Search found 305 matches

by stimpy
Fri Feb 26, 2016 10:13 am
Forum: Professionals
Topic: Falcon Mod Resurrection.
Replies: 68
Views: 17898

Re: Falcon Mod Resurrection.

I used to used the Phantom in my Falcon along with the 44.1kHz clock. Never had problems, super stable. Looks a bit messy but actually quite neat with a solid ground plane. Only issue was the standard Atari 14MB ram card would make speckles on the monitor. The 4MB was OK or a replacement 72pin simm ...
by stimpy
Mon Feb 08, 2016 8:17 pm
Forum: News & Announcements
Topic: Atari World & Atari Computing Mags going online
Replies: 49
Views: 16163

Re: Atari World & Atari Computing Mags going online

I used to have an Atari Computing CD, can't remember what was on it but I had a feeling it was all the disks and the mags in electronic format.
by stimpy
Thu Dec 17, 2015 9:13 am
Forum: Hardware
Topic: Blitter in FPGA
Replies: 46
Views: 12547

Re: Blitter in FPGA

Spartan 6:
Slice Registers: 566
Slice LUTs: 1078
Spartan 3:
Slice Flip Flops: 579
4 input LUTs: 1756
worth checking on Altera devices too...
by stimpy
Thu Dec 17, 2015 8:48 am
Forum: Hardware
Topic: Blitter in FPGA
Replies: 46
Views: 12547

Re: Blitter in FPGA

Exxos, I've used those quickswitches before and they are super cheap really. Hoping the old 5v chips can drive that current on an already loaded/large data bus is a recipe for disaster IMO, I'm surprised by that application note! 8O
by stimpy
Tue Dec 15, 2015 10:13 am
Forum: Hardware
Topic: Blitter in FPGA
Replies: 46
Views: 12547

Re: Blitter in FPGA

that board has "The EPROM chip adopt EPCS4 with 4Mbit". Is it ok? I see really cheap Altera Mini Development Board - $26: http://www.amazon.com/RioRand-EP2C5T144-Altera-Cyclone-Development/dp/B00LEMKR92 Yes, sure. However, you'll probably need some additional external circuitry to hold the ST in re...
by stimpy
Tue Dec 15, 2015 9:38 am
Forum: Hardware
Topic: Blitter in FPGA
Replies: 46
Views: 12547

Re: Blitter in FPGA

Not up on the Altera stuff but that looks like it would do the job. Just need some bus switches for 5v tolerant.http://www.idt.com/products/memory-logi ... uickswitch
by stimpy
Tue Dec 15, 2015 9:01 am
Forum: Hardware
Topic: Blitter in FPGA
Replies: 46
Views: 12547

Re: Blitter in FPGA

I had a quick look at the suska VHDL and you'll see two top files, one for embedding as a "SOC" and one for standalone. It shouldn't take more than 30 mins to get the VHDL built for whatever FPGA. You could look at Spartan 3AN as they have embedded flash to store the configuration...or you could loa...
by stimpy
Mon Dec 07, 2015 10:23 am
Forum: Hardware
Topic: Falcon FPU overclocking results
Replies: 45
Views: 12494

Re: Falcon FPU overclocking results

And here for FPU stuff:

http://www.powerphenix.com/ct60/english/Fitt_sold.htm

Think its the SDMA.
by stimpy
Sun Dec 06, 2015 6:16 pm
Forum: Hardware
Topic: Falcon FPU overclocking results
Replies: 45
Views: 12494

Re: Falcon FPU overclocking results

Seem to remember it was used somewhere else and the socket was the only way to do it. I know joska used to have a good guide on his website, but that was ~10 years ago 8O

Edit: here : http://atari.nvg.org/fpu/
by stimpy
Wed Dec 02, 2015 10:21 am
Forum: Hardware
Topic: Falcon FPU overclocking results
Replies: 45
Views: 12494

Re: Falcon FPU overclocking results

dml wrote: Also - the 16mhz clock performance difference is probably to do with drifting phase. The FPU device supports async bus activity, but it's timing behaviour when that occurs may not be ideal.
I was going to say, try inverting the clock from the MB too.
by stimpy
Wed Nov 11, 2015 8:03 pm
Forum: MiST
Topic: MiST demo compatibility ?
Replies: 37
Views: 13819

Re: MiST demo compatibility ?

I'd be interested to know if anyone has tried the Hallucinations demo by RG on a Mist. I know a fair bit about the Suska code and its design was to exactly replicate down to the logic level each part of every chip in the Atari ST. Therefore, its "emulation" should be 100%. In fact, you can pick out ...
by stimpy
Sat Oct 31, 2015 10:03 am
Forum: News & Announcements
Topic: New Atari PSU in the making
Replies: 130
Views: 63197

Re: New Atari PSU in the making

The hardest parts were the inductors. This always drives me nuts as there are so many terrible types on the market that I could write a book on it it, in fact I think I did write a paper on it at some point :lol: With physical size constrictions and cost being a factor, some small compromises had t...
by stimpy
Tue Jul 07, 2015 1:18 pm
Forum: Hardware
Topic: Replacement for and Ajax info needed
Replies: 12
Views: 4167

Re: Replacement for and Ajax info needed

You may need a hotter soldering iron to remove them.. Stuff where damage to PCB isn't a problem, I would use a gas soldering iron which comes with "blower" type nozzles. This way you can heat up all 3 pads and just pull it out with pliers. I have a hot air station so I can just blow solder out of t...
by stimpy
Tue Jun 23, 2015 10:21 am
Forum: Hardware
Topic: Buffering the cartridge port
Replies: 36
Views: 14745

Re: Buffering the cartridge port

simbo2 wrote: any 244 will work
Warning, not all 74 logic series at for 5v logic.

