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SolidState

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SolidState last won the day on January 4

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  1. I've bit-banged the PS/2 protocol by inhibiting the clock and checking it periodically (15 times per second). I tested against a wide range of keyboards and found it can take up to 4000us for some keyboards to respond when the clock is released. And I would say it is often the case that a keyboard will respond fast (within 100us) and then take a while (>2000us) on a fairly random basis. I have the Perixx keyboard (the same model planned for this project) and it tends to be more on the temperamental side. I think that's why bit-banging with the 6502 has been abandoned and the plan is to now use the AVR processor for the keyboard interface.
  2. David hasn't checked this forum in over three weeks and frankly I don't blame him. His interests and productivity lie elsewhere. There is still substantial technical work to do here and even a basic kit release will involve a financial risk I doubt anyone is willing to take. Someone will need deep pockets or start remortgaging property when the unforeseen crowd funding logistics go wrong. I think the only way forward at this point is to open source the entire project. Sharing all the details with the community will bring in the missing resources and energy to help push this over the line. There could be a sunk cost fallacy here though and that might explain why things have stalled out in this near-permanent limbo.
  3. Me too From what I understand these are volatile devices, so it forgets all the "circuitry" when powered off. The serial FLASH is used to store the firmware/RAM image and it gets pulled into the chip on power up. The VERA board would be the same way and probably has an identical FLASH chip on it.
  4. What was posted was a complete standalone project. I have a copy of the following repos: commanderx8 / x8-emu - emulator commanderx8 / x8-rom - X8 ROM containing BASIC and KERNAL commanderx8 / x8-fpga - FPGA image in Verilog commanderx8 / x8-pcb - KiCAD files of schematic/PCB I played around with it using an iCEBreaker board a few months ago. I can't remember if that board had enough I/O breakout to support everything. If it did then could create an X8 breakout board for the iCEBreaker ecosystem. I'm buried in another project so didn't pursue it much further. It looks like there's close to 100 people interested in an X8 board, so this might be one way to get them the hardware. It's amazing how much work went into the X8 now I take another look at it. I don't understand why you wouldn't release it.
  5. What was posted was a complete standalone project. I have a copy of the following repos: commanderx8 / x8-emu - emulator commanderx8 / x8-rom - X8 ROM containing BASIC and KERNAL commanderx8 / x8-fpga - FPGA image in Verilog commanderx8 / x8-pcb - KiCAD files of schematic/PCB I played around with it using an iCEBreaker board a few months ago. I can't remember if that board had enough I/O breakout to support everything. If it did then could create an X8 breakout board for the iCEBreaker ecosystem. I'm buried in another project so didn't pursue it much further. It looks like there's close to 100 people interested in an X8 board, so this might be one way to get them the hardware. It's amazing how much work went into the X8 now I take another look at it. I don't understand why you wouldn't release it.
  6. The board has a Wifi UART. It provides a basic AP that you connect to and then telnet to the board to establish a serial connection. You could also do TFTP to transfer files to/from the memory.
  7. There was a discussion about the X8 files on this thread. It looks like the repos were made private, but I think there are some forks out there (the image was a render I did just now from KiCAD).
  8. I'm not sure what all the trepidation is all about. Frank released the entire design files for the X8 under a 2-Clause BSD License at the end of last year. The Cloanto IP makes it a bit problematic to build and ship as a finished product though. It could be done as a "dev kit" and you get to flash the firmware. The board comes with an integrated Cortex-M0 host processor, so it's already setup for this.
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