Re: ROMs replacement

From: Gerrit Heitsch <>
Date: Mon, 17 Sep 2012 20:05:31 +0200
Message-ID: <>
On 09/17/2012 07:50 PM, Jim Brain wrote:
> BUt, what does JP301 do in the schematic?  I don't think I accounted for
> it, and I have just glanced at your schematic.

JP301 allows you to have another Kernal image in the EPROM. That way you 
are able to fully use the 27C256:

2 Char-ROM

If JP301 is set, _KERNAL going low means that A13 and A14 of the EPROM 
will go LOW. If JP301 is not set, A13 will be HIGH and A14 will be low 
when _KERNAL goes low.


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Received on 2012-09-17 19:00:55

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