w1k Posted January 30, 2013 Share Posted January 30, 2013 http://www.youtube.com/watch?v=cudIMrAtT8s wait for 0:40 what can be wrong? sometimes happened yesterday, whan i using IRC / contiki, atari restarts to dos, q-meg was blue, but only on moment, then will be all ok.. today everything wrong memory is good i turn off all carts, sio2sd, etc.. i try another keyboard.. that same.. Quote Link to comment Share on other sites More sharing options...
Marius Posted January 30, 2013 Share Posted January 30, 2013 perhaps a shortcut in your cartridge connector. what happens if you do not touch a key but you wiggle the atari itself. Quote Link to comment Share on other sites More sharing options...
w1k Posted January 30, 2013 Author Share Posted January 30, 2013 that same.. atari boot.. then 5-6 seconds and black screen.. sometimes run only self-test sometimes boot to the black screen START key not working.. sometimes work, but 90% not working.. Quote Link to comment Share on other sites More sharing options...
Marius Posted January 30, 2013 Share Posted January 30, 2013 What happens when you let your atari run without the keyboard? you write: I tried another keyboard. But did you try without keyboard. And then do the wiggle again. Quote Link to comment Share on other sites More sharing options...
w1k Posted January 31, 2013 Author Share Posted January 31, 2013 that same.. sometime boot to black, sometime normal unstable.. problem is somewhere in this four black buttons.. but where atari have 2 eproms.. seems like one only works, i can switch to another :/ + unstable Quote Link to comment Share on other sites More sharing options...
Fox-1 / mnx Posted January 31, 2013 Share Posted January 31, 2013 I'd try again with standard Atari O.S. The Q-Meg O.S. has many patches that may cause trouble. Quote Link to comment Share on other sites More sharing options...
Noelio Posted January 31, 2013 Share Posted January 31, 2013 You've got a LOT of mods there. Nice! Maybe one of these mod's solder needs to be redone. Hope you get it sorted out. Quote Link to comment Share on other sites More sharing options...
atari8warez Posted February 1, 2013 Share Posted February 1, 2013 Could the problem be "over modding" ?. With all these hardware mods we put in our Atari's the likelihood of something going wrong over the time is IMO 10 times higher compared to an unmodded machine..... Quote Link to comment Share on other sites More sharing options...
w1k Posted February 1, 2013 Author Share Posted February 1, 2013 hmm.. i have two eproms on atari.. one black button switch with eprom 1/eprom 2.. eprom 2 is like external cartridge.. when i used external ethernet cart, i forgot deactivate eprom 2.. maybe i make conflict and broke something.. atari next week go to service Quote Link to comment Share on other sites More sharing options...
w1k Posted February 6, 2013 Author Share Posted February 6, 2013 ..in service when will be repaired i write what happened Quote Link to comment Share on other sites More sharing options...
santosp Posted February 7, 2013 Share Posted February 7, 2013 (edited) The same thing on a friends XL machine, with 2 x 27C256 eproms piggy backed. Initially thought cause fail the selector switch, but finally the eproms was bad. Of course I will replace with one 27C512 for the 4 OS's. Edited February 7, 2013 by santosp Quote Link to comment Share on other sites More sharing options...
w1k Posted February 7, 2013 Author Share Posted February 7, 2013 -CPU, ANTIC, GTIA, POKEY, PIA, OS ROM, BASIC ROM - mounted into sockets -mmu, freedie replaced, 74LS138, 74LS08 replaced.. all eproms has saved with eprom reader.. all mods disconnected, but atari freeze in ram tesing - today infos from service. Quote Link to comment Share on other sites More sharing options...
guus.assmann Posted February 7, 2013 Share Posted February 7, 2013 Try small test in basic: 10 for x = 0 to 100000:?X;" ATARI":next x if this freezes before the end, and / or screen changes to yellow and brown, the CPU is faulty. (Halt line timing) This happens a lot with Mexico CPU's with 8224 mark if memory serves right. Quote Link to comment Share on other sites More sharing options...
w1k Posted February 8, 2013 Author Share Posted February 8, 2013 PIA, ANTIC, GTIA, CPU, OS ROM a BASIC ROM, FREDDY, POKEY - ok Address and data link - ok currently continuing repair Quote Link to comment Share on other sites More sharing options...
