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xrbrevin

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Posts posted by xrbrevin

  2. Posted

    altho i cant recommend anything specifically as you are in a 120V country, over here amazon sells PSUs for guitar effects pedals that have the correct output for the AC Atari hardware.

    Maybe you could find something suitable on your local amazon?

     

    just found this:

     

  8. Posted

    On 12/20/2020 at 8:50 PM, DrVenkman said:

    sounds like a look at PIA is in order

    Thanks to all for the input, DrVenkman called it - the PIA! (Pesky Infantile Article? hehe)

     

    Heres how it went:

    • Desoldered the CPU, supplanted but no change
    • Multimeter'd all caps, resistors and transistors - nothing untoward found
    • Found a spare 74LS08 - piggybacked it on but no change
    • Desoldered PIA - replaced and it booted to missile command (no keyboard so this is correct), reset - into self-test. rebooted with keyboard - got basic, all carts work, SIO works!

    I have had a PIA casualty before, but luckily they are a universal off the shelf part.

     

    Great success! The machine is now playing demos from the Side2 cart 😎

    Now i have to tackle the keyboard internal dupont connector botches. Hopefully it will bring the faulty keys back.

     

     

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    • Like 6
    • Thanks 1

  10. Posted

    12 hours ago, mytek said:

    Sounds like SELECT is stuck on

    i think its more a case of garbage signals. i can boot to missile command if i hold down select, it doesnt if i dont.

    here is a pic of the shoestring ROM result, it appears this way immediately. i dont think it supports the XEGS directly as the silkscreen 'U' numbers are wrong but it does support the 2x DRAM chip 65XE (4464) which the XEGS also uses.

    I get same results with a homebrew GAL MMU and same results with a change of DRAMs.

    time to desolder the CPU..

     

     

    IMG_2255.JPG

  14. Posted · Edited by xrbrevin
    SuperSALT info

    thanks for the replies.

     

    1 hour ago, mytek said:

    I'm pretty sure you tried this, but just in case... did you try holding OPTION on power-up?

    alas, no joy. i dont even get the fart noise and not seen basic thus far. With no (diag-spec) cart i just get a black screen. SIO devices do not respond.

     

    30 minutes ago, Nezgar said:

    Any difference in behaviour with/without keyboard attached?

    yes, this is an odd thing - with keyboard attached it will boot to missile command. if i start a game the cursor just goes to top-left regardless of whether a joystick is connected (pokey issue?). there is a low-tech historic repair on the keyboard cable that i have not tidied up yet tho.

     

    The first boot up went straight to memory self test. it got past half way with no errors and then reset itself to a black screen. Ive never managed to get back into memory test since.

    The SALT cart shows RAM: 40k, TIA: PAL, ROM: ERR, NTSB: ERR. The 40k tested fine.

     

    SuperSALT flashes up a brief orangey-brown screen with SYSTEM ERROR F4. Sometimes it will emit a high pitched tone.

     

    I have swapped out thus far: OS ROM, MMU, Freddie, 2x DRAMs. Im wondering if there is an addressing issue with the CPU but its not socketed. (pesky XE desoldering..!)

     

    I'll get that Shoestring ROM burnt and see what it does. Many thanks for the link! Just gotta wait for the UV eraser to work its magic.

     

  19. Posted · Edited by xrbrevin
    image rotation

    i know some of us have other 'underling' consoles so i thought i'd post an image of my newly re-cased sega game gear

    i chose the colours based on my appreciation for the '70s styling of the 400 - hope you like it!

     

     

     

    IMG_2232.JPG

  20. Posted

    4 hours ago, Wrathchild said:

    Here's hoping xrbrevin snarf'd it and its gone to a good home

    alas, not me - my deskspace is ever-shrinking and the blackbox demands too much turf!

    i agree, it has been superseded in recent years by other devices so i think the demand is a more narrow market. interesting to see and discuss tho

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