Path: utzoo!attcan!uunet!husc6!ogccse!blake!uw-beaver!microsoft!w-colinp
From: w-colinp@microsoft.UUCP (Colin Plumb)
Newsgroups: comp.sys.transputer
Subject: Re: Transputer Clock
Message-ID: <51@microsoft.UUCP>
Date: 11 Dec 88 19:56:56 GMT
References: <1407@thumper.bellcore.com>
Reply-To: w-colinp@microsoft.UUCP (Colin Plumb)
Organization: Microsoft Corp., Redmond WA
Lines: 27
Confusion: Microsoft Corp., Redmond WA

In article <1407@thumper.bellcore.com> rtm1@thumper.bellcore.com (Ravi Masand) writes:
>And just what are those "HoldToGround" pins ??

Mostly "reserved" pins, so T8's are plug-compatible with T4's, as are T425's.

One pin I know exists on the T414, which may not be documented for that chip,
(it isn't on the T8) is E1, which diasbles internal RAM (useful for debugging)
when pulled high.

On the T8, you can use the Proc Speed Select pins to select 17.5 MHz, but I
don't know about going any lower.

On the T425, A1 and B3 (Do Not Wire on the T8) are outputs, Refresh Pending
(used to pause external DMA to allow a memory refresh, high indicates the
transputer would like to do a refresh cycle), and Event Waiting (which is
pulled high when a process is waiting on the event channel; it goes low
when Event Ack goes high).

I don't have a T414 data sheet, so I can't compare and see what was added on
the T800.

>P.S. This is the second time I'm posting this - the first time, i suspect,
>it turned to vaporware. If not, I Apologize.

I didn't see it.
-- 
	-Colin (uunet!microsof!w-colinp)