IBM 1 Series - Page 79

I/O channel
I/O pin cable assignment
Line name Direction assignment #1 #2 #3 #4
Data strobe =————g 1:00) B10
Halt or MCHK ome (Vi (7 BO7
Initiate IPL ————eep P()7 D07
IPL Gomes (4 B04
Poll op V1? B12
Poll identifier bit O ————p P)) D11 |
Poll identifier bit 1 = 6)? B02
Poll identifier bit 2 ae S03 BO3
Poll identifier bit 3 ep P12 D12
Poll identifier bit 4 op P[3 D13
Poll prime ep $M 13 B13
Poll propagate —————p- M11
Poll return G———= M04 | B04
Power on reset (see Note) === S05 BOS
Request in bus bit 0 foe S()7 BO7
Request in bus bit 1 G———= 8 BO8
Request in bus bit 2 ——_—— S09 BO9
Request in bus bit 3 ee S10 B10
Request in bus bit 4 ———— 812 B12
Request in bus bit 5 ———— 813 B13
Request in bus bit 6 ——_—s—«;$U02 D02
Request in bus bit 7 —_—_—— U04 D04
Request in bus bit 8 -_ U05 DO5
Request in bus bit 9 <—_——_—s«.:—sdOWU06 D06
Request in bus bit 10 —— 07 D07
Request in bus bit 11 —<— £U09 DO09
Request in bus bit 12 —_—— Ul0 D10
Request in bus bit 13 <_— UI! D11
Request in bus bit 14 —— U12 D12
Request in bus bit 15 —— U13 D13
Service gate —————ee P05 DO5
Service gate return ———— PiI6 D06
Status bus bit 0 ——————ep 13 _ p13
Status bus bit 1 —— Gi3 B13
Status bus bit 2 ——r M03 BO3
Status bus bit 3 > P02 D02
System reset —_——_—— M05 BOS
Note: ‘Power-on reset’ at an I/O socket is the ‘power-on reset’ from the unit power
supply powering the I/O socket. Pin SO5 on the 4955 processor A-socket is not
connected and is jumpered from S05 of the B-socket when an I/O attachment or
repower feature is installed. ‘Power-on reset’ in the I/O channel cable is the unit
‘power-on reset’ from the next outboard I/O expansion unit. -
Figure 2-28 (Part 2 of 2). I/O channel pin and cable assignments—signal lines
2-68 GA34-0033