IBM 6151 Maintenance And Service Manual page 88

35x
4-Port Asynchronous RS-232C Adapter (Buffered)
Additional Tests: Run the RT PC 4-Port Asynchronous
RS-232C Adapter Checkout.
Removal Procedure: If the adapter is in the system unit, see
Adapter Removal in Section 4, otherwise
see the service information for the unit
where the adapter is installed.
Repair Checkout: Run the RT PC 4-Port Asynchronous
RS-232C Adapter Checkout.
36x
I/O Channel Memory Error
Additional Tests: None
Removal Procedure: An error occurred in memory attached to
the I/O channel between memory addresses
OEOOOO and OFFFFF. This area of memory
is not supported as I/O channel memory in
the IBM RT PC System. Check for
nonsupported memory installed.
Repair Checkout: Run the System Checkout.
3-0020-10 Service Manual