Retina Zorro II Reference
                               by Thomas Huber

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  The Retina ZII is Zorro-II graphics card which enables the A2000, A3000,
  and A4000 to display screens in 8-, 16-, and 24-bit color modes.

  RAM

  The board can have 1M, 2M or 4M of RAM. With 1MB no 24-bit modes are
  available; with 2MB onboard you still can't reach resolutions of 1990x1426
  or 1024x768-24Bit; these resolutions require an upgrade to 4MB.

  For 1MB or 2MB RAM configurations, 414256 chips are used (1Mbit-ZIP-RAM).
  For upgrading the card to its maximum size of 4MB, 4Mbit-ZIP-RAMs like
  414400's must be used in sockets 1,3,5, and 7.

  RAM speeds of 80 ns will work, although the manual recommends the use of 70
  ns, as not all 80 ns RAMs seem to be fast enough.

  The detection of the ramsize is done automatically by the software.

  Troubleshooting

  If the RAM size is detected wrong, or an alert claims the Retina to be
  completely without memory, you can remove the jumper JP. This forces the
  Retina to produce waitstates which might be necessary for the use with some
  accelerator cards.

  Board Layout

                                                              |___
  ____________________________________________________________|
 |                                                            |
 |                                                            |
 |                                                            |
 |              || || || || || || || ||                       |# Video
 |              || || || || || || || ||                       |# Port
 |              || || || || || || || ||                       |# (HDD15)
 |                                                            |
 |               8  7  6  5  4  3  2  1                       |
 |                                                            |
 |                                                JP          |
 |                                                  ..        |
 |____________________________________________________________|
  |||||||||||||||||||||||||||                                 |

  Jumpers

  JP: Wait States
     On: No wait states (Default)
    Off: Enable wait states

  Video Port Pin-Outs (HDD-15)
      Pin 1: Red
      Pin 2: Green
      Pin 3: Blue
      Pin 4: NC
      Pin 5: Ground
      Pin 6: Ground
      Pin 7: Ground
      Pin 8: Ground
      Pin 9: NC
     Pin 10: Ground
     Pin 11: NC
     Pin 12: NC
     Pin 13: Horizontal Sync
     Pin 14: Vertical Sync
     Pin 15: NC