Table 1: Parallel Port Pins

  Notes:
    Prefix:  C = control (base+2)
               D = data    (base+0)
               S = status  (base+1)
    Suffix:  '-' for data inverted, '+' data not inverted

  Bit   Pin     Signal
  C5    --      -------   direction bit for bi-directional ports
  C4    --      -------   IRQ enable
  C3-   17      -Select
  C2+   16      -Init
  C1-   14      -AutoFd
  C0-    1      -Strobe

  S7-   11      +Busy
  S6+   10      -Ack
  S5+   12      +PaperEnd
  S4+   13      +SelectIn
  S3+   15      -Error

  D7..D0 9..2   Data