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dhe

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Posts posted by dhe

  1. Posted

    Insane One,

     Thanks for the tips, while I had checked for continuity (where there shouldn't be any on adjacent pins), I hadn't thought to test to make sure Address and Data lines (shared) between the two chips checked out. I did that, and they do.

     

     When I started being active in the group, I read the threads related to the TL866 as luck would have it, yesterday Bob mentioned testing 99/4a VRAM DRAM. Then I got to thinking, I wonder if the TL866 would test 6264 SRAM - sure enough it would. I put in chip 1, test - good, put in chip 2 test - Bad Data Bus, retested both chips, with the same result.

     

      Bad chip tossed, I have a couple of more chips coming in. I will test before trying them, and note which chip goes in which socket. I have my fingers crossed.

     

     

     

    • Like 1

  2. Posted

    Hi,

      Mizapf is kind enough to let us know when new MAME is released and what has changed in the Geneve/99/4a emulation.

     Can someone point me to the release notes for MAME, so I can keep up with anything that might have changed in the CC-40 emulation, as I'm always hoping, HEXBUS emulation will move forward, I know Mizapf isn't responsible for the CC-40 emulation.

    Thanks,

    Dan

     

  5. Posted

    So following docs, discussed here:

    https://atariage.com/forums/topic/271504-internal-memory-upgradethe-compact-computer-40-cc40/?tab=comments#comment-4391268

     

    I used my new to me Hakko desoldering gun and new to me, no clean up soldering flux, made de-soldering very easy.

    I checked each pad and trace for damage - none.

     

    I then soldered in new sockets, checking both the top of the board and bottom of the board for any solder bridges (none).

    I made sure each joint was shinny.

     

    When I put everything back together, the little CC-40 wouldn't boot. It did get power as half of the display darkened a bit.

     

    I didn't know if the CC-40 would boot with out either of those two memory chips, but I pulled them both out of the socket. Looking at each memory chip after being pulled from the socket, I inspected all pins. There where no bent pins.

     

    I know a solder bridge can keep a machine from booting, but if there was a solder bridge, removing the chips would still leave that bridge in place, as would not having a pin connected.

     

    Some, I'm leaning towards a bad chip or chips? What do those of you with electronic knowledge think? What should be my next step in trouble shooting?

     

    Before, the board, After and dachips.

     

    before.jpg

    withchips.jpg

    after_removal.jpg

    dachips.jpg

  9. Posted

    I was playing some old games on my finalgrom and I noticed an oddity with my now ancient TI joysticks.

    Seems like at the start of a game, the fire button was detected every time pressed, even with very little force applied.

    A few seconds in to the game.. donkey kong, parsec, ti invaders is would fail to detect fire, but still pick up the directional presses.

     

    Same games, same console, etc, but I hooked up my amiga joysticks for the TI, the problem totally disappeared.

     

    I took some de-ox it to the TI joysticks (connector and pads), but the problem remained the same.

     

    Anyone else seen this behavior?

     

    Thanks,

    Dan

     

    • Like 1

  17. Posted

    The Brewing Academy's final grom comes with a case, it's not as nice (IMO) as the COREi, but after a little work with a Dremel tool, it works, but the label doesn't line up well with the indicator LED.

    I'm afraid, that you might have to eat the cost of the nicer COREi case and use the standard issue one - if I understand your question.

    Also, I like the arcade shopper final grom a little better, because it seems odd to insert the SD card upside down.. But once it's in, it's in.

    One other option, maybe you can send you Brewer Academy final grom to COREi, and he can build one for it?

    It would be worth it to me to retro-grade my two Brewer Academy Case, that actual cartridge itself works great.

     

  19. Posted

    I have two TI Transformers that BUZZ when they are plugged in, and REALLY BUZZ when you turn on the console.

    Being the elder geek that I am, I said - "That doesn't sound good!"

     

    So my question is, can these be easily repaired?

    Is there a better solution today, then these 40 year old transformers that can be easily implemented?

     

    thanks!

  21. Posted

    arcadeshopper for the WIN!

    Both consoles, are older black and silver.

     

    Just so we could eliminate any talk of final grom, I pulled my original TI module (PHM3112).

    Parsec will start, but the screen pretty quickly becomes corrupt, so I'm guessing a memory chip.

     

    What would be the best path to figure out what memory chip, TI Diags test memory, but I get the feeling memory, is only the scratchpad.

     

    • Like 2

  23. Posted

    I have a final grom. One of my consoles will play moon patrol and one will not.

    On the defective console, moon patrol will start, but the opening sound, sounds kind of 'tinny', then in crashes.

     The defective console will pass TI diagnostics and play TI Invaders, run a basic program.

     I'm thinking in might be a bitmap mode thing?

  24. Posted

    >The Geneve II project stalled and has not been picked back up. No word on any plan.

    I'd guess arcade shopper was referring to the stalled Geneve II project that was happening in the UK about eight years ago. My brain is fuzzy as to the name of the gentlemen working on the project, as I only remember reading his name once in the UK newsletter.

     

     

    • Like 1
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