[Info-vax] MicroVAX 2000, SCSI, and OpenVMS 7.3

[glen herrmannsfeldt]

Steven Schweda <sms.antinode at gmail.com> wrote:
>> [...] I didn't get the eraser [...]

>   It's been many years, but I seem to recall a day or two
> facing a normal fluorescent tube doing a good (enough) job.
> (I never tried direct sunlight.)

The numbers are on the data sheet, but I forget them now.

I believe it is days in the sun, weeks under fluorescent lamps.

>> [...] I suspect that they and not been erased completely.

>   Can't a typical programmer verify the initial condition?

Yes, but for marginal bits they are sensitive to conditions,
especially Vcc. 

Programmed bit verification is done with Vcc=6V to be extra
sure. To be sure of erased bits, it should be done below 5V,
but I don't know that any do that.

-- glen