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Recent content by jdreesen

  1. J

    The Datapoint 5500 thread..

    With the finished schematics of backplane and decoder it is on with the hardware itself : fixed mains switch and tempguard, reconditioned main caps, checked main transistors, and presto : +5V is present ! Sometimes its easy.... But always keep in mind that the design is really very dangerous...
  2. J

    Tektronix 4052/4054 Multifunction modules available.

    Apologies, that error was coming from my side. I mixed up the script that generates the ROM binaries. Sorry for the timewaste ...
  3. J

    Tektronix 4052/4054 Multifunction modules available.

    Yep, that seems to be the problem. The printer driver software is shifted by 4K. Other potential pitfall : the 6850 needs to be the 2MHz variant, i.e. 68B50. If alls fails : a very quick hack to obtain a programmable bit : add a 74ls74, with set and reset coupled to the 68B50. Reading/writing...
  4. J

    Tektronix 4052/4054 Multifunction modules available.

    I will look into creating a guideline for using the RS232 interface. However if you are only interested in toggeling a pin there is a wholly different approach possible : take a look at my 4052 RAMpack design, there I control the TTL counters directly from my 4052 machine. You have a RAM pcb...
  5. J

    The Datapoint 5500 thread..

    And the final installment of my re-engineering efforts : schematics of the backplane, the decoder_iii and an updated schematic of the mainboard. Changes are mainly to do with naming consistency across the different schematics. Also, for completeness sake, some pictures of the backpanel. Note...
  6. J

    Midwest Datapoint 1500 Value

    Hi Christian. would you happen to still have software / documentation for that system ? I am located in Koblenz/Aargau and have the exact same setup here... Jos Dreesen
  7. J

    The Datapoint 5500 thread..

    Not sure what you mean by boot-routine. The initial loading from a mass storage device ? The manual describes this as the "restart" operation ( appendix A) There we will need to check the firmware to locate that call. The machine I took the ROM from does not have tapes, therefore there must be...
  8. J

    Western Europe Various docs (CPT 9000, 212/AT, 212/BB, Diablo 1200, NCR, Zenith) : 5 euro's each

    I do have a spare monitor, but sending it to the US is not a practical proposition,,,,
  9. J

    Western Europe Various docs (CPT 9000, 212/AT, 212/BB, Diablo 1200, NCR, Zenith) : 5 euro's each

    Sorry, have missed this. These manuals are now with me, as I have a running CPT9000 system. I suppose I could scan this material. As already mentioned elsewhere on VCFED, i have some of the 9000 systemsoftware on my FTP site ftp://ftp.dreesen.ch/CPT Looking for a CPT9000 keyboard. It does run...
  10. J

    The Datapoint 5500 thread..

    ...and the rest... ( yes the bootboard only has a switch on it...)
  11. J

    The Datapoint 5500 thread..

    Decoder, Keyboard driver, display board....
  12. J

    The Datapoint 5500 thread..

    ....memory boards...
  13. J

    The Datapoint 5500 thread..

    Some pics of the mainboard....
  14. J

    The Datapoint 5500 thread..

    Got sidetracked by other projects.... Aren't these jumnps described in the 5500 hardware manual, page 10 ?
  15. J

    Bruce Culbertson NS32016 design

    Just a reminder : the design for the Ceres-1, a NS32032 machine with 1000x800 display, running the Oberon system, is out there, including all schematics, software, PAL equations for EP610's used. Designed by ateam under the lead of Niklaus Wirth, who just passed away last month. The followup...
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