Search found 305 matches

by stimpy
Thu Dec 07, 2017 3:00 pm
Forum: MiSTer
Topic: Minimig and Hybrid emulation.
Replies: 26
Views: 8782

Re: Minimig and Hybrid emulation.

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?
by stimpy
Thu Nov 30, 2017 11:08 am
Forum: MiSTer
Topic: Minimig and Hybrid emulation.
Replies: 26
Views: 8782

Re: Minimig and Hybrid emulation.

...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.
by stimpy
Wed Nov 29, 2017 1:59 pm
Forum: MiSTer
Topic: Minimig and Hybrid emulation.
Replies: 26
Views: 8782

Re: Minimig and Hybrid emulation.

I'm well aware the diferences between FPGAS and prcoessors :o 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...
by stimpy
Tue Nov 28, 2017 7:48 pm
Forum: MiSTer
Topic: Minimig and Hybrid emulation.
Replies: 26
Views: 8782

Re: Minimig and Hybrid emulation.

Out of interest, why not just use the arm to run an emulator? The emulators are cycle accurate are they not?
by stimpy
Thu May 18, 2017 7:53 pm
Forum: Hardware
Topic: Looking for source for 1.27mm pitch headers
Replies: 12
Views: 2849

Re: Looking for source for 1.27mm pitch headers

Samtec?
by stimpy
Wed Apr 05, 2017 3:17 pm
Forum: Chat forum [ENG]
Topic: New addition to the collection
Replies: 26
Views: 6776

Re: New addition to the collection

Looks like its had audio modifications done too.
by stimpy
Thu Mar 02, 2017 12:06 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 126990

Re: 4MB Upgrade & 16MHz Booster progress

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...
by stimpy
Tue Feb 28, 2017 10:55 am
Forum: Hardware
Topic: Available open 68000 cores ?
Replies: 18
Views: 4085

Re: Available open 68000 cores ?

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...
by stimpy
Mon Feb 13, 2017 2:58 pm
Forum: Hardware
Topic: BAD DMA - Myth or fact ?
Replies: 97
Views: 34296

Re: BAD DMA - Myth or fact ?

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.
by stimpy
Sun Jan 29, 2017 9:13 am
Forum: Professionals
Topic: Why so hard to de-solder some parts?
Replies: 7
Views: 1798

Re: Why so hard to de-solder some parts?

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...
by stimpy
Tue Nov 29, 2016 3:24 pm
Forum: CosmosEx
Topic: Data corruption with CosmosEx SD card (Falcon/SCSI)
Replies: 99
Views: 35600

Re: Data corruption with CosmosEx SD card (Falcon/SCSI)

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...
by stimpy
Sat Oct 15, 2016 6:18 pm
Forum: Hardware
Topic: Amiga 600 Vampire 2 accelerator board
Replies: 106
Views: 27245

Re: Amiga 600 Vampire 2 accelerator board

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 gr...
by stimpy
Wed Aug 24, 2016 10:13 am
Forum: Applications
Topic: Magic 6.20 page
Replies: 81
Views: 26565

Re: Magic 6.20 page

Install NVDI?
by stimpy
Thu Jul 28, 2016 7:48 am
Forum: For sale / Wanted
Topic: HD-Driver v7.8 for sale
Replies: 10
Views: 5316

Re: HD-Driver v7.8 for sale

:D 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 :)
by stimpy
Wed Jul 27, 2016 7:34 pm
Forum: For sale / Wanted
Topic: HD-Driver v7.8 for sale
Replies: 10
Views: 5316

Re: HD-Driver v7.8 for sale

Free now, just pay postage, or its going in the bin!
by stimpy
Mon Jul 04, 2016 5:34 pm
Forum: Hardware
Topic: STE BAD RAM (not bad simms)
Replies: 44
Views: 8995

Re: STE BAD RAM (not bad simms)

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.
by stimpy
Tue May 03, 2016 3:33 pm
Forum: Hardware
Topic: CPU speed discrepancies oddity
Replies: 65
Views: 15915

Re: CPU speed discrepancies oddity

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. :?:
by stimpy
Thu Apr 21, 2016 12:17 pm
Forum: Hades / Milan
Topic: Xilinx XACT software for Hades chips
Replies: 3
Views: 7555

Re: Xilinx XACT software for Hades chips

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
by stimpy
Tue Apr 05, 2016 3:30 pm
Forum: For sale / Wanted
Topic: HD-Driver v7.8 for sale
Replies: 10
Views: 5316

Re: HD-Driver v7.8 for sale

Bump, £10 including postage.
by stimpy
Sun Mar 20, 2016 2:30 pm
Forum: Hardware
Topic: What about an embedded web server?
Replies: 21
Views: 6927

Re: What about an embedded web server?

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...
by stimpy
Sun Mar 20, 2016 8:31 am
Forum: For sale / Wanted
Topic: HD-Driver v7.8 for sale
Replies: 10
Views: 5316

Re: HD-Driver v7.8 for sale

£10 or 15 euros seems reasonable.
by stimpy
Sat Mar 19, 2016 6:25 pm
Forum: For sale / Wanted
Topic: HD-Driver v7.8 for sale
Replies: 10
Views: 5316

HD-Driver v7.8 for sale

Not sure what its worth, original sales invoice from Systems Solutions 1998! 8) Offers, can take Paypal and ship world wide.

IMG_20160319_171718.jpg
by stimpy
Thu Mar 17, 2016 10:14 am
Forum: Hardware
Topic: Homebrew Atari ST ?
Replies: 86
Views: 19599

Re: Homebrew Atari ST ?

joska wrote:
stimpy wrote:Yet again more mis-information about FPGAs :shrug:


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.
by stimpy
Wed Mar 16, 2016 2:27 pm
Forum: Hardware
Topic: Homebrew Atari ST ?
Replies: 86
Views: 19599

Re: Homebrew Atari ST ?

Yet again more mis-information about FPGAs :shrug:
by stimpy
Fri Feb 26, 2016 5:48 pm
Forum: Professionals
Topic: Falcon Mod Resurrection.
Replies: 21
Views: 6518

Re: Falcon Mod Resurrection.

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.

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