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Type: Posts; User: Dwight Elvey

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  1. It depends on what it is for. Many lap top...

    It depends on what it is for. Many lap top manufactures use the same screen bought from the same manufacture. You didn't think Dell makes LCD screens do you. I have an old Dell that I got from a...
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    Too many Daves in the world. Don't get me started...

    Too many Daves in the world. Don't get me started on Bobs.
    Dwight
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    Plugged a 486 in the wrong way. Dwight

    Plugged a 486 in the wrong way.
    Dwight
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    It should still work. All that board does is...

    It should still work. All that board does is substitute, selctively, the RAM or ROM as seen by the processor.
    Dwight
  5. Agree The magic is gone. Dwight

    Agree
    The magic is gone.
    Dwight
  6. I believe there are several ( at least two )...

    I believe there are several ( at least two ) stack processor FPGA designs on Github. At $250 for a RTX2000, that is a bargain. The space ready parts are much more than that. I have a setup with a...
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    I suspect the problem is inside of the RAM for...

    I suspect the problem is inside of the RAM for the addressing as well and data. We can see that the counter is getting through the mux for both high and low for SA4. Although, we've not tested for...
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    If I'd realized that the video RAM wasn't tested,...

    If I'd realized that the video RAM wasn't tested, I'd have looked at the screen a little closer and how it failed. We'd still have scoped the SA4 some but not spent as much time looking at good...
  9. It might be better to follow this thread for some...

    It might be better to follow this thread for some time and then make a new post. You'll get better response and the people helping won't confuse the two similar threads.
    There are a lot of things...
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    Ok, I went back to the first post. On the first...

    Ok, I went back to the first post. On the first post, it was stated that all the RAM was tested good. I'm not that sure that the video RAM was included on that test. Looking at the web page...
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    Yes but once located, a simple jumper wire can...

    Yes but once located, a simple jumper wire can correct it.
    I'm suspecting that the trace was damaged while unsoldering RAM and installing sockets. If the wire is good then we may have a more serious...
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    Hi Fran I mentioned Chopped/Alternate modes for...

    Hi Fran
    I mentioned Chopped/Alternate modes for the inputs. I realize that a digital scope is always in what we'd call chopped mode when both displays are seen. If not, it would not make any sense....
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    I thought I'd mention, the inputs are assumed to...

    I thought I'd mention, the inputs are assumed to have a decimal point as well in the center ( except the /10 of the denominator ). For the most art, this makes little difference since the result is a...
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    I thought I'd tell you what I was looking for in...

    I thought I'd tell you what I was looking for in the signals. There are two times relative to the clock signal that are interesting one is when the clock is high and the other when the clock is low....
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    I hope you ran a wire from the external trigger...

    I hope you ran a wire from the external trigger to either Pin13 or to pin14. Also since a wire is 1X you should set the trigger level to 2V.
    I see you showed a clock on the other channel but I...
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    Those all look OK. I'm thinking that something is...

    Those all look OK. I'm thinking that something is failing getting from the mux to the RAMs or I got the wrong address line.
    can you check SA4 all the way to each RAM? and make sure it looks the same...
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    I did some more experimenting. First, the...

    I did some more experimenting. First, the quotient has it decimal point at half way. The divisor looks to be first divided by 10. The R register has the dividend pushed to the bottom end of the...
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    You also need to look at the sign flag bits with...

    You also need to look at the sign flag bits with the RD0 and WR0. You should enter from the DVRT rather than directly into DECDEV. DVRT makes both values positive so the divide routine doesn't get...
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    My maneuver board is making slow progress. I have...

    My maneuver board is making slow progress. I have a few more parts to install but my wife has voluntold me into several projects.
    I hope to find time soon and see if the board works. I may have to...
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    I believe both the multiple and divide routines...

    I believe both the multiple and divide routines were written by Gary Kildall. You might mention that in you github. It might catch more people looking up Gary's history.
    What is the issue with...
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    He said he has a working N* Horizon so I'd assume...

    He said he has a working N* Horizon so I'd assume you said you could create Advantage software on that platform. I'd think with media, he is in business.
    I'd just realized that I have a couple...
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    You have a schematic, ohm things out. A broken...

    You have a schematic, ohm things out. A broken trace can be replaced with a wire.
    Dwight
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    You need to speed up the trace. We need to see...

    You need to speed up the trace. We need to see the quality of the bottom trace. We can't see much.
    As for trigger input, as I told you, you don't need a probe. You can get by with a wire. Be careful...
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    There is a chip enable and and output enable....

    There is a chip enable and and output enable. Both need to be zero at the same time.
    Dwight
  25. With bad zero page RAM, it is not likely to do...

    With bad zero page RAM, it is not likely to do much on the video out. Almost everything needs good page0 and some page1.
    Dwight
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