Search found 305 matches

by stimpy
Fri Dec 12, 2014 5:50 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 128363

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 betw...
by stimpy
Mon Dec 01, 2014 10:01 am
Forum: For sale / Wanted
Topic: Free / Pay postage
Replies: 8
Views: 2283

Re: Free / Pay postage

Ah, it is 7. 1989
by stimpy
Sun Nov 30, 2014 8:57 pm
Forum: For sale / Wanted
Topic: Free / Pay postage
Replies: 8
Views: 2283

Re: Free / Pay postage

Hey LP, how do I tell?! Is it part of the ISBN number? Theres some extra pages loose (photocopies) that talk about the TT MFP
by stimpy
Sun Nov 30, 2014 1:36 pm
Forum: For sale / Wanted
Topic: Free / Pay postage
Replies: 8
Views: 2283

Free / Pay postage

Profibuch Atari Book, good condition. In German language but quite easy to understand.
by stimpy
Fri Nov 28, 2014 5:59 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 128363

Re: 4MB Upgrade & 16MHz Booster progress

by stimpy
Wed Apr 16, 2014 9:02 pm
Forum: Hardware
Topic: RAM limits in Atari machines and related
Replies: 32
Views: 6242

Re: RAM limits in Atari machines and related

@simbo Simple question: MC68000 accessing memory with only one bus cycle, 24 bits of address, 16 bits of data. How do you address a unique memory location in 138GB of memory? All done in one bus cycle Don't talk about paging or fancy addressing schemes requiring multiple bus cycles because you can a...
by stimpy
Thu Jan 31, 2013 11:25 pm
Forum: Hardware
Topic: Signal Noise
Replies: 45
Views: 4773

Re: Signal Noise

you want a pure sine to the fpga pin to ensure correct rise and fall times are also the same as the shifter I wouldn't advise to put a sine wave into a FPGA digital input. The slow edges can cause jitter, uneven duty cycle etc. /if you want to convert take a sine wave digital you might want to use ...
by stimpy
Sun Jan 27, 2013 1:13 pm
Forum: Hardware
Topic: Signal Noise
Replies: 45
Views: 4773

Re: Signal Noise

Try adding a bit of bulk capacitance near the converter chip too, something like 10uf ceramic.
by stimpy
Wed Dec 19, 2012 9:29 pm
Forum: Professionals
Topic: project idea: ECL signal adapter for TT-High...
Replies: 156
Views: 39094

Re: project idea: ECL signal adapter for TT-High...

I managed this with no external power source!

http://hardware.atari.org/photos/hitt_proto.jpg

I think a good ECL to TTL chip would work, on a decent PCB. Shouldn't be more than £20
by stimpy
Mon Dec 03, 2012 10:05 pm
Forum: Professionals
Topic: Falcon config. switches U46 & U47 readable from software?
Replies: 22
Views: 3929

Re: Falcon config. switches U46 & U47 readable from software

SoundDoctor wrote:
L122L123.jpg



I had one that looked just like this!
by stimpy
Mon Dec 03, 2012 10:00 pm
Forum: Professionals
Topic: Falcon config. switches U46 & U47 readable from software?
Replies: 22
Views: 3929

Re: Falcon config. switches U46 & U47 readable from software

simbo2 wrote:if you have or had a falcon without the DMA sound chip added {top right of the mainboard behind the dma socket is a plcc socket}
and you added one {an option} you need to enable it on U47 also


That PLCC chip is the ADC/DAC for sound, sometimes called CODEC, not the SDMA chip
by stimpy
Mon Dec 03, 2012 9:56 pm
Forum: Professionals
Topic: Falcon SRAM failed
Replies: 17
Views: 2127

Re: Falcon SRAM failed

there is 32K total 24 bit the 24bits are spread across the three addressed sram the individual ics are 8K 8bit wide here is the data sheet http://images.ihscontent.net/vipimages/VipMasterIC/IC/MOTO/MOTOD096/MOTOD096-5-114.pdf I am pretty sure they were 32 kiloybyte chips, organised 32Kx8. Seem to r...
by stimpy
Mon Nov 12, 2012 6:12 pm
Forum: Professionals
Topic: Possible new NetUSBee supplier
Replies: 7
Views: 4311

Re: Possible new NetUSBee supplier

..and that would be me. Go ahead and spread the fun :D I've had lots of emails since I stopped doing these so there is demand out there
by stimpy
Fri Nov 09, 2012 6:32 pm
Forum: Professionals
Topic: Problem with Eiffel
Replies: 26
Views: 3244

Re: Problem with Eiffel

Here:

http://didierm.pagesperso-orange.fr/eiffel-e.htm

I guess you take eiffel_i.hex from the root of the archive of v1.10.

I used to supply with Eiffel v1.04 as that was the current firmware.

