pcmhacking.net

I wonder if you could tap it with a logic analyzers on all of the I/Os and reverse engineer the logic structure from that data? I'm sure there would be software with algorithms that can do that for you.

Not really, because the data is very stateful. Eg if its a sound chip, brute forcing every possible combination of data stream to replay reset, initialise, enable certain outputs, load values to certain registers is too long to brute force. And then the sound output is analogue.

Some emulators do this though, where the programming information is known. Its done a lot for not fully understood chips in arcade machines, and esentially plays back recordings rather than generating the output on the fly. But, then your not chip compatible... and wierd stuff like this cant work - 8088MPH "this demo breaks all your emulators" https://www.youtube.com/watch?v=hNRO7lno_DM also an interesting technical read here http://8088mph.blogspot.com.au/2015/04/ ... 256_colors

The gotcha is that its a lot more than a gate array, its an electronic machine in there.... The rom chips are easy and dumped, they're not your problem.

Have you seen natami.net? I havnt.. The sites been dead for 2 days. Supposedly its new amiga hardware which can run amigaos 3.1. If this is more than a transient outage on their site it doesnt seem good for the return on investment building kit for such a specific audience

Wow! Although a highly integrated implementation, with enhancements and adaptations, rather than individual chip-level implementations, the NatAmi project does indeed seem to recreate the functionality of the Denise, Agnus and Paula ASIC's :
http://web.archive.org/web/201604190702 ... rdware.htm

Joe.

thanks guys. nice one joe. first place i went to
nothing is ever deleted from the interballs

joe it sounds to me like someones already got the logic from the CPUs. interesting.

antus wrote:Have you seen natami.net? I havnt.. The sites been dead for 2 days. Supposedly its new amiga hardware which can run amigaos 3.1. If this is more than a transient outage on their site it doesnt seem good for the return on investment building kit for such a specific audience

Their FB page hasn't been touched since 2012.

yah. doesn't instill a whole heap of faith.

i went to get this


and these came home too. the bloke gave them to me.


so yesterday in my not so tired state i opened up one of the 2K to find this. which is pretty normal.



drilled out the screw that had rusted in.
cleaned the board and removed the battery


traces look OK and buzzed out alright on the multimeter


i'll start a seperate thread for my amiga shit.

Nice score! The Good thing about tech of that age is that it shouldnt be too hard to fix. I thought that cap next to the battery might be in trouble too but it looks like it cleaned up well. I'd be interested to see how you go with this.

That battery reminds me of a previous job where we stored one of the last old PC with ISA bus just as a backup incase an old production machine failed. I replaced the battery with a brand newie before putting it on the shelf as I knew nobody else would ever touch it. Probably the backup would have still just worked if it was needed but the production hardware was updated before it was required.

yeah - pretty happy.
long drive. friday i drove to porepunkah, then, saturday AM i drove to tumbarumba in NSW, then, picked up the machines and then drove home to hoppers crossing (735km in one day, not doing that again, ever)

thing with the batteries antus, apparently if they don't get tickled (this is 3.6v) they leak? would be better to have a header there with a remotely mounted battery or something similar by velcro. which thinking of it might not be a bad idea, a couple of 1.5v NIMH in a little holder velcroed to the side of the case would be a good idea. i don't think .6v would matter all that much ...

That sounds about right. They all tend to leak once they've failed and there is still draw on them. The PC ones I was referring to were the Li-on button batts so there is no charge circuit and you get 5+ years out of them without touching them. Whatever you do, I guess its worth checking every so often to be sure.