8 Nov
2005
8 Nov
'05
6:29 a.m.
For the 7970 tape drive there ARE the full schematics
on bitsavers...
the 7970 series was built by HP, the 7879 is was OEM-ed from STC .
I may have an STC manual somewhere, though it will take some digging.
They weren't particularly reliable even when they were new.
fwiw
By the mid 80s, almost none of HP's 'service' manuals had schematics.
8 Nov
8 Nov
6:44 a.m.
Al Kossow wrote:
Are you sure? The 7976 was an STC drive, brought in because HP didn't
have a 6250 BPI drive and this was starting to hurt sales by 1983 or
so. I understood the 7978 to be HP's design.
-Frank McConnell
For the 7970
tape drive there ARE the full schematics on bitsavers...
the 7970 series was built by HP, the 7879 is was OEM-ed from STC . 
2:45 p.m.
> the 7970 series was built by HP, the 7879 is was
OEM-ed from STC .
I have a HP7978B drive...
Are you sure? The 7976 was an STC drive, brought in
because HP didn't
have a 6250 BPI drive and this was starting to hurt sales by 1983 or
so. I understood the 7978 to be HP's design.
On the power supply's pcb I
find an etched HP logo.... So why should the rest be oem?
Btw: When the psu was still working my machine came up with no error in self test...
Is ist possible that not every commercially available tape hat an eot mark?
Regards,
Philipp :-)
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aek＠bitsavers.org -
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hachti＠hachti.de