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From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.sys.amiga
Subject: Re: mount vs. 3.5" drives & diskchange
Message-ID: <2168@cbmvax.UUCP>
Date: Wed, 29-Jul-87 21:10:29 EDT
Article-I.D.: cbmvax.2168
Posted: Wed Jul 29 21:10:29 1987
Date-Received: Sat, 1-Aug-87 01:04:21 EDT
References: <641@neoucom.UUCP> <2165@cbmvax.UUCP>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 16

In article <2165@cbmvax.UUCP> daveh@cbmvax.UUCP (Dave Haynie) writes:
> in article <641@neoucom.UUCP>, wtm@neoucom.UUCP (Bill Mayhew) says:
> > There is a PAL chip on the drive interface board.
> 
> Actually, it's usually an open-collector NAND gate and a D-type flip
> flop.  The original external 3.5" drive uses a 74LS38 and a 74LS74 
> for this function...

Some of the drives do have a strangely marked Japanese branded DIP.  It turns
out that this part is, in fact, comparable to a 74LS38, a high-current, open
collector TTL driver.

-- 
George Robbins - now working for,	uucp: {ihnp4|seismo|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)