17 Nov
2016
17 Nov
'16
6:07 p.m.
On Thu, Nov 17, 2016 at 3:59 PM, dwight <dkelvey at hotmail.com> wrote:
Do you have working hardware?
No, only a drive that 48-bit ECC. I don't know whether it used a National
Semiconductor based controller, but it doesn't use the Western Digital
polynomial, so NS is my first guess. If it used the DP8466, it might have
used the NS Sooper-Sekrit 48-bit polynomial, or some other polynomial.
A lot can be deduced by using simple data, like all
0's and different
data lengths.
If I got my hands on a DP8496 or DP8497, or a SCSI drive containing one of
them, I might be able to hack up something like you describe in order to
reverse-engineer the polynomials.