Apr 19th Update

  • :( – not started yet //cmxp going to start looking at 65SPI and SDCard circuit next
  • Started working on this a week or so ago

  • To start with I repurposed a 4×6 perf board that already had a XC9572XL on it that I did my original devsel testing on. That’s it’s main function along with inverting the apple2 read/write signal for the sn74LVCCC4245A OCTAL DUAL-SUPPLY BUS TRANSCEIVER
  • The SPI logic is a copy of the code from Daryl Rictors 65SPI project. My thanks go out to Daryl for sharing this code with the community and patiently answering all my questions about it.
  • The code is running in a EZ-DIGITAL XC95144XL-TQ100 breakout board I purchased from Justin.
  • Murphys law came into effect when I inadvertently set an inversion flag on one of the Logic Analyzer probes which was attached to the MISO line. This stumped me for awhile.
  • Next up is to write some software to make a loadable disk driver for ProDOS so I can test things out in general. I want to see if the SPI controller runs into the same glitch on the IIc+ as my sram interface did.
  • Currently wired is a standard SDCard conenctor. I also have a MicroSD card connector wired up for the second SPI device. The third SPI device will be a wifi-card it is surface mountable so I need to make a mini break out for it.
  • The compact flash interface is mounted but needs to be wire wrapped to the remaining available pins on the CPLD.

2 Responses to “Apr 19th Update”

  1. Nick Westgate Says:

    Nice to see you’re making progress!

    Looking forward to mass storage in a //c … and hopefully one of the 2 VGA dongles in development will make it to production too.

    Cheers,
    Nick.

  2. a2retro Says:

    Yes.. read my first sector successfully tonight … used the MMC card I got with my pseudo disk. Compared the buffer to the sector dump of the same media via Ciderpress. :)

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