Re: C64 board ROM chip spacing

From: Jim Brain <>
Date: Thu, 02 May 2013 13:22:32 -0500
Message-ID: <>
On 5/2/2013 6:44 AM, wrote:
> .. and 0.9" in the SX. Also on my SX boards (I am not sure if there 
> were other revisions than 251102A) KERNAL is 28 pin (2564) while the 
> other are regular 901225/6 with 24 pins. My guess is that for the 
> quantities of the SX-64 CBM was able to shifting at the price, it 
> didn't pay to make a new ROM chip. 
Note that you can treat the SX a 2364 24 pin ROM with no ill effects.  
The pinout supports both pinouts (2564/2364), and I send 24 pin 2364 
solutions to folks wanting JiffyDOS for the SX.  In such a situation, 
place the 2364 in pins 3-26 of the socket.


Jim Brain

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Received on 2013-05-02 19:00:42

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