31 Oct
2008
31 Oct
'08
11:54 a.m.
On 31 Oct 2008 at 14:22, Dave McGuire wrote:
> In practical terms, the differential pairs are
RS-422, so they are
> digital, but you need RS-422 drivers and receivers to talk to them
> properly, and termination on the receivers. There are many
> suitable quad driver and quad receiver chips, such as the
> MC3486/3487 and Am26LS31/32.
What I said. In fact, no need for quad devices if you're just
emulating a single drive. There are plenty of dual-unit RS-422
drivers/receivers available.
Is the whole interface spec available anywhere?
How about the ST-412 OEM doc?
http://www.bitsavers.org/pdf/seagate/ST412_OEMmanual_Apr82.pdf
As a matter of fact, on page 21 it states "NOTE: ANY EIA RS-422
DRIVER/RECEIVER PAIR WILL INTERFACE".
Cheers,
Chuck