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Type: Posts; User: lafos

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  1. Here is a complete list of jumper settings

    Here is a complete list of jumper settings
  2. I have one of these drives. I could not get it to...

    I have one of these drives. I could not get it to work in my P233MMX system with an Adaptec AHA-1522A. It would fail on HD writes but would work as a 360KB drive. I put it in my Pentium III system...
  3. DA = Front LED controlled by drive select UA =...

    DA = Front LED controlled by drive select
    UA = Front LED controlled by ready signal
    HA = Front LED controlled by ready and drive select signals
    LA = Front LED controlled by ready signal selecting...
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    The 4P used a coded cable with pins removed for...

    The 4P used a coded cable with pins removed for drive select. The drives themselves are selected as all drives. The TRS-80 line was consistent in this. It might have changed in the 4D due to...
  5. You forget we're now in the land of facebook and...

    You forget we're now in the land of facebook and other "services" that will go to great lengths to get your personal information. Microsoft is mild in comparison. I have an outlook.com account that...
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    You might be thinking of the Tandy 10 or Tandy...

    You might be thinking of the Tandy 10 or Tandy 150. See post #7

    http://www.vcfed.org/forum/showthread.php?70309-What-rare-unusual-or-non-US-computers-did-Tandy-sell&highlight=Tandy+150

    Tandy...
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    Do you have the service manual? It has...

    Do you have the service manual? It has troubleshooting information. If you don't have it, search on archive.org
  8. Thread: External Numpad?

    by lafos
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    Which TRS-80? There was an internal numpad sold...

    Which TRS-80? There was an internal numpad sold for the Model I for programmers needing hexadecimal. Offhand, I don't know of an external pad, as the other models had the numeric pad integral to...
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    Hooray! Glad to help

    Hooray! Glad to help
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    There is a lot of useful information including...

    There is a lot of useful information including troubleshooting a 5150 at

    http://www.minuszerodegrees.net/index.htm
  11. If you are using MSDOS or Windows no higher than...

    If you are using MSDOS or Windows no higher than Win98SE on your computer, the attachment will help. It was extracted from the technical document in the emulator doc package.

    Assign a bootable...
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    57500 Here are the contents of all five disks

    57500

    Here are the contents of all five disks
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    I have MSDOS 5.0 on 360K disks. Mine say "SPRING"...

    I have MSDOS 5.0 on 360K disks. Mine say "SPRING" in the lower right where yours has "Microsoft". There are a few other differences in labels. Mine is a 5-disk set. I installed the set on my 5150...
  14. Holmes Engineering sold an internal memory option...

    Holmes Engineering sold an internal memory option for the TRS-80 Model I. This is text from archive.org, with a couple corrections from the pdf file

    "MODIFYING THE 'NEW STYLE" EXPANSION...
  15. Do you know the history of the B EI? I know some...

    Do you know the history of the B EI? I know some people have modified their keyboards to contain more memory. If they do that, I'd guess that memory addressing in the EI would have to be changed so...
  16. What does the Model I memory test tell you? If...

    What does the Model I memory test tell you? If you press reset while holding down [Break] do you get the memory size? question? If so, and you then hit [Enter] followed by ?MEM [Enter] do you get...
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    Can you find labels with model numbers? The...

    Can you find labels with model numbers? The first photo looks like my Tandon TM-100-2. Hopefully, cleaning the drives will help.
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    I've heard that same residue warning for years...

    I've heard that same residue warning for years and years. Supposedly, there were some rubbing alcohols that had an oily impurity. I remember testing 91% isopropanol by evaporating some on a weighing...
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    The drive model information would be helpful. It...

    The drive model information would be helpful. It can be on the rear or one of the sides. They look very similar; they may be different revisions from the same manufacturer.

    The most common...
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    Looks like its been modified. That red pilot...

    Looks like its been modified. That red pilot light in lower right is where the connection cable normally exits the case.
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    Have you run a memory diagnostic? DOS 5 and 6.22...

    Have you run a memory diagnostic? DOS 5 and 6.22 use more RAM than 3.30, but otherwise should be compatible.
  22. Plus shipping?

    Plus shipping?
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    I have both IBM 5150 and 5160 with AST SixPak+...

    I have both IBM 5150 and 5160 with AST SixPak+ cards and they run DOS 5 and 6.22. The 5150 has an XTIDE-CF while the 5160 has a 10MB FH HD. It also has the 8087 chip and is not close to limiting the...
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    Don't forget PSU efficiencies weren't very high...

    Don't forget PSU efficiencies weren't very high back then. A PSU that gives 130W out probably uses close to 200W. A FH hard drive can pull 12V 4A during spin-up, depending on the drive. OTOH, a...
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    IBM PC/XT 5160 with AST SixPak+, MFM controller,...

    IBM PC/XT 5160 with AST SixPak+, MFM controller, IBM FH 10 MB HD, Tandon FH Floppy drive, IBM floppy controller, and IBM CGA card:

    Initial power-up = 104 W
    RAM test = 85 W
    HD boot to MS-DOS = 92...
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