Re: Weird Bank Select PCB attached to C64 ROM

From: donato <*donni_at_com64.com*> Date: Sun, 19 Feb 2012 17:33:06 +0100 Message-ID: <F51A3149E997455CB8FFB366984E3040@qwertyf4d6f7b0> · donni_at_com64.com

It appears to be a bank selector activated with the restore button.
You can see that one wire is going to R17, which is connected to the restore 
button.

-donni

----- Original Message ----- 
From: "Jim Brain" <brain@jbrain.com>
To: <cbm-hackers@musoftware.de>
Sent: Sunday, February 19, 2012 5:20 PM
Subject: Re: Weird Bank Select PCB attached to C64 ROM

> On 2/19/2012 10:09 AM, Jim Brain wrote:
>
> Via translation, I determined it's a bank select circuit, but I am still 
> curious as to how it works.
>> http://allegro.pl/commodore-64-c-2-os-y-i2077847284.html (last 2 
>> pictures)
>>
>> I can see Vcc, Gnd, and /CE of the EPROM, which appears stacked on top of 
>> the original ROM, but the rest eludes me.
>>
>> Jim
>>
>
>
> -- 
> Jim Brain
> brain@jbrain.com
> www.jbrain.com
>
>
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