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  1. Replies
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    Replying to my own post with the solution from...

    Replying to my own post with the solution from Glitch. Replacing the original 74HCT04 with a 74LS04 fixes the clock problem. The newer boards already ship with the LS part so they do not have an...
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    Just finished building mine. This is a really...

    Just finished building mine. This is a really nice kit. The board well designed and is clearly marked so you can almost build it without the directions.

    I did run into one odd problem with the...
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    I'm interested, but they don't seem to be on your...

    I'm interested, but they don't seem to be on your store page. How do I get an order in?
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    The other option is to get a USB to serial...

    The other option is to get a USB to serial adapter that does real RS-232 instead of 5V FTDI. Just look for the ones that have a USB on one end and a DB-9 on the other. You can pick them up online...
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    I wasn’t able to get up to the show. Are there...

    I wasn’t able to get up to the show. Are there any kits or boards remaining?
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    Any update on this project? I was busy this...

    Any update on this project? I was busy this weekend, but may be able to come up tomorrow to catch the last day of VCF.
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    I finally got the EPROM programmer design updated...

    I finally got the EPROM programmer design updated to support 8755A chips. There is a new thread on it in the Tech Support goup here:...
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    Simple Arduino-based EPROM programmer

    As an alternative to Willem programmers and the budget USB designs, I've put together a EPROM programmer that can be built on a breadboard using an Arduino and a few additional parts that you...
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    Dwight - I didn’t realize there was a difference....

    Dwight - I didn’t realize there was a difference. I lucked out and my parts and data sheet were both 8755A, so I didn’t need to debug a mismatch problem. I’ll update the project to note that it is...
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    My updates to the Arduino EPROM programmer for...

    My updates to the Arduino EPROM programmer for the 8755 worked. I'll create a post with the schematic and new code. The hardware design is simple. It has just needs two transistors and a few more...
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    Simon, That looks to be just what I need. I...

    Simon,

    That looks to be just what I need. I drew up something similar, but my 5V side was much more complicated than it needs to be. Just shows what happens when software guys try to do analog...
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    I've had partial success modifying my arduino...

    I've had partial success modifying my arduino design for 8755s. The software and hardware modifications are done for reading and it is able to read and checksum the 8355 from the Explorer/85. ...
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    You may also want to look at the Arduino-based...

    You may also want to look at the Arduino-based programmer I built for my Netronics 8085 project. It is designed for 32K EEPROMs, but the design is modular and could be easily adapted to 8755s. It...
  14. Thread: Tei computer

    by nib
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    For a disassembler, try DASMx...

    For a disassembler, try DASMx. It does very good multi-pass disassembly and it lets you input your own symbol table to define labels or regions. I used it for a monitor ROM. The best part is that...
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    That looked like a nice one. Too bad you missed...

    That looked like a nice one. Too bad you missed it.

    If you want to read your ROM and don't mind doing a small breadboard project, I could probably modify my Arduino-based EEPROM programmer to...
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    Scanned in a copy of the AP-1 instructions and...

    Scanned in a copy of the AP-1 instructions and schematic:
    https://www.dropbox.com/s/8xgsgmnwv16w57a/Netronics%20AP-1%20Power.pdf?dl=0
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    Here are photos of the AP-1 Power Supply. I'll...

    Here are photos of the AP-1 Power Supply. I'll get the manual scanned and will post that as well.
    36745367463674736748
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    That terminal brings back memories. I had the...

    That terminal brings back memories. I had the same one for my system, but can't find it now. It may have gotten trashed at some point. My system had problems with the RS-232 blowing out the driver...
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    To expand on my earlier reply and archeocomp's...

    To expand on my earlier reply and archeocomp's above, I have an arduino-based EEPROM design that could be adapted to do this. The code is already fairly modular, so it would just require the...
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    falter - You can pick up another 8755 for about...

    falter - You can pick up another 8755 for about $10 - $15 on ebay and flash it with the serial monitor. I'm sure someone on the board here has a programmer that can burn those. If not, I may be...
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    Funny you should mention TEA. I have a copy of...

    Funny you should mention TEA. I have a copy of that book on order right now. That may be the next project. I also have my old copy of Threaded Interpretive Languages, so Forth is a possibility...
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    Explorer/85 inspired 8085 Project

    This isn't really an S-100 computer, but it was inspired by one, so this seems like a reasonable forum for it.

    I recently dug out my old Netronics Explorer/85 from 1981 and powered it up to see if...
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    gslick - Thanks! I've been curious to compare...

    gslick - Thanks! I've been curious to compare the SDK-85 to the Explorer. I'll track down the manual for the listing as well.

    Jim - I'll find my Basic dumps for you. I can't remember if I used...
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    Those are the Basic ROMs. Two new photos are...

    Those are the Basic ROMs. Two new photos are attached that show things a little clearer.

    Thanks for the link. I have those same manuals, same versions, although not scanned in. I should...
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    falter, I just took another look at your...

    falter,

    I just took another look at your photos and realize what you meant by ikbd. You are correct - that is the ROM monitor burned into an 8755. Mine is in the factory-programmed 8355 instead....
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