IBM Series 1 User Manual page 184
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The
DPC adapter feature card provides a convenient means of
attaching customer equipment to the processor I/O channel.
To
facilitate
attachment
of
various
devices to the
adapter interface, additional hardware
is
required.
Like
the
processor
I/O
channel,
the
DPC
adapter provides no
functional capability in a stand-alone
configuration.
The
DPC
adapter
can be used for attachment of: typical digital
instruments, another computer, typical data
processing
I/O
equipment (such as low speed readers, punches, or plotters),
or typical commercial data acquisition systems.
GENERAL DESCRIPTION
As previously stated, the DPC adapter can be
configured
to
accommodate
four(4),
eight(8),
or
sixteen(16) I/O device
addresses.
The actual
number
of
devices
connected
when
configured
as
stated
above
is limited by the termination
scheme implemented by the customer.
It is the
function
of
the
termination
scheme
to provide data-buffering hardware
and
control-handshaking
logic
to
expand
the
number
of
attached
devices
to
the
configured
limits.
One common
prepare field (interrupt
level
and
I-bit)
is
shared
by
attached
devices.
The
I/O
device
address configuration
allows for interrupt vectoring for
up
to
16
interrupting
sources
by
individual
device
address.
A
DPC operation
causes a parallel transfer of one 16-bit
word
of
data
or
control
information
to
or from an I/O device.
An Operate
I/O instruction must be executed
for
each
data
transfer.
Oata bus parity is checked.
When parity is not generated by
an I/O device on the input data bus, internal
circuitry
on
the feature card generates odd parity.
FUNCTIONAL DESCRIPTION OF THE DPe
ADAPTER SIGNAL LINES
The DPe adapter has 75 lines that can be subsetted depending
upon the level of functions
required
by
the
I/O
device.
Bits 1--3 and bits 4--7 of the command field in the Inca are
mapped into DPC adapter function bits (3 bits) and
modifier
bits
(q
bits), respectively.
Bits 12, 13, 14, and 15 of the
device address field in the IDCB are
mapped
into
the
DPC
adapter
device
address
bits.
If
the
DPC
adapter
is
configured for less than 16 I/O devices, bits 12 and 13
are
truncated
as
necessary
and
replaced
by
zeros in the DPC
adapter device address bits.
Device addresses should
start
at the lovest configured device address.
The following is a
list of all the I/O lines available between the DPe
adapter
and attached devices:
Customer
ope
Adapter
6-3
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