Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software - test-drb@ccmp.vtda.org

9 Dec 2005

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Subject: Re: Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software
   From: "Chuck Guzis" <cclist at sydex.com>
   Date: Fri, 09 Dec 2005 10:52:21 -0800
     To: cctalk at classiccmp.org

On 12/9/2005 at 1:38 PM Allison wrote:

 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. 
I thought it was interesting that although IMSAI wouldn't use the NEC 8080A
part on their CPU cards, they freely used it in their floppy controller.
Probably to use up old stock, who knows?

Cheers,
Chuck
(still got one of them old round-lid NECs) 
the FDC was canned code (rom) so they know what it was going to do.
the S100 cpu broke with some basics using the NEC.

Funny thing is the Intel data from '74 may also have been misleading.

Allison