IBM 3745 Series, Hardware Maintenance Reference

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IOC Bus Scoping Routine
The purpose of the PIO scoping routine is to allow scoping of the PIO tags and
data bus.
The following adapters can be exercised using MIOH commands sent from the
MOSS:
Ÿ
CAs
Ÿ LAs
If you are working on a 3745 Model 17A connected to a 3746 Model 900, unplug
the IOC and DMA buses coming from the 3746-900 and plug ITER and DTER ter-
minators (Location 01G-A1 YJ for DMA buses and 01G-A1 ZA for IOC buses).
ITER and DTER terninator cards (PN 66X0521) are available with the shipping
group material.
How to Start the Routine
1. Start the routine by calling routine WA01.
DIAG==> WA01
2. Put in the ADP field the IOC bus number (1) on which scoping is planned.
IOC adapter bus = 1
ADP
≠
==> 1
3. Put the adapter number in the LINE field
LINE==> 3 (for adapter 03)
4. The screen should look like this:
DIAG==> WA01 ADP ==> 1 LINE==> 3 OPT==> N
5. Then press SEND.
A check is made to see if the selected IOC bus can be used, (checking of bits:
enable, present, available, concurrent).
If the conditions are not satisfied for the selection, a message:
'ADAPTER NOT IN CDF', or
'ADAPTER NOT INSTALLED', or
'INVALID REQUEST' is displayed.
If the inputs are correct, a message is then returned to the operator:
'xx ñ 03 ò SELECTED - ENTER : Rooccdddd'
ñ = xx may be TSS, HPTSS, ESS, TRSS, or CA
ò = 03 is the adapter number (3-4 and 9-12)
Chapter 3. Buses
3-53