xrbrevin
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Posts posted by xrbrevin
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it would be a great little device if, like you say it could do over disk 100 images
is there any way of contacting the designer to see if he can make a Mk II version?
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try to read the disks with another drive if you can
the alternative is to record the games onto working blank disks, remove the actual disks from the sleeves by breaking the bond. swap them over then glue the flap back down
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there are many options depending if you have soldering skills, do you want extra ROM slots too..
check the profile of user: @tf_hh
check lotharek's site
a device called 'antonia' replaces the CPU and gives you selectable RAM and ROM versions/types
there are others that give you a fixed 256k, 320k, 576k, 1088k but the more modern upgrades allow you to select between any of these.
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there is a reset switch detailed in the attachment but i dont know how itll affect the Happy mod
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Such a sad loss for the community, his contributions were immeasurable and will not be forgotten.
Best wishes to his friends and family.
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a tantalum one should be ok
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I have a TL866 and ive occasionally used that feature. altho, it has never found a bad 74LS thus far so im unsure if its accurate...
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21 minutes ago, videofx said:Do you happen to have the link for the video cable on Amazon? My video cable with Video produces jailbars
Thanks!
Might be worth trying another screen first if you can, just in case the cable is good
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Thanks for the suggestions. I have a logic probe and the back of the RAM board is accessible so i'll have a mooch about.
I thought maybe i would take a macro photo of the PCB and then zoom in on the computer to check if any traces are in amiss.
On the 32k board I did some continuity testing across the DRAMS and all lines appear to be behaving as they should. All address lines are linked, -5v 12v 5v and GND are linked with no crossovers. RAS and CAS lines are linked but only on every other chip, i assume this is due to it being 2x16k on a single board.
If the worst comes to the worst, i will salvage the 4116s and make my standard Atari RAM board into a 32k one. These '80s aftermarket PCBs dont have a silkscreen and the traces are less than robust!!
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Can anyone give me any pointers as to how to diagnose a 400/800 RAM board? I have a 48k one and a 32k one and i feel ive done all that i can with them but I just keep getting the red/brown screen.
ive checked traces for continuity where there should be and shorts where there shouldnt be. Ive checked the 4116 DRAMs work in a standard board and ive checked that the 4164 DRAMs work in an XL.
The 48k one receives it's SEL4, SEL5, A14 and A15 connections from the Z103 socket (via a small piggyback PCB) and it also gets the RD4 and RD5 from the cartridge socket (via 2x wires).
Does anyone know of a procedure for troubleshooting? Im wondering if the 74LS glue logic is at fault.
cheers!
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2 hours ago, blacka013 said:Hi All,
where can you get these please?
Regards
Tracopower is a good make:
5v:
12v:
you can also get cheaper ones from china if you like
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they work fine, ive done a few now and as Mytek said, no heat! 😎
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you should be fine, ive used files from atarimania without issue
give it a go!
here is another great site - with a "download all" option!
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3 hours ago, MrFish said:Interesting. Maybe someone else has seen one like it before.
Have you tried doing anything to get it working? There's a lot of solder on those chips that might develop a problem...
i plan to do an AV mod to the machine first, then i will tinker with the 32k board. i will reflow all contacts and if that fails i will desolder the ICs and test them in a (socketed) 16k board
shouldnt be too complicated to get it running, no other mods are needed on a 400 unless you exceed 32k.
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yes good idea, and use tweezers to lift out the remains of the cut pins
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Be patient when desoldering XE PCBs - make sure the chip pins are loose before you prise the chip up.
Some were built at a lower cost and their traces can easily lift.
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here is an unbranded 32k board using 16x 4116 chips. I obtained it inside a 400 but sadly it doesnt work.
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i refer to this type as: "a can't help getting hit game"
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an OS ROM fault can be diagnosed by booting a star raiders cart - if the game works then the OS ROM is moody
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ah apologies, i misread your post. i thought you were referring to his AC power supply, not a theoretical DC one
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6 hours ago, BillC said:A 9.5VDC power supply would not supply any power for the -5VDC rail and the voltage doubler circuit for the +12VDC rail would also not work. Both of these voltages are required by the DRAM chips used in the original 400/800 8/16kB memory cards.
this is why the 400 and 800 have an internal power board.
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would look good in a 3d printed case - in beige and orange!! 😎
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sorry, couldnt resist! 😛
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Turbo Freezer 2011 - Usage / Info
in Atari 8-Bit Computers
Posted
Shrike! that is a coincidence 😮