w1k Posted February 9, 2013 Author Share Posted February 9, 2013 hm, atari dont work.. :/ this is text from guy which repairs my atari So, like you, I remember, I disconnected everything in terms of switching EPROM (QMEG) Central with original OS ROM, further I removed the switches that turn on the internal Your CART - Top EPROM cartridge with the contents. I unplugged the power cord for the LED and ramdisk from the tow connector to connect SI2SD because of better accessibility to the board atarka. Ok .. Further the board has been interrupted connection MMU c.6 pin PB7 signal for what is memory MAP - use this extension RAM and a toggle team RAMBO / CS ... ok, further signal was interrupted / S5 pin # 12 of the MMU, which led to the flooding of the cart connector and signal / pin S4 C.19 MMU, who was just flooding led to the rear connector ... These views are along the connector adapted from esu 4k7 resistors will be connected to the +5 V and the other side resistors are connected to the signals / S4 a/S5 but on just the connector back and were connected to the switch number 2 discount (if divam atarko the front) that switches signals / S5 / S4 MMU either to flooding connector attached to the rear or the top of EPROM containing CART - signals are connected by the switches and diodes vedenene to pin 20 and pin 22 top EPROM 27256th Isostat switch # 3 is switched from left to address only the top EPROM, thus elected cart contents .. Well it is not currently on that clean sheet without any adjustments and expansion should go as classic atari 800x .. Ok, now my testing results: - PIA, CPU, ANTIC, GTIA, POKEY, FREDDY - are OK, tested on my atari - MMU what I gave to the other is also OK, tested on my atari - Equipped with 64kB RAM - DRAM 4164 8pcs left - are OK, tested in my atari, running as they should. - NE555 - timer to reset - it is also OK - TC4051 buffers for keyboard - also OK - 74LS138 and 74LS08 - the floods are OK, tested on my atari. Summary of tests - all integrated circuits remain intact and working normally as they should. Bracelets 64K survived as the original as well as extensions of 8pcs 41256 DRAM - and they are OK. Since the board has been interrupted signals MAP-pin c.6 MMU and PB7, c.12MMU pin connector for a cart - signal / S5 C.19 MMU pin connector for a cart - signal / S4, pin # 15 and pin MMU 20 + 22 OS ROM, so I can reuse these on the board after preskraboch restored, and I connected the spot for MMMU CO25952 signals A14 and FA14, FA15 and A15 of CAS signal for 64K RAM ... But frankly, all integration are OK, I measured data links and addresses, they were OK and no short circuits, but at home I do not have an oscilloscope, so I measured the waveforms, shame. So me of them all already only results that odisiel either some kind of capacitor, choke or resistor, or diode .. I measured diodes, are ok, I measured the resistors, flat look OK ... I have poodpajat caps gradually and thus their measured, since all are between GND and +5 V (that is, mostly) and can not be measured directly on the board (on par piplacka extra hours) .. Hmm, chokes suppose that they should be ok too, she did not look to be anything burned to PCBs or unsoldered .. Quote Link to comment Share on other sites More sharing options...
w1k Posted February 9, 2013 Author Share Posted February 9, 2013 (edited) I think not only the fact that Rise why you MLM monitor sometimes .. Heh, I'm a moron, I forgot that in QMEGU nemas SELF TEST, but in its place is exactly why my J MLM home SELF TEST and started up the MLM You sometimes ... interesting, so the cause is the same - caused something shutting BASIC ROM .. hmm .. strange .. Otherwise, frames are OK, but the OS ROM is OK and the BASIC ROM is OK .. only to replace the original OS ROM EPROM their 4os and moves SELF TEST On and after the OK to take place, otherwise the original OS ROM terminates Freeze ... hmm, something in the original OS ROM will probably run you crash the system with self-test still .. Edited February 9, 2013 by w1k Quote Link to comment Share on other sites More sharing options...
w1k Posted February 10, 2013 Author Share Posted February 10, 2013 finaly.. alive problem was with PIA.. Quote Link to comment Share on other sites More sharing options...
1050 Posted February 10, 2013 Share Posted February 10, 2013 finaly.. alive problem was with PIA.. Just curious, what was the chip make and number? I've never heard of a Hitachi 68B21 going bad, but that's what you should have had in there. At least originally. Quote Link to comment Share on other sites More sharing options...
w1k Posted February 10, 2013 Author Share Posted February 10, 2013 problem was with eprom 2 and external cart (ethernet) togerther.. signals S4, S5, RD4, RD5 fights in one bus.. btw. another atari with this mod death next day.. i try if it is PIA again.. Quote Link to comment Share on other sites More sharing options...
atari8warez Posted February 10, 2013 Share Posted February 10, 2013 problem was with eprom 2 and external cart (ethernet) togerther.. We should be careful with what we put in our Ataris ... glad the problem is fixed now... Quote Link to comment Share on other sites More sharing options...
w1k Posted February 10, 2013 Author Share Posted February 10, 2013 its not problem with carts.. i have two eproms in my atari.. one eprom is like ext. cart.. so.. one eprom + another cart = problem Quote Link to comment Share on other sites More sharing options...
atari8warez Posted February 10, 2013 Share Posted February 10, 2013 (edited) its not problem with carts.. i have two eproms in my atari.. one eprom is like ext. cart.. so.. one eprom + another cart = problem Yeah but they are upgrades aren't they?... that's what i meant.... any upgrade we put in the computer in some way affects the operation of the computer, the more we have, the more chances we create for headaches.... I prefer to upgrade one computer and leave the others stock (or maybe just a basic video or SIO +5v upgrade). So I only take a chance with one FrankenAtari Edited February 10, 2013 by atari8warez Quote Link to comment Share on other sites More sharing options...
w1k Posted February 11, 2013 Author Share Posted February 11, 2013 So, atari is in percect condition.. all solders are resolded and everything checked here is atari assembled back in action thanks go to marcel kolozvary Quote Link to comment Share on other sites More sharing options...
santosp Posted February 11, 2013 Share Posted February 11, 2013 (edited) Would like to add cause if you have look carefully my post #11, your friend would have been spared a looooooooot of trouble. So, when someone ask for help, maybe is better to see the writings! Unless of course you just want to play the little electrician with your Atari! Edited February 11, 2013 by santosp Quote Link to comment Share on other sites More sharing options...
w1k Posted February 11, 2013 Author Share Posted February 11, 2013 problem will not in eprom, but in pia.. signals S4, S5, RD4, RD5 fights in one bus.. Quote Link to comment Share on other sites More sharing options...
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