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Type: Posts; User: fatwizard

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  1. There is no motherboard battery in a Compaq...

    There is no motherboard battery in a Compaq portable 1.
  2. Replies
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    3,855

    0 to 4 heads is five heads. Shouldn't it be 0...

    0 to 4 heads is five heads. Shouldn't it be 0 to3? My money is on the Tandon drive being the problem, not the controller.
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    I have a box of scrap Western Digital/Tandon 3.5"...

    I have a box of scrap Western Digital/Tandon 3.5" hard drives. They have not survived the years very well at all. Stiction is a problem with many of them. I have a couple of them that will work...
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    I acquired a 1rst gen 5170 motherboard (512K...

    I acquired a 1rst gen 5170 motherboard (512K stacked chips/6 MHz) that worked fine, but I didn't have a 5170 case to put it in. Later I got my hands on a whole 5170, but it's motherboard was damaged...
  5. If you get the Portable I working, be prepared to...

    If you get the Portable I working, be prepared to replace all of the foam pads under the keyboard keys. I've yet to see one that didn't have rotted foam pads in the keyboard. I'll type OK at first,...
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    With so many bad components, it might lighting...

    With so many bad components, it might lighting damage.
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    I have some ST-01 cards and have only used them...

    I have some ST-01 cards and have only used them in 8bit PCs, with no problems. I have never even tried one in an AT system. I have had lots of strange failures of the 50 conductor cables/connectors...
  8. I believe the audio output on a Compaq of that...

    I believe the audio output on a Compaq of that era had the amplifier in the computer as opposed to being in the speakers. I have a Presario 4660 I'm playing with now that has the amplifier built in...
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    428

    Standard PC floppy drives are jumpered as DS1. ...

    Standard PC floppy drives are jumpered as DS1. In two drive setups, the twist in the cable is what swaps the drive assignments. Both drives set as DS1, the one before the twist is DS1, and the one...
  10. I'm not sure what that card is. I've never seen...

    I'm not sure what that card is. I've never seen one like it, nor can I find any info on it online.
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    I would like to recommend an extra step to the...

    I would like to recommend an extra step to the cleaning/lubricating regime for Tandon drives. I always let some light oil soak into the stepper motor around the spindle. Set the drive on it's side...
  12. The ST225 will spin up, then make a series of...

    The ST225 will spin up, then make a series of muttering sounds as it moves the heads toward track zero with a final sweep sound as it comes ready. If the drive is spinning up, but makes no sounds...
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    If your 800XL has it's main chips socketed, you...

    If your 800XL has it's main chips socketed, you should try re-seating all of them. If you are using the original Atari power supply it would be wise to check it as well.
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    My first computer of any kind was an Atari 800,...

    My first computer of any kind was an Atari 800, bought in 1982. I have since collected all of the US released 8bit models. A 400, 600 and 800XL, 1200XL, 65 and 130XE, and lastly the XEGS as well as...
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    1,440

    Can you tell if the power supply fan starts? If...

    Can you tell if the power supply fan starts? If it has the full 640K of RAM, it will take about 40 seconds to finish POST before it will beep.
  16. Any chance you were in the CMOS setup and somehow...

    Any chance you were in the CMOS setup and somehow removed the entry for drive B:? I believe if the system thinks there is only one floppy drive it will access the A: drive when you ask for A: or B:....
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    2,358

    I believe the composite output depends on the RF...

    I believe the composite output depends on the RF modulator. The STs that did not have an RF modulator did not have composite video available. This, at least is true of the 1040 STf model I have,...
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    You should have gotten some kind of display with...

    You should have gotten some kind of display with what you have. Your 520 sounds like it is the same or very similar to mine, and mine displays the green desktop with the mouse pointer and the menu...
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    I'll be dipped! Looks like I tediously modified...

    I'll be dipped! Looks like I tediously modified a couple of PC floppy drives for no reason. I obviously never looked for the DC or ready lines in the pinout diagrams. I have read repeatedly about...
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    The floppy drive will work without the DC line,...

    The floppy drive will work without the DC line, but you have to be careful to close any windows to the disk that are open before you eject the disk or corruption can occur, or so I have read. I have...
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    I have a 520 ST currently setup. The original...

    I have a 520 ST currently setup. The original form factor with TOS in ROM, an external power supply, and no internal floppy drive. I just tried booting it up with the floppy drive disconnected, and...
  22. Resistors that burn up like that almost certainly...

    Resistors that burn up like that almost certainly did so because of a short somewhere in the circuit. It's a good bet a replacement resistor will fail the same way.
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    The hard drive might be gone, but the "Invalid...

    The hard drive might be gone, but the "Invalid Configuration" message indicates that a dead CMOS battery is the likely culprit. The hard drive parameters are stored in CMOS , and if that data is...
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    I have modified a standard PC 3.5" floppy drive...

    I have modified a standard PC 3.5" floppy drive to work in my ST. The drive needs to be set as drive 0, or the first drive, instead of the typical drive 1 setting for PC drives. Also, the disk...
  25. I'm not familiar with that specific machine, but...

    I'm not familiar with that specific machine, but it sounds like a floating ground to me. I would maybe take a look at the ground connections to the power supply. In photos of the motherboard online...
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