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SOURCE DEFINITIONS
The possible sources in ROWS B, C, and D are
defined as follows.
B0-B6
B0-B6 are status signals used for the SIO
channel. Note that B l , (SIOS) is a logical
OR'ing of PE, FE, and OE. If this signal is
used, the Control Port output word allows the
User to decode this signal to determine which
error (PE,FE,or OE) occurred. This is covered
in CONTROL PORT OUTPUT FUNCTIONS.
C0-C6
CO is the Serial Data which is to be input to
the SIO Channel.
Cl (CL1) is the Current Loop Receiver for the
SIO Channel.
C2-C7 are status signals used for the two PIO
channels. Note that C2 and C3 are the logical
OR'ing of the signals I1DA, 01DR, I2DA, and
02DR. If C3
(PIOS) is used, the Control Port
output word allows the User to decode this
signal to determine which of the four error
lines is active. This is covered in the section,
CONTROL PORT OUTPUT FUNCTIONS.
D0-D7
D0-D3 provide for 4 EIA Receivers to be used
with the SIO Channel.
D4 is a status line used for the Cassette
Channel to indicate when a bit or byte is ready.
D5-D7 provide for three TTL level inputs for
the SIO Channel.
E0-E7
E0-E7 provide for 8 Ground points.
FG-F7
F0-F7 provide for the 8 Vectored Interrupt
L ines.
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