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Type: Posts; User: clh333

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    The definition of insanity...

    ... is doing the same thing over and over and expecting different results. Undeterred, I have acquired another AT&T machine, having bricked two others.

    Physically this resembles my 6312 WGS but...
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    Never seen an Altair, or an IMSAI, either, for...

    Never seen an Altair, or an IMSAI, either, for that matter. I considered finding a "legacy" machine but I thought better. Not so much for the cost, as this project will probably equal that, but for...
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    I dug through the drawers and found a 12VDC 3A...

    I dug through the drawers and found a 12VDC 3A switcher that will do for now, mainly just to run the fans.

    The case I chose - CoolerMaster HAF XB - is roomy enough for me to run the PSUs...
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    Thanks, Rich; makes sense to me. There is plenty...

    Thanks, Rich; makes sense to me. There is plenty of room in this chassis so one more switcher is pretty easily accomplished. And thanks, too, for maintaining classiccmp.org which has been very...
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    Once again, thank you all for your input. I took...

    Once again, thank you all for your input. I took on this project for its educational value; I have learned a lot already*. The backplane is constructed, the power supply passes initial tests, the...
  6. Thread: RTC for 4D

    by clh333
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    I am in the process of mapping the DS1216 to its...

    I am in the process of mapping the DS1216 to its carrier; not all DS pins are carried out. The carrier is 28 pin and U4 is 24 pin so the carrier "hung over" U4 and the ROM, which sat on top, was...
  7. Thread: RTC for 4D

    by clh333
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    Anti-static, but not conductive, according to the...

    Anti-static, but not conductive, according to the supplier. Also the supplier, McMaster-Carr, notes that the anti-static properties diminish over time.

    Bottom line is that next time I'm in...
  8. Thread: RTC for 4D

    by clh333
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    Thanks for the tip. The foam was sold as...

    Thanks for the tip. The foam was sold as anti-static; I'll have to verify that. But I never would have thought of tinfoil.

    -CH-
  9. Thread: RTC for 4D

    by clh333
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    Indeed. This is getting more interesting; thanks...

    Indeed. This is getting more interesting; thanks again for pointing this out.

    -CH-
  10. Thread: RTC for 4D

    by clh333
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    Tarkie101, I believe you're right, thanks. ...

    Tarkie101,

    I believe you're right, thanks. Not sure the chip can be replaced and battery is most likely dead, but interesting idea. Maybe dissect for reproduction...

    -CH-
  11. Thread: RTC for 4D

    by clh333
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    RTC for 4D

    Going through a Model 4D motherboard that appears to have suffered some damage through exposure to the elements I found a few "features" that at first I didn't recognize:

    First, there are a number...
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    The daughter board in question is the controller...

    The daughter board in question is the controller for the 20 MB Alps HD. There wasn't much information available about the Alps drive or its interface but I found this...
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    I'm not well-versed in SMT but after some YouTube...

    I'm not well-versed in SMT but after some YouTube instruction I managed to remove the small capacitors. The board underneath was a mess but I cleaned it as well as I could. We'll see how well the...
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    Modem slot is on the other side of the bay - RHS...

    Modem slot is on the other side of the bay - RHS viewed from rear. A cable comes up from the motherboard and is fixed in place with a slot facing the rear of the chassis. I haven't seen the modem...
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    Addressing leaky capacitors I come across the...

    Addressing leaky capacitors I come across the following on the mezzanine board: Topside at C1 and C4 are small 22uF 35V capacitors that have obviously leaked. They appear to be surface mount but...
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    Thank you for the information. I have some...

    Thank you for the information. I have some familiarity with the concept as I have XT-IDEs built from glitch's kits which are deployed in a couple of IBM 5160s (although the ROM Rev. is 1.x).
    ...
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    Mezzanine board under the HD was the restriction....

    Mezzanine board under the HD was the restriction. Motherboard out shows signs of leaky caps as does PSU; base tray may be repairable.

    HD is an ALPS DRP020A10A, which has a 26-pin connector that...
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    Following on Sparky: 1400 HD

    Recently acquired a Tandy 1400 HD and after making first assessments am tearing down to get a better look at internals. Battery pack is dead; display lights up but nothing is displayed on power-on;...
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    Drive is a Tokyo Electric Company ("TEC") Model...

    Drive is a Tokyo Electric Company ("TEC") Model FB 201; an interesting design with which I was unfamiliar.

    I fixed the power plug and verified output from the PSU 5 & 12 VDC. I managed to get...
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    On further investigation: The main control board...

    On further investigation: The main control board had two 47uf 16V electrolytic caps one of which clearly had failed; I replaced both. There are three inputs to the board, power, head signal and a...
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    ?! PM me... Thanks! -CH-

    ?! PM me... Thanks!

    -CH-
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    Color Mini Disk Service Manual Info Needed

    Acquired the model 26-3022 from an eBay seller and quickly found why it was "parts only": A mouse had established residence at one point and in addition to importing paper and foam bits and using...
  23. Poll: I was following the sage advice: "It is better to...

    I was following the sage advice: "It is better to keep your mouth shut and be thought a fool than to open it and remove all doubt." But since I have been called out by name I will offer what meager...
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    Thank you Mr. G.: Two more places I never knew...

    Thank you Mr. G.: Two more places I never knew existed.

    I'll have to look more closely at the bulb to verify its specs (I will need a magnifier for that task). The lamp holder is rated 24V but...
  25. Poll: Z380, CPLD, bus extension / expansion. (my 2c)

    Z380, CPLD, bus extension / expansion. (my 2c)
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