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\begin{document}

\begin{centering}
\large\bfseries\sffamily
Tape and SIO Connectors\\[10pt]
\end{centering}

Tape Connector pins are taken from Figure 16 on page 26 of A24-1424-0 {\bf
Reference Manual 1401 Data Processing System Original Equipment
Manufacturers' Information}.

SIO Connector pins are taken from Figure 42 on page 72 of S23-5013 {\bf
Customer Engineering Manuals Supplement}, which is the same as Figure 22
on page 26 of Form 223-2644 (the latter being of better quality). The
instruction portion is a supplement to {\bf 7040-7044 Data Processing
System, Input-Output-Channel A Operations}, Form R23-2652. The figures are
a supplement to {\bf Customer Engineering Reference Manual, IBM 7040-7044
Data Processing System Channel A}, Form 223-2644. S23-5013 was not to be
taken as a definitive instruction-reference manual, but rather for the
sole purpose of supplying information on interface 5 until revision of the
above manuals was completed.

\begin{longtable}{l|l|l|l|}
Pins & \multicolumn{1}{c|}{Tape Connector}& \multicolumn{2}{c|}{SIO Connector}\\
\hline
\endfirsthead
Pins & \multicolumn{1}{c|}{Tape Connector}& \multicolumn{2}{c|}{SIO Connector}\\
\hline
\endhead
1--2     & $-$N: Turn On                & +U: A$-$Reg Sel 1               & +U A$-$Reg Sel 2            \\
3--4     & +P: Turn Off                 & +U: A$-$Reg Sel 4               & $-$T: Force Odd Redundancy  \\
5--6     & +P: Go                       & $-$U: Disc Latch Reset In       & +U: Not I$-$O Read Call     \\
7--8     & $-$N: BKWD                   & +U: Select I$-$O Attach Out     & $-$T: Reset A$-$Reg Error   \\
9--10    & $-$N: Start Rewind           & +U: Set Write Latch In          & +U: Set Read Latch In or Disc \\
11--12   & $-$N: Set Write Status       & +U: Set Error Latch In          & $-$T: I$-$O Trans EOR       \\
13--14   & +P: Set Read Status          & $-$T: I$-$O Trans 1             & +U: I$-$O Disc Out 1        \\
15       & Empty                        & +U: I$-$O Disc Out 2            & Empty                       \\
16--17   & Empty                        & +U A$-$Reg Not 1 2              & +U: A$-$Reg AB              \\
18--19   & Empty                        & +U: A$-$Reg A Not B             & $-$T Force Odd Redundancy 1 Out \\
20--21   & +P: Sel and Rdy Mod IV       & $-$U: Disc Latch Reset Out      & +U: Not I$-$O Read Call     \\
22--23   & $-$N: Sel and T.I. On        & +U: Set I$-$O Latch In          & $-$T: Reset A$-$Reg Error 1 \\
24--25   & $-$N: Sel and T.I. Off       & +U: Set Write Latch Out         & +U: Set Read Latch Out      \\
26--27   & +P: Sel and at Ld Pt         & +U: Set Error Lateh 1 Out       & $-$T: I$-$O Trans 2         \\
28--29   & +P: Sel and not at Ld Pt     & +U: Select 1 Out                & +U: Select 1 In             \\
30       & Empty                        & +U: I$-$O Disc In               & Empty                       \\
31--32   & +P: Sel and Rdy Mod II       & +U: A$-$Reg B Not A             & +U: A$-$Reg 2 Not 1         \\
33--34   & +P: Sel and Read only        & +U: A$-$Reg Not 8 4             & +U: A$-$Reg 4 Not 8         \\
35--36   & +P: Sel Ready and Write      & +U: A$-$Reg 1 Not 2             & +U: +6V                     \\
37--38   & $-$N: Sel and Rewind         & +U: Not Start Reset Out         & +U: Start Reset             \\
39--40   & +P: Rewind and Unload        & +U: Start Reset Out             & +U: Data C Out              \\
41--42   & +P: Set Hi Density           & +U: Service Request Out 1       & +U: Service Request Out 2   \\
43--44   & $-$N: Set Lo Density         & +U: Service Request In          & +U: A$-$Reg 1 2             \\
45       & Empty                        & +U: A$-$Reg 8 Not 4             & Empty                       \\
46--47   & +P: Hi Density               & $-$T: Sel I$-$O Out             & $-$T: Sel I$-$O In          \\
48--49   & Shield and Spare             & $-$T: Force Odd Redundancy 2    & +U: Data C Load or Move In  \\
50--51   & Empty                        & $-$T: I$-$O Write Call In       & $-$T: I$-$O Write Call Out  \\
52--53   & Empty                        & $-$C: I$-$O  Ready (Overlap)    & I$-$O  Ready (Overlap)      \\
54--55   & Empty                        & $-$T: Not Sel I$-$O Out         & $-$T Not Sel I$-$O In       \\
54--55   & Empty                        & \multicolumn{2}{c|}{(Block Readdress)}                        \\
