"Michael J. Mahon" <mjmahon@aol.com> wrote in message ofOdnRXaZJMUc_zYnZ2dnUVZ_sadnZ2d@comcast.com">news:ofOdnRXaZJMUc_zYnZ2dnUVZ_sadnZ2d@comcast.com...
: Robert Boucher wrote:
: >>What *are* the specs on the replacement batteries? (They should be 3.6v
: >>and about 60-200mAh.)
: >
: >
: > Specs are 3.6v and 50 mAh
: >
: >
: >>As I mentioned, the battery should be irrelevant when the card is
: >>installed and the computer is on. Can you set the clock under these
: >>conditions? (If the clock has not been set since it was powered off,
: >>it may not be running, which might be detected as "No Device connected"
: >>by the clock software.)
: >
: >
: > How do I set the clock if the computer can't see it? I tried running the
: > BASIC program from both the original disk and the Timemaster owner's
: > manual. Nothing is happening.
:
: The card has ROM on it, which is probably read to detect the card's
: signature.
:
: If the computer can't see the ROM, then something quite unrelated
: to the battery is wrong. I expect the ROM is wired directly to
: the address and data pins, so only the select logic and the ROM
: itself can be the problem.
:
: You might try reading the ROM by plugging it into a slot and
: using the monitor to L)ist some of the $Csxx space. If it looks
: like random video data, then the ROM is not driving the bus.
:
: *Something* must have happened to this card, since the parts we
: are talking about are not usual failures. Any chance of an
: ESD zap while replacing the battery?
I have an AE Serial Pro that I am trying to reconsititute.
The Card is detected, and the clock can be set to a date
and time, but it refuses to run. I've replaced the crystal,
tested the Trim Cap (works), and the Zener diode so far.
Nothing still. If I had more info, schematic, etc.....,
then I might see which components are involved in the clock
circuit. Otherwise, the only other thing I can do is to
replace all of the discrete components, and then check the
TTL on the whole card one by one until it functions.