RAM Check

The computer now begins to check the RAM installed on the main memory card and any option cards. During this check, the screen displays this message:

xxxxxx KB Ok

where xxxxxx indicates the amount of memory in which no malfunction is found. This value increases continuously by 64KB up to the amount of RAM installed. If the computer detects an error in the first 64KB area, an error message appears and the computer halts with no further information.

If there are faulty RAM chips in your system, you see one of these messages:

202-Memory address error203-Memory address error

If an I/O or parity error occurs, you see one of these messages:

Parity check 1

Parity check 2

The program also displays the number of the segment causing the problem.

Keyboard Controller and Keyboard Check

The computer checks the keyboard controller and keyboard for problems such as failure of one of the keys to release.

If there are any errors in the connection between the keyboard and the computer, this error message appears:

301-Keyboard error

When this message is preceded by a number (xx), the number represents the key (in hexadecimal) that is the source of the error.

Power-onDiagnostics B-3