We have now found two errors and one warning with the 16-bit IDE
card. Once worked around the card works successfully.

1: 1MHz connector

Not an error, but a warning. You must not use a right-angle IDC
header for the 1MHz connector. You must use a straight connector
with the notch on the side towards the edge of the board.

2: RD/WR supplied from wrong pins

The RD and WR lines come from pins 11 and 12 of IC U103. They
should come from pins 9 and 10. To correct this do the following:

* On the top of the PCB cut the track running from IC U103 pin 11.
* On the top of the PCB cut the track running from IC U103 pin 12.
* On the bottom of the PCB solder a link from IC U106 pin 5 to IC U103
  pin 9.
* On the bottom of the PCB solder a link from IC U106 pin 9 to IC U103
  pin 10.

3: RD/WR swapped at IDE connector

The RD and WR lines are wired the wrong way around at the IDE
connector. To correct this do the following:

* On the top of the PCB cut the track running from IC U106 pin 2
  to IDE pin 25.
* On the top of the PCB cut the track running from IC U106 pin 12
  to IDE pin 23.
* On the bottom of the PCB wire a link from IC U106 pin 2 to IDE
  pin 23.
* On the bottom of the PCB wire a link from IC U106 pin 12 to IDE
  pin 25.