IBM 6151 Maintenance And Service Manual page 83

22x
I/O Channel Memory Error
Additional Tests: None
Removal Procedure: An error occurred in memory attached to
the I/O channel between memory addresses
080000 and 09FFFF. 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.
23x
IBM AT Serial/Parallel Adapter
Additional Tests: Run the IBM AT Serial/Parallel Adapter
checkouts.
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 IBM AT Serial/Parallel Adapter
Checkouts.
(6/88) Problem Isolation Charts 3-0020-5