Also, the 245 is usually better to use than the 244 as the pinout makes more sense for routing. 8 in one side, 8 out the other side.
by stimpy
Fri May 08, 2015 3:57 pm
Forum: Chat forum [ENG]
Topic: Atari Sparrow ?
Replies: 17
Views: 8824

Re: Atari Sparrow ?

Interesting to see how different it is to a Falcon in terms of layout. Someone made a mistake with the placement of the CODEC :D I don't think it would be too bad trying to get it working, as long as the custom ICs are OK.
by stimpy
Fri May 08, 2015 2:43 pm
Forum: Hardware
Topic: 4 Bombs on Falcon when LOG3 is Connected
Replies: 16
Views: 5348

Re: 4 Bombs on Falcon when LOG3 is Connected

I thought the bombs was just displayed based on what exceptions/trap were hit by the CPU, in this case it could be Illegal instruction? Sounds like its quite unstable in general. Clean all contacts on socketed chips and maybe looking at the PSU next. Oh and check if there is a fuse that supplies pow...
by stimpy
Sat Mar 14, 2015 12:09 pm
Forum: Hardware
Topic: A Hades 040 and its problems
Replies: 11
Views: 4712

Re: A Hades 040 and its problems

Flux Pen, hot air gun, some thin metal for shielding plastic from heat and perhaps some leaded solder paste.
by stimpy
Thu Feb 19, 2015 6:54 pm
Forum: Hardware
Topic: New board: MonSTer
Replies: 591
Views: 216320

Re: New board: MonSTer

How far out of the cart port do they sit? I was looking at NetUSBee but because my machine is towered the motherboard is too close to the bottom of the chassis. I'd have to make some serious modifications. If I can hotwire one in I'd be interested in eathernec. One way is to cut the outer row of pi...
by stimpy
Thu Feb 12, 2015 6:13 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 141995

Re: 4MB Upgrade & 16MHz Booster progress

I'd really stay away from buying any components from China. If you can't get them from Digikey, Mouser, RS or Farnell then try something else.
by stimpy
Thu Jan 15, 2015 12:06 pm
Forum: Hardware
Topic: Repairing an old 520STm
Replies: 16
Views: 3701

Re: Repairing an old 520STm

Have you got the copy of ST Internals with the TOS listing in the back? I spent many hours single stepping hardware through that code, and yes it uses BERR to work out the memory size. The problem could be somewhere else, can you grab the address before the crash and inspect TOS code to see what it ...
by stimpy
Mon Jan 12, 2015 9:31 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 141995

Re: 4MB Upgrade & 16MHz Booster progress

I'd suggest maybe looking at the Xilinx XC95 series CPLDs, they have a lot lower propagation delays and more logic gates. However I don't know if they still make the 5V stuff, one reasons why looking at 3.3v logic might be good. For running signals from gates across the board, do as you are doing us...
by stimpy
Sun Jan 11, 2015 8:43 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 141995

Re: 4MB Upgrade & 16MHz Booster progress

How about providing a 68SEC000 processor on the board too? You'd need to run some bi-directional buffers between it and the ST, but you'd be able to make use of more modern chips. I'm thinking additional SRAM for dedicated fastram and perhaps parallel flash for TOS 2.06/patched magic etc. It's also ...
by stimpy
Sat Jan 10, 2015 6:36 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 141995

Re: 4MB Upgrade & 16MHz Booster progress

I strongly suspect that GLUE is just using pure combinatorial logic to generate it's DTACK signal... Interestingly, I took a look at Wolfgang Förster's VHDL implementation of GLUE for his SUSKA project and he just uses combinatorial logic as well. You're spot on. Transistors cost a lot so any way t...
by stimpy
Sun Dec 21, 2014 10:44 am
Forum: For sale / Wanted
Topic: Free / Pay postage
Replies: 8
Views: 2593

Re: Free / Pay postage

Hi, sorry I didn't see this. Yes I'll sort something out, bit busy at the moment with Christmas but I'd prefer it go somewhere useful rather than the paper recycling bin! Sometime between Xmas and New year should be good for me. Oh, and its Bristol now so probably easier than where I was!
by stimpy
Fri Dec 12, 2014 7:46 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 141995

Re: 4MB Upgrade & 16MHz Booster progress

Just to chip in, I seem to remember looking at this and worked out that AS and DTACK need intercepting to synchronize the 68000 when running async to the system. And the 6800 series stuff needs a new clock generated and again, resyncing a few things. What you need to do is align the data moving bet...

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