ajp166 at bellatlantic.net
Tue Nov 20 12:36:41 CST 2007
>Subject: Re: *updating* 8088's
> From: Dave McGuire <mcguire at neurotica.com>
> Date: Tue, 20 Nov 2007 11:43:02 -0500
> To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
>On Nov 19, 2007, at 11:03 PM, Allison wrote:
>> I build with 6 and 10mhz z80s and 12mhz 8085s I have and theres
>> little problem with finding static rams and Eprom (and EEprom)
>> that can keep up.
> Did you say 12MHz 8085? Holy cow! Tell me more?
I meant 6MHz, 12mhz crystal. However, even at 6 its fast.
FYI I tried overclocking a 80C856mhz part and it was still
doing well at 8mhz but I was seeing memory timing issues.
You don't see the 6mhz parts too often. The usual is the
3 and 5mhz and usually the -5 (5mhz) will overclock to 6
with no real issues.
At those speeds it's intereating as old 8080 software is
now at 3X!
Though a 10mhz Z80 is also a nice thing but the 85nS memory
need is something to aware of. That short M1 read cycle
preally beats up ram. Z180 is better and Z84S180s can be
found as fast as 33mhz.
>Port Charlotte, FL
>Farewell Ophelia, 9/22/1991 - 7/25/2007
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