Table of Contents
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1260GB
Table
5~5.
Command Channel Interface Card, 48·Pin Connector Signals
COMMAND
CARD PIN
. SIGNAL
SIGNAL
GROUND
Act.
("not" AC vohage low)
CMD·*6
CMD·*5
Be
("not" bit clock)
CMD·*C
CMD-*B
BC
(8).
("not" bit clock. buffered)
CMD-*R
-
CB (Control Bit FF)
CMD-*W
-
CRA
("not" clear RPE and ASS FFs)
CMD-*13
-
CR'F
("not" clear Run FF)
CMD-*Z
-
DI (Direction FF)
CMD·*T
-
DI ("not" DI FF)
CMD-*20
-
EwR
("not" end-of-word, read)
CMD·*15
-
_._-
EWW ("not" end-of-word, write)
CMO-*S
-
--
EWW ("not" end-of·word, write)
CMO·*17
-
HC ("not" head change)
CMD·*H
CMD·*J
R
("not" readl
CMD·*4
CMD·*5
RFW (ready for first word)
CMO-*U
-
RI ("not" read inhibitl
CMO·*F
I
CMD-*E
RP (Read Parity FF)
CMD-'V
-
RUN ("not" Run FF)
CMD·*14
-
RY ("not" disc ready)
CMD·*3
CMD-*2
SC ("not" sector clock pulse)
CMD·*A
CMD-*B
STA ("not" strobe track addressl
CMO·*19
-
TO ("not" track origin)
CMO·*l
CMO-*2
TP
'''not'' track protect)
CMD·*16
-
W ("not" write)
CMO-*D
CMD·"E
WRD ("not" Word FF)
CMO·*P
-
NOTES:
.. OAT·· .. identifies a pin in the 48·pin connector for the data channel interface card_
"CMD·*" identifies a pin in the 48-pin connector for the command channel interface card_
"J10-" identifies a pin in Jl0 on the disc memory.
CONNECTED TO:
SIGNAL
GROUND
J10·DD
J10-HH
J10-Y
J10-Z
DAT~'R
-
DAT-*W
-
DAT·*13
-
DAT··Z
-
OAT-*T
-
DAT-*20
-
DAT-*15
-
OAT-'S
-
OAT-*17
-
JlO-K
J10-l
Jl0-U
jl0-V
DAT-*U
--
J10-H
J10-J
DAT-*V
-
DAT-*14
-
Jl0·FF
J10-HH
Jl0-W
Jl0-X
DAT·*19
-
Jl0-E
J10-F
DAT·*16
-
Jl0-S
Jl0·G
OAT-*P
-
A dash for a ground return indicates that the common ground return between cards is used (pins 1, 2. 85, and 86 of the 86'pin
connectorl_ All signals transferred between the two interface cards use the common ground return. Each signal transferred
to
or from the disc uses a separate ground return, with the ground lead and signal lead forming a twisted pair.
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