IBM PC hacking

[Vintage Computer Festival]

On Tue, 27 Sep 2005, Jim Leonard wrote:

> While it is rare that a minor error will surface in, say, the CPU (I have NEVER
> seen a CPU go gradually, like "whoops, now I can't ADD or SHL" -- it's all or
> nothing), the diagnostics run in something like 1K of ROM with no memory use
> other than video so they are helpful in diagnosing RAM problems.  And the
> sound, joystick, video, and floppy drive tests are helpful in determining if
> the machine is functional on a basic level -- I always run them on any new PCjr
> I come across to determine if it's worth hauling away or not :-)

Hey Jim.

How do you access the diagnostics?

-- 

Sellam Ismail                                        Vintage Computer Festival
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