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  1. Replies
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    That's probably because there's an autoset on the...

    That's probably because there's an autoset on the oscilloscope. I did an autoset on the clock, so it'll display 2 clockpulses @ 2 Mhz. The 600 KHz is much slower and showed the part that was low. As...
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    56171 Here's the sync signal. It keeps on...

    56171

    Here's the sync signal. It keeps on pulsing continuously.
  3. We recently acquired 2 pretty rare computers. An...

    We recently acquired 2 pretty rare computers. An Apple III with original profiler and Apple III+ screen:
    https://live.staticflickr.com/65535/48701289433_6a2c852bc8_c.jpg

    And this little machine,...
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    Yes, I've read your previous post and I just...

    Yes, I've read your previous post and I just noticed a mistake, the CPU gets 4.9v :). The RES get a 4.2v signal..

    Current situation (measured with oscilloscope)
    Pin 2 (RDY) High
    Pin 3 (clock 1...
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    the CPU looks like it's working. It gets a 4.2v...

    the CPU looks like it's working. It gets a 4.2v at the 5v line (which I think is a little low, other IC's get the correct 5v, like the memory). RSET is low, IRQ is pulsing, clocks are there..

    This...
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    Thank, I do have a logic probe, multiple...

    Thank, I do have a logic probe, multiple oscilloscopes (analog and digital) and enough stuff to get everything disconnected from a PCB (and connected as well) :P

    I have the schematics of the...
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    Reseat done of all IC's (nearly first thing),...

    Reseat done of all IC's (nearly first thing), memory card doesn't have reseatable IC's:
    https://live.staticflickr.com/65535/48743289433_036dfe7854_c.jpg

    This board has the full 256KB of memory....
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    Rescueing an Apple III

    Hello,

    I recently was very lucky to find a complete Apple III (serial 13198 ) with Profiler (serial 153461 ) for a decent price. We also want to show this machine hands-on in the...
  9. Thread: Apple II-clones

    by whizzi
    Replies
    13
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    3,393

    Interesting things here. Very interesting. It's...

    Interesting things here. Very interesting. It's clear there's no way to 'brand' these clones. However, I do have a clone which I know the brand of. It's a Dutch one called 'Bimex'. I got it from a...
  10. Thread: Apple II-clones

    by whizzi
    Replies
    13
    Views
    3,393

    Apple II-clones

    Hi,

    For some reason we received quite a lot of Apple II-clones in the HomeComputerMuseum lately. Some of them are obvious:
    https://farm2.staticflickr.com/1965/45558081631_c7e3404a71_c.jpg ...
  11. Replies
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    I have one too in the HomeComputerMuseum in the...

    I have one too in the HomeComputerMuseum in the Netherlands. Boxed. Also the printer (boxed) and an aquarius cassetterecorder.
  12. Oh jeez.. what do I have in the...

    Oh jeez.. what do I have in the HomeComputerMuseum

    I guess these 2 count:
    https://farm2.staticflickr.com/1923/45501374592_833bd88d96_c.jpg
    That's a (original) Sinclair MK14 and an Acorn System 1...
  13. Replies
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    4,481

    Thanks for the answer Larry. The memory is...

    Thanks for the answer Larry.

    The memory is socketed and in fact, I removed the entire memory from the board and it still starts up, acting exactly the same. It probably runs on it's videoRAM at...
  14. Replies
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    allright, I removed 1 tantalum capacitor that was...

    allright, I removed 1 tantalum capacitor that was shorting (marked C93) and after removal, the tantalum responded correctly to continuity (as in, one short beep and then nothing) and the board was...
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    I've been busy with other machines in the museum,...

    I've been busy with other machines in the museum, like an Amiga 1000 (had to create a Kickstart disk), fixing the Amiga 1081 monitor for it, setting up an Atari Mega ST, fixing our LAN-computers so...
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    It's maybe hard to see, but I'm actually...

    It's maybe hard to see, but I'm actually measuring the caps between + and - . Every beep = connectivity between those points which shouldn't be according to my knowledge (at least, not for tantalum...
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    well, I just tried and well, I think most of the...

    well, I just tried and well, I think most of the tantalums are shorting :/

    As well as these blue things, I assume they roughly to the same.
    short video

    So, I'm gonna order a whole bunch of...
  18. Replies
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    I don't know if this is normal (it's a video),...

    I don't know if this is normal (it's a video), but I made it a few days ago.

    https://farm2.staticflickr.com/1886/44622817502_bf7ce2d1af_b.jpg

    Fact is, the machine responds exactly the same as...
  19. Replies
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    Correct .. Monitor still shows memory starts at...

    Correct .. Monitor still shows memory starts at FF90 and ends at FFFF.



    Done that, swapped all IC's from ROW 2 to ROW 1, no difference (with only ROW 1 filled and settings to 16K)



    Yes,...
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    of course I did :). I just removed all memory...

    of course I did :).

    I just removed all memory (and set DIP to 4K memory), computer responds exactly the same.


    te 0000 0FFFF


    give all memory bad
  21. Replies
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    Allright, pictures (all are clickable and made...

    Allright, pictures (all are clickable and made with my Samsung S9+)

    Computer front view:
    https://farm2.staticflickr.com/1879/44582430512_83f38211bb_b.jpg

    Computer back view:...
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    Than I'll be making some very good photos then :)...

    Than I'll be making some very good photos then :)



    I'm sure there's plenty of documentation and information with people, maybe on attics or so. The biggest issue is that the Exidy was set...
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    We'll make a nice get together then, if you come...

    We'll make a nice get together then, if you come by car you are close to him and you can pick him up. Drive to Helmond and we'll have a party over there. I know some good and affordable B&B's nearby...
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    Thanks, I'm not afraid of opening stuff. That's...

    Thanks, I'm not afraid of opening stuff. That's basically my daily job and I already opened and cleaned the Exidy, S100 and drive :)

    I'll be at the museum tomorrow, so will do these actions. As...
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    The mainproblem is whenever I do a: go bc00...

    The mainproblem is whenever I do a:


    go bc00


    The Exidy falls into a loop op 9[] on the screen. With or without the S100 connected. Same error when I


    te fe90 ffff
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