Re: ROMs replacement.. solved!

From: Gerrit Heitsch <>
Date: Thu, 18 Oct 2012 18:52:47 +0200
Message-ID: <>
On 10/18/2012 02:28 PM, Steve Gray wrote:
> Why stop there? Replace the TTL with micro-sized versions, mount them inbetween the pin header on the bottom, and make the board the same size as the eprom!
> Just kidding!  ;-)

No, the next step would be to design one such circuit for a 250469 
board, the one where the BASIC and KERNAL are in one ROM and only the 
char-ROM is extra.

Should be a bit easier since _KERNAL and _BASIC are already added 
together by an AND gate on the board. That way one doesn't need a 
74LS11, a 74LS08 should do.


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Received on 2012-10-18 17:00:04

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