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  1. inmbolmie

    IBM 4701-2 branch controller, software needed

    Hi, this is my little IBM 4700 Finance Communication System project. I have so far a restored 4704 terminal with the matching monitor and a 4701-2 branch controller that provides the local loop where the terminal should be connected. So far I have both pieces working and I managed to get...
  2. inmbolmie

    IBM 4704 missing video signals

    Hi, have everything assembled back and thanks to @snuci pinout with a proper DA-15 monitor cable. I ended up including an external circuit that drives the VSYNC signal to the monitor directly from the CRTC chip. Even added a custom TMK converter to hook an AT/ PS2 keyboard to it: Still not...
  3. inmbolmie

    IBM 4704 missing video signals

    Progressing... Still missing vsync at the output but in the worst case I know where to get it. Definitely the terminal detects the monitor somehow, apart from the grounded yellow cable, maybe it measures the current flowing on some pins or something. Updated pinout: ground (shield) red...
  4. inmbolmie

    IBM 4704 missing video signals

    Wow! Thanks a lot, it will be very useful. We have the same number of cables available so no crossed cables, and the colors are also the same. In your schema this would be the DA-15 pin assignments by pin number: ground (shield) red (+6,5V) empty empty light blue (? input, unconnected on the...
  5. inmbolmie

    IBM 4704 missing video signals

    Hi Snuci, my cable is completely gone. Your very beautiful terminal is the unit from here: http://kishy.ca. Of course I have already studied you images, as it is the only good source of information available, but unfortunately you have a later version that is PCB-based while this is an earlier...
  6. inmbolmie

    IBM 4704 missing video signals

    I have embarked on a silly quest to make this work: IBM 4704 banking terminal, I don't still have the (expensive) keyboard but that's not a concern as the protocol is pretty well documented and a converter could be made. My worries are, in this order: 1 - Figure out the monitor pinout and...
  7. inmbolmie

    IBM 5160 overclock Sergey’s way

    I'll give the full details here. If you try, be aware that it can void your warranty...:lol: So first, this is the original schematic: http://www.vcfed.org/forum/attachment.php?attachmentid=17804&d=1395123082 And this is my modified schematic. Things that I’ve changed from Sergey’s...
  8. inmbolmie

    IBM 5160 overclock Sergey’s way

    This is a continuation of this thread: http://www.vcfed.org/forum/showthread.php?41940-IBM-XT-cpu-upgrade. I've not seen any further development of this idea and it is a very old thread, so I start a new one in response. In that thread Sergey Malinov posted a proposal of overclocking circuit...
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