Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software
ajp166 at bellatlantic.net
Fri Dec 9 12:38:46 CST 2005
>Subject: Re: Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software
> From: woodelf <bfranchuk at jetnet.ab.ca>
> Date: Fri, 09 Dec 2005 11:25:09 -0700
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>Chuck Guzis wrote:
>>Hmmm, thought I just said that. One of the more highly-touted performance
>>improvements in the V20/V30 was the implemenation of dual internal data
>>busses. In practice, I don't know if it made a huge difference in speed,
>>but NEC claimed up to a 30% improvement for som operations..
>That was a long time ago ... the XT clone wars. Back then a M$ mouse $100.
>No need to gouge the public with windows /85 :)
>>I thought it interesting that the 8080 emulation of the V20/V30 emulated
>>the Intel 8080A and not tne NEC 8080A instruction set.
>So what instructions did the NEC 8080A have different?
The early NEC 8080 (round lid prior to 77ish) set the flags wrong
I believe it was the sign flag though I'd have to check. After IMSAI
and others dumped them for the big they redesigned to exactly match
the Intel 8080A, NEC part was 8080AF.
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