of mine:
https://photos.app.goo.gl/Mvaoj5NVVDBzRPmJ3
I know there are ways to use old modems or NICs or even motherboards for dumping and flashing ROMs, but would these 2mbit 32-pin ROMs work with any of these methods? I'm sure there are different voltages and pinouts used on these things too. I also have an old ART EPP-1 EPROM Programmer but it only has a 28 pin socket and it only mentions being compatible with "2716-27513, 25XX and X2864" ROMs.
I'd like to get myself a nice programmer, but so far every time I've needed one it has been for a completely different kind of chip, so I'd need a rather large and flexible kit to cover all my bases... and that'd be quite expensive.
Now for some blitting from the back buffer.