Yamaha CS1D Operating Manual page 24

It is not possible to install and use a total of five or
more AP8AD/AP8DA cards. Also, if you are using
AP8AD/AP8DA cards simultaneously with MY8-
AD/MY4-AD/MY4-DA cards, there are restrictions
on the number of cards, as described below. Never
exceed the allowable number of cards, since
attempting to use a greater number of cards than
allowed may damage the DIO8 due to excessive
current. If you are not using AP8AD or AP8DA
cards, or if you are using AP8AD or AP8DA cards
simultaneously with an MY8-TD/MY8-AT/MY8-
AE card, there is no limitation on the number of
MY8-TD/MY8-AT/MY8-AE cards that can be used.
[MY8-AD] +
[AP8AD] +
[MY4-AD] +
[AP8DA] cards
[MY4-DA]
used
cards used
Total 0 cards Up to a total of 8 cards
Total 1 card Up to 6 cards
Total 2 cards Up to 4 cards
Total 3 cards Up to 2 cards
Total 4 card Up to 1 card
Total 5 or more
cards cannot —
be used
[MY8-TD] +
[MY8-AT] +
[MY8-AE] cards
used
Up to the number
of vacant DIO8
slots
Up to the number
of vacant DIO8
slots
Up to the number
of vacant DIO8
slots
Up to the number
of vacant DIO8
slots
—
Introducing the various components
3