8T26 buffers (was Re: Tandon TM 100 5 1/4" drives)

From: Richard Erlacher <edick_at_idcomm.com>
Date: Wed Oct 20 18:53:24 1999

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_at_brouhaha.com>
To: Discussion re-collecting of classic computers
<classiccmp_at_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.
Received on Wed Oct 20 1999 - 18:53:24 BST