Re: Weird PCB attached to C64 ROM

On 2/19/2012 2:24 PM, Ruud@Baltissen.org wrote:
> Hallo Craig,
>
>
>> ... it appears to have both J/(P?)iffy Dos
I'm mainly interested in the circuit board on the ROMs and how it 
selects a bank.  The cap/resistor imply a timer of some sort, like a 555 
rigged into a one shot mode, but not sure.

Jim

       Message was sent through the cbm-hackers mailing list