J-CIA - MOS 6526 / 8521 / 8520 FPGA REPLACEMENT

J-CIA, J6526, FPGA 6526 / 8521

FPGA 6526 - J-CIA - J6526 - MOS6526 - MOS8521 - MOS 8520
* BETA TESTING PHASE *
Modern spare part for C64 - Commodore 64 - C128 - Commodore 128 - Amiga

  • FPGA based replacement for MOS 6526 & 8521 CIA chips
  • Project started in 2018. First prototypes delivered to beta testers in april 2020.
  • Complete logic and all features of the original IC's implemented
  • All diagnostic & software tests passed 100%, including all tests in Wolfgang Lorenz's test suite and Vice-project's CIA-tests.
  • Hundreds of demos and games already tested, no known compatibility issues currently
  • Physically about the same size as the original CIAs
  • Lots of hardware tested and found to be compatible including (but not limited to) WifiModem, Ultimate-II+, SD2IEC, TapeCart
  • Tested with all C64 mainboard revisions, Commodore 128 (including CP/M) and 1570 & 1581 disk drives. Works in 1 MHz and 2 MHz modes.
  • J-CIA is in beta testing phase, no estimate of a finished product availability or pricing yet
  • Currently (June 2020) working on Amiga 8520 mode and the final PCB layout
  • BACK / J-VIC / J-CPU / VIDS

    2020-2022 Jani Laatikainen