1 Feb
2021
1 Feb
'21
10:36 a.m.
On Mon, Feb 1, 2021 at 10:54 AM Paul Koning via cctalk <
cctalk at classiccmp.org> wrote:
Looking at the DEC Pro documentation there's some
ambiguity I'm trying to
figure out.
The hard drive documentation talks about the "reduced write current"
signal. In one place it's explicitly described as relevant to the RD50
only. But later on in the RD50/RD51 chapter the signal is described
generally, without any indication that RD51 ignores it.
Does anyone know which is correct? If RD51 also uses it, how does the
right value get set? What IS the right value, anyway?
The RD51 was the ST-412 while the RD50 was the ST-506. There's a combined
OEM manual for these drives.
http://www.bitsavers.org/pdf/seagate/ST412_OEMmanual_Apr82.pdf which has
the answer. It's used in the ST406, but ignored in the ST-412. See Page 16
for the notes.
Based on that, I think it's pretty safe to say the RD50 needed it, but the
RD51 and newer did not.
Warner