Atari-Forum

Had another thought on this. If the processor was emulated on the ARM would the RAM also need to be on the ARM side to achieve the expected speed?

...thinking about this more, if it needs to be a cycle accurate system (where FPGA is king) to run certain games and demos then adding a super fast 68000 will break it in most cases. The MegaSTE could be switched down to 8MHz for this very reason.

I'm well aware the diferences between FPGAS and prcoessors I see now that the emulators are not as good as I assumed, I thought that would be sorted considering we are +30 years on the tech...

Out of interest, why not just use the arm to run an emulator? The emulators are cycle accurate are they not?

Samtec?

Looks like its had audio modifications done too.

Basically the round up is I have the CPU running ASYNC finally and had it running at 25MHz. I couldn't go any higher (didn't have anymore osc's to hand) but the CPU E-clock running faster causes the ACIA to screw up. After a lot of work, I gave up and decided to do a new test board using the 68SEC0...

Wolfgang does drop in testing, http://experiment-s.de/en/gallery/ Perhaps he tested his cpu core in a real ST motherboard, but I can't tell from the photos. I did talk to Wolfgang a few years ago, and I am not sure he did direct replacements as such. I think he said a lot of signals were not used/n...

Not sure if this helps but you might want to try a lot more patterns of test data like the sort used for testing memory. All high, all low, bit walking, ones and zeroes, lfsr etc etc.

Hi, you can use a hot air gun at low heat and carefully heat up the section of the board where you want to solder. If the board (especially the large ground planes) already has a temperature of ~50 degrees celsius it´t much easier to solder those ground pins. Perhaps you can test the best temperatu...

What termination resistor packs are you using on the CosmosEx? I measured them and they do not seem to be the standard SCSI 220/330 ohm resistor networks (200/330 ohm resistor packs are used internally in the Falcon as well). Could the termination of the CosmosEx be a problem? Well, maybe, but my c...

IIRC they used a 68000 , SEC I think ? Which seems to push beyond 50mhz. I did look into that, but the ST needs 3 wire bus handshakes, The SEC only has 2, so I gave up with that "direction". The 68HC000 only seems to touch at 38Mhz before dieing. From what I can remember the 2 wire bus grant is pre...

Install NVDI?

No interest, then make it free and I've been inundated! I've offered it to the first person so sorry to the others as it's probably gone, but to a good home none the less

Free now, just pay postage, or its going in the bin!

How about driving a signal when a fault occurs so you can trigger your scope? Something fast, maybe a read in the rom port address range and use the active low ROM3 or ROM4 signal.

Hit the CPU or booster with freezer spray. See if that makes a good CPU bad, or the reverse, a bad CPU good. Sounds like timing issues.

You can probably use the latest software, they are CPLDs I think. Lab Tools I think here:
http://www.xilinx.com/support/download/ ... tools.html

Bump, £10 including postage.

About 15 years ago I saw a Mint instalation taking an Xwindow from a linux box to browse the web. Was pretty smart to see but with the Raspberry Pi 3 with Wi-Fi hooked to the DMA port I can imagine it would be much faster. Some kind of simple compression may help too, for plain websites at least, an...

£10 or 15 euros seems reasonable.

Not sure what its worth, original sales invoice from Systems Solutions 1998! Offers, can take Paypal and ship world wide.

joska wrote:

stimpy wrote:Yet again more mis-information about FPGAs

What are you referring to?

...that supporting tricks used by demos isn't neccesary if the FPGA is configured to be the same as the ST at a logic level. Which the Suska project strives to be.

Yet again more mis-information about FPGAs

If it is related to the type of RAM card then I think it was something to do with the Videl RAM access and the fact the Atari 14MB card has so many DRAM chips that it loads the bus heavily. I used to use it with speckles until I got around to replacing the memory card.