56--57   & Empty                        & +U: Data C Load Or Move Out     & Emergency Off Switch        \\
58--59   & Empty                        & Emergency Off Switch            & 1401 Is Stopped             \\
60       & Empty                        & 1401 Is Stopped                 & Empty                       \\
61--62   & Empty                        & Empty                           & Empty                       \\
63--64   & Empty                        & Empty                           & Empty                       \\
65--66   & Empty                        & Empty                           & Empty                       \\
67--69   & Empty                        & Empty                           & Empty                       \\
69--70   & Empty                        & Drop 1401 Power                 & Drop 1401 Power             \\
72--73   & Empty                        & Empty                           & Empty                       \\
73--74   & Empty                        & Empty                           & Empty                       \\
75       & Empty                        & Empty                           & Empty                       \\
76--77   & Empty                        & Empty                           & Empty                       \\
78--79   & +P: Select TU 1              & Empty                           & Empty                       \\
80       & Empty                        & Empty                           & Empty                       \\
81       & Empty                        & Empty                           & Empty                       \\
82--83   & 8V PP: Read Bus 1            & $-$C: Single Character Transfer & Single Character Transfer   \\
84--85   & 8V PP: Read Bus 2            & $-$C: 1401 Reset                & 1401 Reset                  \\
86--87   & +P: Select TU 2              & $-$C: I$-$O Transfer 1 (Error)  & I$-$O Transfer 1 (Error)    \\
88--89   & +P: Select TU 3              & $-$C: I$-$O Transfer 2          & I$-$O Transfer 2            \\
90       & Empty                        & $-$C: I$-$O Transfer 3          & Empty                       \\
91       & Empty                        & $-$C: End of Transmission       & Empty                       \\
92--93   & 8V PP: Read Bus 4            & End of Transmission             & $-$C: I$-$O Readdress       \\
94--95   & 8V PP: Read Bus 8            & I$-$O Readdress                 & $-$C: I$-$O Process Check   \\
96--97   & +P: Select TU 4              & $-$C: I$-$O Transfer 4          & I$-$O Transfer 4            \\
98--99   & +P: Select TU 5              & $-$C: I$-$O Transfer 5          & I$-$O Transfer 5            \\
100      & Empty                        & I$-$O Transfer 3                & Empty                       \\
101      & Empty                        & $-$C: I$-$O Time 000$-$030      & Empty                       \\
102--103 & 8V PP: Read Bus A            & I$-$O Time 000$-$030            & $-$C: I$-$O Time 030$-$060  \\
104--105 & 8V PP: Read Bus B            & I$-$O Time 030$-$060            & I$-$O Process Check         \\
106--107 & +P: Select TU 6              & $-$C: I$-$O Transfer 6          & I$-$O Transfer 6            \\
108-109  & Empty                        & $-$C: I$-$O Transfer 7          & I$-$O Transfer 7            \\
110      & Empty                        & $-$C: Reset Transmission Error Latch & Empty                       \\
111      & Empty                        & $-$C: I$-$O Output WM           & Empty                       \\
112--113 & 8V PP: Read Bus C            & I$-$O Output WM                 & $-$C: I$-$O Service Request \\
114--115 & Shield and Spare             & I$-$O Service Request           & $-$C: Select I$-$O Service Attach \\
116--117 & Empty                        & $-$C: I$-$O Transfer 8          & I$-$O Transfer 8            \\
118--119 & Empty                        & $-$C: Service Response (1401 SVC Request & Service Response (1401 SVC Request \\
120      & Empty                        & Reset Transmission Error Latch  & Empty                       \\
121      & Empty                        & $-$C: I$-$O Attachment Write Call & Empty                     \\
122--123 & Shield and Spare             & I$-$O Attachment Write Call     & $-$C: I$-$O Attachment Read Call \\
124--125 & Shield and Spare             & I$-$O Attachment Read Call      & Empty                       \\
