Re: 6522 VIA inputs

From: silverdr_at_wfmh.org.pl Date: Mon, 24 Apr 2017 22:28:27 +0200 Message-Id: <FC1E023B-5182-460C-850B-3DE245B9F990@wfmh.org.pl>

> On 2017-04-23, at 00:54, Segher Boessenkool <segher@kernel.crashing.org> wrote:
> 
>>> The MOS 6522 datasheet can be downloaded from here:
>>> http://6502.org/documents/datasheets/mos/
>>> 
>>> The port drivers are on page 3 of the PDF.  The Rockwell and Synertek 6522 datasheets are also on 6502.org.
>> 
>> Got those, thanks.
> 
> The datasheet shows a depletion-mode FET (with source tied to gate) for
> the pull-up / keeper.  The schematic agrees, and so does the chip.  The
> schematic shows a depletion-mode FET for the high-side driver as well,
> and that is what is on the chip; the datasheet shows an enhancement FET
> instead though.

You mean the MOS datasheet / schematic / chip, right?

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