Re: Weird PCB attached to C64 ROM

From: matt <*galaga_at_slingshot.co.nz*> Date: Mon, 20 Feb 2012 17:59:42 +1300 Message-ID: <001d01ccef8c$75201b00$0900a8c0@mattaileens> · galaga_at_slingshot.co.nz

naa pic chip 8-pin

----- Original Message ----- 
From: "Jim Brain" <brain@jbrain.com>
To: <cbm-hackers@musoftware.de>
Sent: Monday, February 20, 2012 10:07 AM
Subject: 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
> 
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