IBM 6151 Maintenance And Service Manual page 39

Number Test description
88
Displays for one second to provide a lamp test. If "88" is
displayed steady, the 32-bit processor has stopped. :
00, Oc, Ou
If installed, this test resets the IBM Monochrome Display
and Printer Adapter.
01, Ie, lu Tests the ROM modules on the processor board.
02 Tests for correct communication between the 32-bit
processor and the system board.
03, 3c, 3u Tests the memory controller on the processor board and
the system memory boards in slots C and D.
04, 4c, 4u Tests the processor board.
05, 5c, 5u
Tests the processor board.
07, 7c, 7u
Tests the 110 channel controller on the system board.
08, 8c, 8u Tests the 110 channel controller on the system board.
09 Tests the keyboard adapter on the system board and the
indicators on the keyboard.
99
Shows testing was stopped because the keylock is in the
Locked position.
10
Tests the interval timer on the system board.
11
Tests the interrupt controller on the system board.
12 Tests the direct memory access controller on the system
board.
13 Tests the built-in serial ports.
14 Tests the fixed-disk drive adapter.
15 Tests the fixed-disk drive adapter.
16 Tests the diskette drive adapter.
17
Tests the diskette drive adapter.
Beep Tests the speaker in the keyboard.
20 Tests the battery-powered memory on the system board.
(6/88) Diagnostics 2-7