Re: 2001 repair help

From: Spiro Trikaliotis <*ml-cbmhackers_at_trikaliotis.net*> Date: Fri, 29 Dec 2017 21:51:59 +0100 Message-ID: <20171229205159.GA12863@hermes.local.trikaliotis.net> · ml-cbmhackers_at_trikaliotis.net

Hello Gerrit,

* On Fri, Dec 29, 2017 at 07:26:07PM +0100 Gerrit Heitsch wrote:

> My programmer (an old EPROG27011) uses a 4040 for part of the address lines.
> That's a 12Bit binary counter. I have never looked at the timing on the
> scope though.

It's a 12 bit asynchronous ripple binary counter. This does not sound
very good w.r.t. stable higher address lines A1 and higher while
updating when A0 changes from 1 to 0.

When A0 changes from 0 to 1, it should be stable, though.

Regards,
Spiro.

-- 
Spiro R. Trikaliotis
http://www.trikaliotis.net/

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