      +------------------------------------------------------------------------
      |
      |      COMPLEX INTERFACE ADAPTER (CIA) 6526
      |
      +------------------------------------------------------------------------
      |
      |  CIA related topics:
      |
      |   Keyboard Matrix
      |
      |  Register description:
      |
      |  CIA 1:
      |
      |   $DC00/56320/CIA1+0       Data Port Register A
      |   $DC01/56321/CIA1+1       Data Port Register B
      |   $DC02/56322/CIA1+2       Data Direction Register A
      |   $DC03/56323/CIA1+3       Data Direction Register B
      |   $DC04/56324/CIA1+4       Timer A: Low-Byte
      |   $DC05/56325/CIA1+5       Timer A: High-Byte
      |   $DC06/56326/CIA1+6       Timer B: Low-Byte
      |   $DC07/56327/CIA1+7       Timer B: High-Byte
      |   $DC08/56328/CIA1+8       Time-of-Day Clock: 1/10 Seconds
      |   $DC09/56329/CIA1+9       Time-of-Day Clock: Seconds
      |   $DC0A/56330/CIA1+10      Time-of-Day Clock: Minutes
      |   $DC0B/56331/CIA1+11      Time-of-Day Clock: Hours + AM/PM Flag
      |   $DC0C/56332/CIA1+12      Synchronous Serial I/O Data Buffer
      |   $DC0D/56333/CIA1+13      CIA Interrupt Control Register
      |   $DC0E/56334/CIA1+14      CIA Control Register A
      |   $DC0F/56335/CIA1+15      CIA Control Register B
      |
      |  CIA 2:
      |
      |   $DD00/56576/CIA2+0       Data Port Register A
      |   $DD01/56577/CIA2+1       Data Port Register B
      |   $DD02/56578/CIA2+2       Data Direction Register A
      |   $DD03/56579/CIA2+3       Data Direction Register B
      |   $DD04/56580/CIA2+4       Timer A: Low-Byte
      |   $DD05/56581/CIA2+5       Timer A: High-Byte
      |   $DD06/56582/CIA2+6       Timer B: Low-Byte
      |   $DD07/56583/CIA2+7       Timer B: High-Byte
      |   $DD08/56584/CIA2+8       Time-of-Day Clock: 1/10 Seconds
      |   $DD09/56585/CIA2+9       Time-of-Day Clock: Seconds
      |   $DD0A/56586/CIA2+10      Time-of-Day Clock: Minutes
      |   $DD0B/56587/CIA2+11      Time-of-Day Clock: Hours + AM/PM Flag
      |   $DD0C/56588/CIA2+12      Synchronous Serial I/O Data Buffer
      |   $DD0D/56589/CIA2+13      CIA Interrupt Control Register
      |   $DD0E/56590/CIA2+14      CIA Control Register A
      |   $DD0F/56591/CIA2+15      CIA Control Register B
      |
      +------------------------------------------------------------------------

       Back to Mainpage