Image Map Image Map

Search:

Type: Posts; User: daver2

Page 1 of 20 1 2 3 4

Search: Search took 0.05 seconds.

  1. Replies
    4
    Views
    51

    I can look up the hardware tomorrow. However, you...

    I can look up the hardware tomorrow. However, you could always write a new device driver for OS/8 to support compatible physical hardware if it is not supported currently by OS/8.

    Dave
  2. Replies
    19
    Views
    252

    >>> Could you direct me towards the binary for...

    >>> Could you direct me towards the binary for the PETTEST ROM that you mention. I would like to burn an EPROM and pop this in the computer and see what happens.

    Sure can...
    ...
  3. Replies
    42
    Views
    378

    Good going on the shift clock... That would be...

    Good going on the shift clock...

    That would be UC5 (upper nibble).

    However, before unsoldering the VRAM; I would check to see what you are getting both sides of the latch UB3.

    Also, if the...
  4. Replies
    20
    Views
    183

    He He... Just concentrate on the CPU address...

    He He...

    Just concentrate on the CPU address lines, the address lines after the address buffers and the address lines on the ROM and DRAM data multiplexers for now.

    A0 on the CPU should be...
  5. Replies
    42
    Views
    378

    This is an interesting fault. Post #14 item...

    This is an interesting fault.

    Post #14 item (2) clearly indicates to me that it is the video signal from the PET to the monitor that is the problem. Disconnecting the PET video signal causes the...
  6. Replies
    20
    Views
    183

    Same observation as Larry regarding the Voltage...

    Same observation as Larry regarding the Voltage levels.

    We are supposed to be looking at the CPU address lines, the buffered address lines and the address lines on the ROM and DRAM multiplexers -...
  7. Replies
    42
    Views
    378

    I did read that in your previous post regarding...

    I did read that in your previous post regarding E30 though.

    The problem with using a capacitance meter is that the capacitor could break down when subjected to a voltage across it (especially in...
  8. Replies
    42
    Views
    378

    The video and the H/V shouldn't interact with...

    The video and the H/V shouldn't interact with each other - unless the E30 Voltage is being compromised in some way?

    Dave
  9. Replies
    20
    Views
    183

    I would. The information you require is back...

    I would.

    The information you require is back in post #6.

    Dave
  10. Replies
    20
    Views
    183

    He He... Unfortunately, I am working from home...

    He He...

    Unfortunately, I am working from home every day! It is just that I was reviewing some documents over the weekend for someone fir this morning - so I am entitled to take today off!

    What...
  11. Replies
    20
    Views
    183

    Yes, every address is half the frequency of the...

    Yes, every address is half the frequency of the previous one as you have stated.

    We are holding our breath!

    Dave
  12. Replies
    20
    Views
    183

    Yes, use a ‘scope. After you install the NOP...

    Yes, use a ‘scope.

    After you install the NOP generator, address line A0 should have a square wave of 250 kHz (I think). A1 should be half of that, A2 should be half of that again and so on to A15....
  13. Is this for a specific job, or are you looking...

    Is this for a specific job, or are you looking for 1K*1 generic? Unicorn electronics have 16 pin 1024*1 70ns. Not cheap though.

    They don’t have any 18 pin devices though.

    Dave
  14. Replies
    20
    Views
    183

    Well done for fixing the monitor... By the...

    Well done for fixing the monitor...

    By the way, which electrolytic was it in the end? Just worth knowing for future reference...

    As to your next problem...

    Clearly there is a problem with...
  15. Replies
    19
    Views
    252

    >>> First of all, I have to say that this forum...

    >>> First of all, I have to say that this forum is awesome. I only posted the thread a few minutes ago.

    We try!

    A frequency counter will be very useful if you need to build a NOP generator...
    ...
  16. Replies
    19
    Views
    252

    Welcome to VCFED Pip. Another 8032...

    Welcome to VCFED Pip.

    Another 8032 resurrection - Yeh!

    My first question would be: without an oscilloscope - what test equipment are you using to look for HSYNC and VSYNC and what test...
  17. Can I bump this thread and see if anyone has...

    Can I bump this thread and see if anyone has found either documentation or media for MicroPower/PASCAL in the intervening time please?

    Cheers,

    Dave
  18. Replies
    5
    Views
    190

    I was debugging the darn things just before the...

    I was debugging the darn things just before the lockdown!

    In fact, I should be up at your end of the world now...

    Yes, USB serial things are not really 'true' RS232. Although the signal levels...
  19. Replies
    2
    Views
    74

    This looks like a 'non-standard' CPM modification...

    This looks like a 'non-standard' CPM modification to me.

    IC45 will be required as it interfaces the NAS-SYS and BASIC ROMS to the CPU along with any of the local on-board RAM/EPROM devices. Some...
  20. Replies
    13
    Views
    346

    Forgot about the ‘D’ input being grounded, so...

    Forgot about the ‘D’ input being grounded, so yes, only 0..7 and the digit not being enabled at all to give us the blank.

    Always better to ‘debunk’ with evidence rather than just stating ”April...
  21. Replies
    13
    Views
    346

    The description of the 'older' card is here...

    The description of the 'older' card is here http://www.bitsavers.org/pdf/dec/pdp11/1134/KY11-LB_MaintMan.pdf along with the 8008 firmware listing.

    The schematics of the older and newer cards are...
  22. Replies
    13
    Views
    346

    On both variants of M7859 card the seven segment...

    On both variants of M7859 card the seven segment LED displays are driven by an SN7447A BCD to 7-segment driver IC.

    Looking up the Texas Instruments datasheet for this device indicates that the...
  23. Found this: ...

    Found this:

    http://bitsavers.trailing-edge.com/pdf/dec/pdp11/handbooks/PDP11_Software_Handbook_1978.pdf

    Page 6 onwards identifies which hardware can run which O/S.

    Not much - but it's a...
  24. I do remember seeing in the documentation for the...

    I do remember seeing in the documentation for the various PDP machines that we bought a list of 'officially supported' DEC Operating Systems and software. I haven't got a concrete document I can...
  25. Replies
    177
    Views
    8,812

    You can never go wrong with space invaders! ...

    You can never go wrong with space invaders!

    Nice job!

    Dave
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4