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Type: Posts; User: candrews

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  1. Four T-States: T1---PC OUT & status bits...

    Four T-States:
    T1---PC OUT & status bits
    T2---PC=PC+1
    T3---Instruction read into temp internal register
    T4---HL exchanged with DE

    (one machine cycle)
  2. Solved. Bug in initialization utility.

    Solved. Bug in initialization utility.
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    the BOM for this bubble board looks like it is in...

    the BOM for this bubble board looks like it is in the neighborhood of $65 plus the 7 intel bubble chips. As you mentioned, should just take a little signal patching to connect to the expansion port.
  4. Schematics and BOM for the SBC-85 Bubble Board are nowuploaded if you are interested

    The schematic, some driver utilities, and BOM for the 1Mbit bubble board are up on the project website now:
    http://sbc-85.com/index.php/documentation/
  5. Need advice from a magnetic bubble memory expert here on FIFO underflow

    Using the bubble read command in poll mode, I can not figure out why my bubble memory board Hackaday.io is letting me read past the initial FIFO load. I can write to the bubble and the 7220 FIFO...
  6. Good eye for spotting these. Their bubble is the...

    Good eye for spotting these. Their bubble is the 7114, not the 7110, but the 7220, 7230, 7242, and 7250 look good. no 7254s listed. I do have several 7254s if push comes to shove and people have...
  7. Thanks. I plan on doing one more video on bubble...

    Thanks. I plan on doing one more video on bubble memory since the technology was so short lived it is unheard of by most of the young’ns.
  8. I forget the part number, but there is an intel...

    I forget the part number, but there is an intel bubble kit that has the 7110 and its five support chips. (The 7220 controller is not included in the kit since it could control eight bubble chip...
  9. I see new bubble kits on eBay now and then.

    I see new bubble kits on eBay now and then.
  10. As far as reliability, bubble had excellent...

    As far as reliability, bubble had excellent reliability if the design implementation was good. Some of the best were the Intel iSBC256 for multibus and their iSBX. They also had a bubble option in...
  11. Anyone else have an attraction to Magnetic Bubble Memory?

    Ever since hearing about magnetic bubble memory, I have wanted to make a card for my 8085 single board computer system. However first it was limited release, then it was too expensive, then it was...
  12. Probably the nicest 8085 bus monitor I have seen. Build files are now available.

    To all the 8085 enthusiasts or 8085 curious out there, the build gerber files for a bus monitor on the SBC-85 system have been uploaded.

    In addition to all the blinky LEDs for binary, this monitor...
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    Maybe it is genetic. Computer people don’t like...

    Maybe it is genetic. Computer people don’t like the smell or feel of oiled tape. Teletype and CNC people thrive on machine oil fumes.

    When I need (non oiled) paper tape I have a paper company...
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    Latest 8085 Single Board Computer

    Hi all

    Having cut my teeth on the MCS-80/85 I felt the need to recreate a somewhat updated version of the first 8085 system I wirewrapped decades ago. If anyone is interested, the boards are an...
  15. Looking for an Intel 8085 3-chip solution (8085, 8755, 8156) PCB

    I have a hankering to play with the original intel 3 chip set (8085, 8755, 8156) as published (for example) in the MCS-85 manual. I had wire wrapped one decades ago but of course it is long gone. ...
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    Your profile doesn’t indicate where you are...

    Your profile doesn’t indicate where you are located, chances are there is someone nearby that can read the tapes. I can read them if you are in the PNW, It would only take a few minutes to feed them...
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    Just read it as raw data, then interpret once it...

    Just read it as raw data, then interpret once it is in electronic form where it is easier to identify patterns.
    Just keep in mind that a lot of these tapes are simply data in binary form so...
  18. Thanks Dwight. But if something doesn’t crop up...

    Thanks Dwight. But if something doesn’t crop up I’ll do it in C

    Craig
  19. Lots of options indeed, I did not see octal but...

    Lots of options indeed, I did not see octal but maybe some good ideas. Thanks
  20. Utility to convert intel hex into ascii stream for sending from terminal emulator

    I often have the need to simulate a paper tape reader and send ascii from a terminal to some hardware using “send file” as if typing (in hex or octal). For example, send code to a little boot...
  21. Dead dead. As in missing components dead.

    Dead dead. As in missing components dead.
  22. Thanks. I have the 80/20-4 and the 80/24A...

    Thanks. I have the 80/20-4 and the 80/24A documentation. It is the 80/24 schematics that doesn’t seem to be anywhere

    Craig
  23. Need intel iSBC 80/24 schematics and/or user manual

    My next project may be a dead iSBC 80/24 that has been calling to me. I have schematics for the earlier 80/20-4 and the later 80/24A but not the 80/24 itself. Does anyone happen to know if these...
  24. Need Intel iSBC 80/24 Schematics and/or users manual

    My next project may be a dead iSBC 80/24 that has been calling to me. I have schematics for the earlier 80/20-4 and the later 80/24A but not the 80/24 itself. Does anyone happen to know if these...
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    Dwight were the SIM4-01 and SIM4-02...

    Dwight

    were the SIM4-01 and SIM4-02 contemporaries that were differentiated by price and capability or are they revisions that came out sequentially and the intent of the -02 was to replace the...
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