Good luck! :cheers:
by stimpy
Fri Nov 02, 2012 8:31 pm
Forum: Professionals
Topic: dead Falcon. floppy LED illuminates same time as power LED
Replies: 14
Views: 4599

Re: dead Falcon. floppy LED illuminates same time as power L

i have tested the 5vcc on the keyboard controller chip and midi chip (just because they are the same chip, MC 6850P) and compared to a working falcon mobo which measures about 50 using a multimeter set at 200R the faulty board as pictured measures upto infinity, ie: goes of the scale Like I said, s...
by stimpy
Tue Oct 30, 2012 8:48 pm
Forum: Professionals
Topic: dead Falcon. floppy LED illuminates same time as power LED
Replies: 14
Views: 4599

Re: dead Falcon. floppy LED illuminates same time as power L

Probably getting 'back' powered from the TX or RX lines via a pullup/IC. LEDs can still operate with very little current.

I would still make sure you have power to the IC's around the keyboard port.

And yes, you can take power from nearby, I think I used to hook a wire from the 6850 ACIA nearby.
by stimpy
Sat Oct 27, 2012 9:41 pm
Forum: Hardware
Topic: STe high pitched whining sound when monitor cable connected
Replies: 21
Views: 2562

Re: STe high pitched whining sound when monitor cable connec

Can you post up a diagram of the adapter cable? Maybe there is a fine short on Atari Pin 8 in the adapter?
by stimpy
Sat Oct 27, 2012 10:36 am
Forum: Professionals
Topic: dead Falcon. floppy LED illuminates same time as power LED
Replies: 14
Views: 4599

Re: dead Falcon. floppy LED illuminates same time as power L

Yikes! It looks like Pin 4 of the connector has got hot as well. You will need to check that 5v is going to every part that it needs to go to. The Falcon is 4 Layer PCB I think, and the 5v for the keyboard is on an inner layer. Get looking at the schematics for the chips in the area and seeing where...
by stimpy
Fri Oct 26, 2012 11:53 am
Forum: Professionals
Topic: dead Falcon. floppy LED illuminates same time as power LED
Replies: 14
Views: 4599

Re: dead Falcon. floppy LED illuminates same time as power L

also on another note, where the keyboard plugs into the motherboard in front of the plug are 3 blue capacitors? with TDK 102 written on them, the one closest the egde of the mobo looks brownish on 1 side, certainly been some heat there They are filters for EMC purposes. I think middle (pin 2) is gr...
by stimpy
Thu Oct 25, 2012 8:14 pm
Forum: Professionals
Topic: Problem with Eiffel
Replies: 26
Views: 3244

Re: Problem with Eiffel

the fact the front end has no crc or other checking of a flash part resident makes it stupid You're welcome to write a new one based on the documentation on Didiers website. as for tight timings in asm ..??? eh??? whut?? this is total rubbish you can simply change the clock from 4mhz to 20mhz in th...
by stimpy
Tue Oct 23, 2012 12:06 pm
Forum: Professionals
Topic: Problem with Eiffel
Replies: 26
Views: 3244

Re: Problem with Eiffel

Kroll, is it one of the boards I did? Or a copy of that? There are a few versions out there. You would get the firmware from http://didierm.pagesperso-orange.fr/, it is a HEX file. Make sure the confiuration bits are correct but your friend with the programmer should know how to do. You may need an ...
by stimpy
Sun Oct 21, 2012 8:45 pm
Forum: Professionals
Topic: Problem with Eiffel
Replies: 26
Views: 3244

Re: Problem with Eiffel

if you flash it from a stupid front end in atari it wont tell you there isnt enough room in the pic16 looking at the flash parts available and there program rom size this is indeed the case I find this very disrespectful to someone who continues to support Ataris and has developed and still develop...
by stimpy
Sun Aug 12, 2012 1:21 pm
Forum: Professionals
Topic: NVRAM Surgery Success - Wait...what's this?
Replies: 21
Views: 3940

Re: NVRAM Surgery Success - Wait...what's this?

Check pin 11 on the 74F08 chip, is there anything connected to it? There should be! Does it link across to another pin on the chip?
by stimpy
Sat Jul 28, 2012 5:46 pm
Forum: Hardware
Topic: Time for a "SuperNova"?
Replies: 103
Views: 15894

Re: Time for a "SuperNova"?

Perhaps the best solution would be some universal board and a variety of cables that attach to different buses, VME, Megabus, 68000socket etc. The universal board would feature either an FPGA or perhaps a low cost ARM? With the ARM you have easy access to ethernet, USB, video port and anything else ...
by stimpy
Wed Jun 13, 2012 10:13 pm
Forum: Hardware
Topic: My STE keeps crashing
Replies: 39
Views: 5517

Re: My STE keeps crashing

Twice now it's crashed with no US or expansion slot stuff plugged in, both times just when I've inserted a floppy, literally as the disk clicked in, Is that a clue? When it has crashed the screen goes black but this time the LED doesn't seem to go as dim as before, which makes me think something wh...

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