Re: 6510 I/O port as chip selects to expand memory

From: Jim Brain <brain_at_jbrain.com>
Date: Wed, 17 Nov 2021 19:05:18 -0600
Message-ID: <c6ab50ac-53c8-a8bf-f97a-5f81dc919c66_at_jbrain.com> 
On 11/17/2021 5:01 PM, Claudio Sánchez wrote:
> From 6510 datasheet, description section.
>
> "An 8-bit Bi-Directional I/O Port is located on-chip with the Output 
> Register at Address 0001 and the Data-Direction  Register at Address  
> 0000. The  I/O  Port is  bit-by-bit programmable"
>
> Let's forget about the C64, because it has a PLA that has its own 
> behaviour.
>
> Can this I/O port be used in a new design as chip select for memory 
> banking?
>
In a word, Yes.  It's a general IO port.

Jim

-- 
Jim Brain
brain_at_jbrain.com  
www.jbrain.com
Received on 2021-11-18 03:02:49

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