Re: 264/TED/Plus4 Story

From: Gerrit Heitsch <>
Date: Sun, 30 Oct 2011 18:18:51 +0100
Message-ID: <>
On 10/30/2011 12:46 AM, crock wrote:
> Here's a selection of pics of the Commodore 232.

Thank you for the pictures.

The whole system looks production ready to me, but the kernel ROM with a 
-01 rev is a bit old. It should run with a -05 just as well. Did you 
ever try that?

The interesting part about it is the RAM setup using 4 x 4416. Since TED 
only generates _RAS and _CAS for a single RAM bank this will have to be 
split up externally, probably using A13 to select the proper bank by 
somehow gating _CAS (_RAS needs to be on all RAMs to allow proper 
Refresh). The only difference in TTLs I can find compared to a Plus/4 or 
C16 are 2 TTLs, a 74LS74 (U17) and a 74LS32 (U13, datecode 7932?) which 
is not quite what I expected. The circuit I had in mind doesn't use a 
flipflop. Very odd...


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Received on 2011-10-30 18:00:18

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