Image Map Image Map

Search:

Type: Posts; User: Twospruces

Page 1 of 4 1 2 3 4

Search: Search took 0.01 seconds.

  1. George that would be awesome. Sounds like you...

    George that would be awesome.
    Sounds like you know how to make MCPDIAG run interations; I didnt see anything that let me do that, but I saw an iteration count.
    Anyhow I would be very interested...
  2. great find thanks! Good to know my use case on...

    great find thanks! Good to know my use case on Z171 isn't necessarily defective. The thought of disassembling MCPDIAG is unappealing. After reading that application note for 8087, it seems like...
  3. Thanks ChuckG. Got same results. So I have a...

    Thanks ChuckG. Got same results. So I have a Z171 with coprocessor that runs applications apparently fine, added 150mA to the external power supply at 14.7V (so about 2W at the chip), and yet fails...
  4. thanks for this. this is a better version than I...

    thanks for this. this is a better version than I had, and it is more descriptive. I still fail one test..."environment test".

    "tests the 80 bit wide internal math coprocessor register stack".
    ...
  5. Interestingly, MCPDIAG fails the last test......

    Interestingly, MCPDIAG fails the last test... INTEGRITY. wonder what that's about... maybe I don't care, MATLAB is working.
  6. woohoo! found the problem! the handshaking...

    woohoo! found the problem! the handshaking signal BUSY <---> TEST was being held at +5V by the motherboard.... needed to bypass that, and VOILA! 17.37x IBM XT speed on math. 115 k Whetstones on...
  7. Thanks. Well it feels like bad hardware a bit. ...

    Thanks. Well it feels like bad hardware a bit. If any code hits the FPU , system hangs. Maybe I have a bad signal somewhere.
  8. thanks, found the files. Looks like the patch...

    thanks, found the files. Looks like the patch (merely?) flips bit 1 of BIOS BDA 0040:0010 to say "coprocessor detected".

    I had already tried this using debug... no luck.
    It is possible that my...
  9. I'm attempting to install an 8087 into a Zenith...

    I'm attempting to install an 8087 into a Zenith Z-170.

    I have what I think is a valid hardware setup now. It is much like what is illustrated in the iSBC Multimodule Math schematic with these...
  10. ....well I wonder if xt workalike boards without...

    ....well I wonder if xt workalike boards without 8087 sockets may have implementation details that prevents a simple upgrade...

    Regardless since NMI seems to be a catch all for "pending doom "...
  11. NMI circuitry is documented for the IBM XT. It...

    NMI circuitry is documented for the IBM XT. It may not be the same circuit on other machines. NMI is pinned to vector 2 in the table in the iPAX 86/88 user manual and so I assume that all "pending...
  12. Awakening this old thread yet again. Seems to me...

    Awakening this old thread yet again.
    Seems to me that the trickiest thing about adding an 8087 where there is no socket for it, is that you need to know (1) how to connect the INT output from 8087...
  13. Replies
    0
    Views
    64

    Corona PC docs and software

    Not my ad, saw it and thought it was worth sharing here.
    ...
  14. Replies
    30
    Views
    1,110

    Another suggestion- Pull and reseat the M100...

    Another suggestion-
    Pull and reseat the M100 Main ROM chip.
    Pull and reseat any RAM modules that are socketed.

    If the power supply is working, but being shutdown erroneously due to poor memory...
  15. Replies
    30
    Views
    1,110

    I think it is really hard to sort out AC behavior...

    I think it is really hard to sort out AC behavior with a DVM. Ground isn't the best reference in this case. I'd use the emitter as reference.

    M28 pin 13 is.. what voltage?

    The cpu can shut...
  16. Replies
    24
    Views
    507

    I see 2 used ones in Canada at the current time...

    I see 2 used ones in Canada at the current time for 150 and 200$ CDN, which is quite a bit less Euro. ...
  17. regarding oscilloscope- Well, I have used and...

    regarding oscilloscope-
    Well, I have used and still use 80s vintage Tektronix. I've always thought they were really good.
    Current scope is 2430 which I got for 125$.
    I have a USB scope from...
  18. Just a short (maybe final) note on this thread. ...

    Just a short (maybe final) note on this thread.

    All of the issues with usability of this card that I am aware of have been resolved.
    - the drive detection issue was resolved with a small patch to...
  19. hey, quick update. swapping MSDOS 3.3 into the...

    hey, quick update.
    swapping MSDOS 3.3 into the machine, removing Zenith DOS 3.3 Plus, seems to have resolved this. It works like it is supposed to now. Something strange with that. Anyhow stock...
  20. QQ for those who understand how to compile XUB- ...

    QQ for those who understand how to compile XUB-

    this line appears in the makefile for XUB-



    ; Included .inc files
    %include "AssemblyLibrary.inc" ; Assembly Library. Must be included first!
  21. Thanks Chuck(G) - what is a profiler? I had a...

    Thanks Chuck(G) - what is a profiler?
    I had a thought today that I would probe the CF card signals while the delay is occurring, just to see if the return occurs AFTER the HDD is accessed.
  22. That's pretty old XUB. 602 is current. I dont...

    That's pretty old XUB. 602 is current.
    I dont think formatting affects if XUB can detect the CF card. Certainly a bad format is easy to get and hard to fix and prevents boot up, but not detection...
  23. 150 kB/s. Seems good. Seek times ate also fast....

    150 kB/s. Seems good.
    Seek times ate also fast. 2msec iirc.
  24. Path is very short disk is 32MB FAT12 I don't...

    Path is very short
    disk is 32MB FAT12
    I don't see the hard disk indicator light flickering at all during the stall, but the access could be so fast the LED can't respond with light.
    I get that...
  25. good test, I agree. I went and tried it just...

    good test, I agree. I went and tried it just after I put in the note.

    XT-CF? | CF card? | DOS | boot | response on A | response on C
    1 no | no | 3.1...
Results 1 to 25 of 100
Page 1 of 4 1 2 3 4