Re: External Kernal PDF

From: Jim Brain <brain_at_jbrain.com>
Date: Sat, 20 Nov 2010 22:53:17 -0600
Message-ID: <4CE8A5BD.1080604@jbrain.com>
On 11/20/2010 10:30 AM, Ruud@Baltissen.org wrote:
> http://www.baltissen.org/files/extkernal.pdf
>
> In a hurry so I hopes things worked out fine.

My German is non-existent, but this looks like it's working with delay 
lines and interpreting some glitch in the addressing.

An English translation of the article would help clarify...

G1/G2 look to be simple R/C delays, so G8 gets !PHI2(delayed) * BA = !BF

I just wish I understood what condition the schematic is looking for.  
Does ROMH glitch when RAM is due for access as opposed to ROM?

Inquiring minds want to know.


Jim

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Received on 2010-11-21 05:00:02

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