126--127 & Empty                        & $-$C: I$-$O Time 090$-$000      & I$-$O Time 090$-$000        \\
128--129 & Empty                        & $-$C: I$-$O Time 060$-$090      & I$-$O Time 060$-$090        \\
130--131 & Empty                        & $-$C: I$-$O 14 Select           & I$-$O 14 Select             \\
132--133 & +6V                          & $-$C: I$-$O Selecting Unit      & I$-$O Selecting Unit        \\
134--135 & Empty                        & $-$C: I$-$O Attention Light     & I$-$O Attention Light       \\
136--137 & Empty                        & $-$C: I$-$O Discionnect         & I$-$O Discionnect           \\
138--139 & Empty                        & $-$C: I$-$O 9 Select            & I$-$O 9 Select              \\
140      & $-$6V                          & $-$C: I$-$O 8 Select          & Empty                       \\
141--142 & Empty                        & $-$C: I$-$O 1 Select            & I$-$O 1 Select              \\
143--144 & Empty                        & $-$C: I$-$O 2 Select            & I$-$O 2 Select              \\
145--146 & Empty                        & $-$C: I$-$O 3 Select            & I$-$O 3 Select              \\
147--148 & Empty                        & $-$C: I$-$O 4 Select            & I$-$O 4 Select              \\
149--150 & Empty                        & $-$C: I$-$O 5 Select            & I$-$O 5 Select              \\
151--152 & Empty                        & $-$C: I$-$O 6 Select            & I$-$O 6 Select              \\
153--154 & Empty                        & $-$C: I$-$O 7 Select            & I$-$O 7 Select              \\
155      & Empty                        & I$-$O 8 Select                  & Empty                       \\
156--157 & Empty                        & $-$C: I$-$O 10 Select           & I$-$O 10 Select             \\
158--159 & Empty                        & $-$C: I$-$O 11 Select           & I$-$O 11 Select             \\
160--161 & Empty                        & $-$C: I$-$O 12 Select           & I$-$O 12 Select             \\
162--163 & Ground                       & $-$C: I$-$O 13 Select           & I$-$O 13 Select             \\
164--165 & Empty                        & $-$C: I$-$O Unit 1 Control      & I$-$O Unit 1 Control        \\
166--167 & Empty                        & $-$C: I$-$O Unit 2 Control      & I$-$O Unit 2 Control        \\
168--169 & Empty                        & $-$C: I$-$O Load                & I$-$O Load                  \\
170      & $-$12V                       & $-$C: I$-$O Input WM            & Empty                       \\
171--172 & $-$N: Write Bus 1            & $-$C: I$-$O Input 1             & I$-$O Input 1               \\
173--174 & $-$N: Write Bus 2            & $-$C: I$-$O Input 2             & I$-$O Input 2               \\
175--176 & $-$N: Write Bus 4            & $-$C: I$-$O Input 4             & I$-$O Input 4               \\
177--178 & $-$N: Write Bus 8            & $-$C: I$-$O Input 8             & I$-$O Input 8               \\
179--180 & $-$N: Write Bus B            & $-$C: I$-$O Input A             & I$-$O Input A               \\
181--182 & $-$N: Write Bus A            & $-$C: I$-$O Input B             & I$-$O Input B               \\
183--184 & $-$N: Write Bus C            & $-$C: I$-$O Input C             & I$-$O Input C               \\
185      & Empty                        & I$-$O Input WM                  & Empty                       \\
186--187 & Spare and Shield             & $-$C: I$-$O Output 1            & I$-$O Output 1              \\
188--189 & Spare and Shield             & $-$C: I$-$O Output 2            & I$-$O Output 2              \\
190--191 & Spare and Shield             & $-$C: I$-$O Output 4            & I$-$O Output 4              \\
192--193 & $-$N: Write Echo Pulse       & $-$C: I$-$O Output 8            & I$-$O Output 8              \\
194--195 & $-$N: Reset Wr Toggles       & $-$C: I$-$O Output A            & I$-$O Output A              \\
196--197 & $-$N: Write Pulse            & $-$C: I$-$O Output B            & I$-$O Output B              \\
198--199 & Empty                        & $-$C: I$-$O Output C            & I$-$O Output C              \\
200      & Empty                        & Empty                           & Empty                       \\
\end{longtable}

Signal is specified for the first pin in the tape connector, and for the specified pin in the SIO connector.

\end{document}
