Image Map Image Map

Search:

Type: Posts; User: Ruud

Page 1 of 12 1 2 3 4

Search: Search took 0.06 seconds.

  1. Replies
    5
    Views
    270

    The ROMs of the C64 have been disassembled very...

    The ROMs of the C64 have been disassembled very thoroughly by various persons, including me. So far I haven't seen anything that looks like a Easter Egg.
  2. My latest ZIP can be found here:...

    My latest ZIP can be found here: www.baltissen.org/zip/diagrom.zip

    What are the changes:
    - If something goes wrong during the 2 KB test, offending address and the bad bits are shown.
    - A...
  3. Replies
    5
    Views
    439

    In what way, to moist or to dry? To dry is not a...

    In what way, to moist or to dry? To dry is not a problem, too moist is.

    So far I have stored computers and other material in a little shed for years and, with one exception, no problems. The...
  4. I won't promise anything but I will have a look...

    I won't promise anything but I will have a look at it.

    But I already can tell you on forehand that you will loose the various counters. I need RAM for saving the counters and during the testing...
  5. Weird, at home things worked much better: first...

    Weird, at home things worked much better: first test goes fine second and later tests need about 35 seconds.


    Just had a look at the source and added a CLI right after the label where the ROM...
  6. Replies
    9
    Views
    609

    That is a nice explanation but I have seen a lot...

    That is a nice explanation but I have seen a lot of boards and AFAIR the DRAMs always have been soldered. So I'm curious how the soldering looks at the back of the board.
  7. A first result: 14 seconds. Much much faster than...

    A first result: 14 seconds. Much much faster than the first one. And I'm quite sure there is no bug :) No counter (yet) showing the progress.

    Edit: hmmm, bummer: first pass goes fine, second pass...
  8. Replies
    6
    Views
    467

    Oops, should be pin A10. Pin A0 does not exist so...

    Oops, should be pin A10. Pin A0 does not exist so no harm can have been done.
  9. Hallo allemaal, I have tried to put another...

    Hallo allemaal,


    I have tried to put another project on Github but it didn't work the way I liked it. And it took a lot of time to handle things, and I don't have that much free time. So I...
  10. Sorry, I sometimes completely forget to check my...

    Sorry, I sometimes completely forget to check my PM box. I already answered your PMs.

    For you and the others: I don't mind you emailing me regarding the Diagnostic ROM using my email address that...
  11. An idea just popped up: until now I'm testing the...

    An idea just popped up: until now I'm testing the memory in chunks of 1 KB. Why? It looks nice to see the progress of the counter, just like the memory test of various PCs. But I have this built in...
  12. OK, as I already mentioned in another thread I...

    OK, as I already mentioned in another thread I ran into bug in the memory test. In short: not all memory was tested. In fact, what ever value I chose, only 97 bytes were tested.

    I corrected that...
  13. Replies
    6
    Views
    467

    One thing you can do is to pull pin A0, IOCHRDY,...

    One thing you can do is to pull pin A0, IOCHRDY, to ground when powering up. If things are OK the address bus should output FFF0h and the data bus should output EAh (= jump far). If it does not, then...
  14. Replies
    41
    Views
    2,476

    Big bummer: I found a bug in the memory test. I...

    Big bummer: I found a bug in the memory test. I already found the test quite fast and I thought that were my programming skills. Checking to find a way to output the reason why the 2 KB test halted...
  15. Replies
    41
    Views
    2,476

    I just have to find some time to alter my...

    I just have to find some time to alter my diagnostic ROM as proposed above. The difference in the written and read value should point to the offensive bits.


    I recognize the problem. In the worst...
  16. Replies
    41
    Views
    2,476

    My BIOS tests counters and registers that can be...

    My BIOS tests counters and registers that can be written and then be read again. That the individual test went OK is not a guarantee that the refresh as a whole works fine. A damaged gate between two...
  17. Replies
    1
    Views
    251

    Project64 is online again.

    Hallo allemaal,

    Like me, a lot of people found out that C64.org, and thus Project64, has disappeared. To make a long story short: I found a mirror of it and after asking a bit around for takers, I...
  18. Replies
    7
    Views
    626

    May I ask, why? If I understand correctly,...

    May I ask, why?

    If I understand correctly, the program changes a piece of code of it self. The moment the single-stepper arrives at that part, this new code is just treated as any other code. And...
  19. Replies
    7
    Views
    673

    Windows for Workgroups 3.11 supports network. ...

    Windows for Workgroups 3.11 supports network.


    As mentioned before, there are cards around that support four floppy drives.
    Then please have a look at https://github.com/skiselev/floppy_bios
  20. Replies
    15
    Views
    1,522

    Regarding the video cable: so far I only used a...

    Regarding the video cable: so far I only used a "5-pins DIN plug to two cinch plugs" cable for the C64. It can be used for the VIC-20 as well. For the C128 I have one where the cable from the 5-pins...
  21. Replies
    0
    Views
    161

    Philips P3100 / Corona PC

    Hallo,

    I received a Philips P3100. I wasn't able to test it yet but according the previous owner it does start up. I am looking for information of this machine. There are several jumpers and...
  22. Replies
    54
    Views
    2,778

    OK. Thank you for the info. I will have a look at...

    OK. Thank you for the info. I will have a look at it.
  23. I'm Dutch, therefore: Hartelijk bedankt :)

    I'm Dutch, therefore: Hartelijk bedankt :)
  24. Replies
    5
    Views
    1,208

    Is it possible to make images of it, please?...

    Is it possible to make images of it, please? Thank you!
  25. Replies
    17
    Views
    1,130

    As John says: NASM. And I use Windows 7-32. I...

    As John says: NASM. And I use Windows 7-32.

    I just added the comment in my code that one should use NASM 2.11 or better. Thank you for pointing me to this!
Results 1 to 25 of 283
Page 1 of 12 1 2 3 4