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Re: [Fwd: zs and less that 8bit modes]

To: (Gleb O. Raiko)
Subject: Re: [Fwd: zs and less that 8bit modes]
From: Pete Zaitcev <>
Date: Wed, 24 Nov 1999 09:44:57 -0800 (PST)
In-reply-to: <> from "Gleb O. Raiko" at "Nov 24, 99 12:35:07 pm"
> Subject: zs and less that 8bit modes
> Date: Wed, 24 Nov 1999 12:30:00 +0300
> From: "Gleb O. Raiko" <>
> Organization: NIISI RAN
> To:
> The problem Zilog sets high bits in received chars and X server doesn't
> like it. In order to operate, the serial mouse protocol requires 7bit
> mode, then X gets 8bit char with high bit set and thinks it should
> process that char. [...]

Historically this was the way many ancient pieces of hardware
operated. I observed it myself many years ago. This does not
mean they were not broken by design, and there was some evolution
since days of PDP-11/24.

> So, I have 2 choices: either 'fix' the zs driver (what I have made
> already, the driver stores mask depending on receive mode and applies
> the mask on every byte it receives) or fix the X server. Then, again, I
> am not sure X is a single application that have this behavior.

I would say, fix both. Be liberal in what you accept and be
conservative in what you produce.


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