Re: C64 board ROM chip spacing

From: Jim Brain <brain_at_jbrain.com>
Date: Thu, 02 May 2013 13:22:32 -0500
Message-ID: <5182AEE8.3080505@jbrain.com>
On 5/2/2013 6:44 AM, silverdr@wfmh.org.pl 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


-- 
Jim Brain
brain@jbrain.com
www.jbrain.com


       Message was sent through the cbm-hackers mailing list
Received on 2013-05-02 19:00:42

Archive generated by hypermail 2.2.0.