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  1. Replies
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    Per the 'Today' section of [here...

    Per the 'Today' section of [here], because you have the 10/27/82 revision BIOS, there are a few CF options available to you.
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    Lots of IBM 5150 information at...

    Lots of IBM 5150 information at minuszerodegrees.net


    If I go to the rear of one of my 5150's, I see two 25-pin parallel ports. One is provided by the IBM MDA card. The other is provided via an...
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    I am unfamiliar with that programmer, but the...

    I am unfamiliar with that programmer, but the operation should be as simple as read in the HEX file, then program the chip.
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    The 5150 and 5160 motherboards decode different...

    The 5150 and 5160 motherboards decode different I/O address ranges.
    See the 'Increased I/O port range for expansion cards to use' section at [here].
  5. You wrote, "Model F's absolutely need to be...

    You wrote, "Model F's absolutely need to be grounded since they are capacitive." That is not the reason they are grounded. As I wrote, they are grounded for other reasons.
  6. Various parts of the circuitry will be connected...

    Various parts of the circuitry will be connected to ground by the design engineer, for various reasons (e.g. signal return, power return, ...), but the design engineer will not have said to themself,...
  7. But even with the early (i.e. type 1) keyboard,...

    But even with the early (i.e. type 1) keyboard, the 5150/5155/5160 motherboard cannot force a hardware reset of the keyboard later.

    (Reset of type 1 keyboard is connected to motherboard's reset...
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    Welcome to these forums. The braided bare...

    Welcome to these forums.


    The braided bare wires (and spring) are strapped across the outside of the 'bell' end of the CRT, to ground the aquadag coating there.
    A photo showing an example...
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    Taken in isolation, no, but we have seen some...

    Taken in isolation, no, but we have seen some pretty weird stuff over the years. Factor in other symptoms such as "It won't hold the time for even a restart." and a 'Real time clock error' message...
  10. For the quoted configuration, the following...

    For the quoted configuration, the following keyboards work (reliably) in Below The Root for me:

    * IBM 83-key keyboard ([photo])
    * Key Tronic model 101WN ([photo]), switched to XT mode
    * IBM...
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    A lot of people think, "If the CMOS battery is...

    A lot of people think, "If the CMOS battery is dead, all that means is the CMOS SETUP (and clock) information will be lost when I turn off the computer. So if I keep the computer powered on, I should...
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    At the top of the photo, I can make out, 'Real...

    At the top of the photo, I can make out, 'Real time clock error'. Any other errors not in the photo?

    The Internet indicates that the P4D-66's motherboard has a Dallas RTC module, one that contains...
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    The video error is certainly unexpected, but has...

    The video error is certainly unexpected, but has been observed before in an IBM 5150 as a side effect of a 201 error: At [here] is a very early thread, and at post 15, member Tezza hears an...
  14. I no longer have a 5155, but I do have an early...

    I no longer have a 5155, but I do have an early 5160. I stripped down the 5160 to match a 'bare bones' 5155. So, my 5160 became:

    * 64-256KB version of 5160 motherboard, fitted with 256K of RAM,...
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    Member schnurzel came up with some alternative...

    Member schnurzel came up with some alternative firmware for the converter's PIC chip. It maybe the answer. Available at [here].

    You will need a device that can program the firmware into the 12F629...
  16. Refer to the BIOS Video Modes info at [here...

    Refer to the BIOS Video Modes info at [here], in particular to the 'EGA monitor on EGA card' column.

    IBM EGA cards are capable of modes 00h/01h/02h/03h/04h/05h/06h/ODh/0Eh/10h. Of those, notice...
  17. Thread: Epson PC AX2E

    by modem7
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    Welcome to these forums Mike. SETUP.EXE for...

    Welcome to these forums Mike.


    SETUP.EXE for the Epson AX2 is at [here]. Maybe it is suitable for the AX2E as well.
  18. There is always a possibility that the SETUP...

    There is always a possibility that the SETUP and/or clock information in a CMOS/RTC chip is, or becomes, corrupted, even if the CMOS/RTC chip contains a battery.
    Ideally, any programmer tasked with...
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    Expected. The block/s that corresponds to...

    Expected. The block/s that corresponds to [cylinder 94, head 0].


    Does the following also explain the symptom: Read/write circuitry in drive is faulty, corrupting data. The degree/frequency of...
  20. The PGS HX-12 is a CGA monitor (i.e. H.SYNC:...

    The PGS HX-12 is a CGA monitor (i.e. H.SYNC: positive at 15.7 kHz, V.SYNC: positive at 60 Hz).

    Therefore,
    * The HX-12 will be able to display video modes that run at CGA sync...
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    Yes, the RAM test component of a power-on self...

    Yes, the RAM test component of a power-on self test is usually quick-and-dirty.


    Agreed.
    The "(s)" sigifies that the address displayed is a segment address. 4000:0 corresponds to 256K, pointing...
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    When you use DOS' date and time commands, the...

    When you use DOS' date and time commands, the date and time shown is the DOS clock, not the RTC clock. So I think the first thing to do is to confirm that the RTC clock is advancing when the...
  23. What I would do: If I could see just a little...

    What I would do:

    If I could see just a little bit of the pin sticking out, I might try to use some needle nose pliers to fully pull the pin back out again (hoping that whatever pin retention...
  24. Pin 6 is for the red ground/shield. It looks as...

    Pin 6 is for the red ground/shield. It looks as though the pin simply got pushed in when the plug was screwed on. Back in the day, the commonest pin related problem that I saw on faulty VGA monitors...
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    I have replied in the thread that you started...

    I have replied in the thread that you started about that.
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