RE: sources of 6529

From: Bil Herd <*bherd_at_mercury-cg.com*> Date: Sat, 16 Jun 2012 13:52:28 -0400 Message-ID: <852dadedc407f0809eb3d374a447d6b8@mail.gmail.com> · bherd_at_mercury-cg.com

Yep, seemed designed for a whole byte of data in that number of pins. Kind
of glad they didn't try to embed more functionality by any kind of pin
re-use or processor controlled commanding, would have been harder to use
as a TTL'ish part.

-----Original Message-----
From: owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Gerrit Heitsch
Sent: Saturday, June 16, 2012 12:11 PM
To: cbm-hackers@musoftware.de
Subject: Re: sources of 6529

On 06/15/2012 02:55 PM, Bil Herd wrote:
> Yeah it was stock, had them "sent up" within an hour.  The chip makes
> a lot of sense as an IO building block, I guess most systems of the
> day were adding I/O as part of timer/counters VIA'ish  most of the time.

There are some downsides to the 6529:

  - No reset input
  - No data direction register.

Each feature would have meant 1 more pin though.

  Gerrit

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