20 Oct
1999
20 Oct
'99
2:53 p.m.
The National Semi DP8304 is a bidirectional bus buffer, but the 8T26 and
8T28 were only for a bidirectional bus on one side. The other side was
separate in and out. They're not uncommon on S-100 boards. The DP8304 is
bidirectional on both sides, like a '245. In fact it's exactly the same as
the i8286.
Dick
-----Original Message-----
From: Eric Smith <eric(a)brouhaha.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Wednesday, October 20, 1999 4:46 PM
Subject: 8T26 buffers (was Re: Tandon TM 100 5 1/4" drives)
> Not that I normally advocate this sort of
cannibalism, but does not the
> Apple ][ use 8T26 bus buffers? They certainly are more common than OSI
gear.
No. Early Apple ][ used an octal bidirectional buffer whose exact part
number I've forgotten, but it was something like 8308. Later revs replaced
it with the 74LS245, which was not pin compatible. Some boards were
dual-patterned to accept either, although the socket was installed for
one, precluding the use of the other.
8T26 chips are not that hard to find. I can probably supply some
if anyone needs them, although I'll charge a premium to cover my
handling costs.