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    Do you know what type of memory board your Apple...

    Do you know what type of memory board your Apple III has?
    Something reasonably easy to try is seeing if there's one or more bad RAM chips. Depending on which type of memory board you have, it may be...
  2. Apologies for the delay for those interested - at...

    Apologies for the delay for those interested - at long last I've got a batch of ROMulators ready to go and will start getting them out to you.
    It will come with 4 ROM settings pre-installed - BASIC...
  3. Latest on the ROMulator - I got a few of the...

    Latest on the ROMulator - I got a few of the latest rev boards in, and while waiting for some assembled boards to come back from a pcb assembler, I managed to get a few built using hot air soldering...
  4. Thanks, this is next up on the project list. This...

    Thanks, this is next up on the project list. This time I may try to implement it using a esp-8266 family MCU so you'd get wifi functionality as well, to host network drives for the PET, and...
  5. Very much interested in doing that. Are there any...

    Very much interested in doing that. Are there any particular features for such a device that you'd be interested in?
  6. Yes, I'll put up the full Verilog source as well...

    Yes, I'll put up the full Verilog source as well as the board schematics. The source is buildable via the open source toolchain for the ice40 fpga, I'll put up some basic tutorials/instructions on...
  7. Another thing to add is that while currently the...

    Another thing to add is that while currently the debug takes place over SPI as described, due to this being an FPGA the same debug pin connection could be used instead as a UART. So if it's useful a...
  8. Regarding the debug port on the ROMulator, ...

    Regarding the debug port on the ROMulator,
    currently the debug works over SPI, using a debug application running on a raspberry pi. The FPGA starts out operating as an SPI master, and reads in its...
  9. It is indeed a UPDuino, the 1.0 version. It's...

    It is indeed a UPDuino, the 1.0 version. It's surprisingly inexpensive (about $10 I believe) and was very useful for development. I've seen some grumbling on FPGA forums about the layout of it, and...
  10. Thanks for the messages, all.. Has been quite a...

    Thanks for the messages, all..
    Has been quite a while since I've been active in the hobby. Had a son a couple of years ago now, and between that and work, haven't had much time for vintage computer...
  11. New project - the ROMulator, successor to the PETvet (RAM/ROM replacement plus debug)

    Hi all,

    I'd like to introduce a project I've been working on for a couple of months now.
    Tentatively called the ROMulator, it's a RAM/ROM replacement board for the Commodore PET (and potentially...
  12. Thanks! I will try these out.

    Thanks! I will try these out.
  13. I should say, the PET model I'm currently using...

    I should say, the PET model I'm currently using for this is an 8032, but the question would apply to any PET model.
  14. Replacing the LOAD routine on a PET.. possible without ROM replacement?

    Hi there,
    Messing around with some PET software development, and I would like to replace the LOAD routine with a custom ML routine located elsewhere in memory.
    I've done this on a C64, which was...
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    Thanks very much, this is quite useful. I rigged...

    Thanks very much, this is quite useful. I rigged up the hard reset switch to ground pin 22 through a 100 ohm resistor, which works well. May include the option to go to the monitor as well.
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    Thanks Robert! At long last getting back into...

    Thanks Robert!
    At long last getting back into some vintage computer activity after a new addition to our family last year.
    The PETpix 2 consists of a small interface for the rPI which connects to...
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    Reset switch for PET 8032

    Hi all,
    I wanted to make a simple reset switch for my 8032, to spare wear and tear on the machine while I mess around with some software development.
    I know the J4 header has /RST on pin 22. Is it...
  18. Has anyone used the ESP8266 wifi microcontroller for any retrocomputing projects?

    May be late to the party with these, but I'm planning to do some hacking around with the ESP8266 wifi microcontroller and connect them up to some of my vintage machines. They are surprisingly cheap...
  19. Wow. Amazing haul! Whenever I see people clearing...

    Wow. Amazing haul! Whenever I see people clearing out a house I always take a second glance, just in case a vintage computer is hiding there, but so far that has never happened. Glad it did happen at...
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    Tips on C64 chain-loading with ML

    Hi all,

    I'm working on some C64 software, and was interested in chain-loading programs with ML. Specifically, I have a menu program which allows you to select between a few different options, then...
  21. Very nice. Does the MZ-800 have a cassette in/out...

    Very nice. Does the MZ-800 have a cassette in/out jack on the back as well? If so you can probably play your MP3-ized software into the computer from the player of your choice (phone, other computer,...
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    It is definitely possible to use the PI...

    It is definitely possible to use the PI standalone, and in fact this has been done before a few years ago, in a very cool project: http://www.lemon64.com/forum/viewtopic.php?t=48991

    You do need...
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    Yup, works with all pi models (0,1,2,3) and only...

    Yup, works with all pi models (0,1,2,3) and only uses the SPI interface on the PI, so you can still use the other GPIO for something else. With the zero being $5 you get a crazy cheap multi-retro...
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    Yet another C64 storage device!

    Hi all,
    I've been away from this forum for a while, and it has been too long! With work and personal stuff accumulating, haven't had much time to spend on vintage computing of late, but hoping to...
  25. Attempting to resurrect an Epson PX-8 Geneva

    Hi all,

    I recently found an Epson PX-8 at an estate sale, and I'm attempting to nurse it back to health. No success so far, but wondering if anyone may have some ideas.
    Here's what I've done so...
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