Re: Theorizing: chip select lines... (continued after mistake)

From: Jesus Cea <jcea_at_jcea.es>
Date: Wed, 22 Jun 2022 23:15:23 +0200
Message-ID: <eaf5e35f-b2cc-3562-4ff8-48b0677a09a7_at_jcea.es>
On 22/6/22 21:24, tokafondo_at_tokafondo.name wrote:
> YIKES!!! I pressed 'sent' by mistake and didn't had completed the post!!!

Remember than RAM is accessed twice per cycle: CPU and VIC-II.

If I would design a fast 6502-like accelerator I would interpose a fast 
cache (write thru with a small (maybe 1-2-4 bytes) write buffer) or, 
using something like a 65816, fast and exclusive RAM in other banks.

Dynamically adjusted 6502 frequency will not get you anything useful, 
because 6502 do a memory cycle per CPU clock, always, even when not 
useful at all. Too complicated, too little gain.

-- 
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Received on 2022-06-23 00:02:57

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