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\author{APM Manual pages}
\title{Hardware Diagnostic Facilities}
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\section{Preamble}
There are a few very low-level routines for circuit diagnostics.
These live in the directory MAINT:

\section{CLOF}

Turns the clock off.

This is useful in that if data and address lines are
being examined the processor is prevented from shooting off into the clock ISR
which clutters things up.


\section{DATATEST}

Outputs a recognisable pattern on the data lines.

Pattern is a '1' followed by the data line number (4 bits) followed by another
'1'. Actual pattern is a set of staircases but the data lines are readily
identifiable.

\section{IGRID}

Puts a grid pattern up on the Level 2 graphics monitor

\section{KEY}

Reads the position of the mains switch/key.

\section{PROCTEST}

Stand-alone processor/memory test

BOOT PROCTEST.MOB

\section{WOOF}

Looks for a watchdog timer

Returns ``Passed'' if it found one, \hspace{ 0.2 in} ``Hung up/Failed'' \hspace{ 0.3 in} if it didn't.

\vspace{.75in} view:hwdiag printed on 15/02/89 at 21.07

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