[Info-vax] Intel proposal to simplify x86-64

[Neil Rieck]

On Sunday, June 4, 2023 at 3:31:55 PM UTC-4, John Dallman wrote:
> In article <630361da-4c95-4556... at googlegroups.com>,
> n.r... at bell.net (Neil Rieck) wrote: 
> 
> > As far as the Intel proposal is concerned, "I thought" that 
> > Microsoft has already blocked running 16-bit programs on their 
> > 64-bit OS for a few years now.
> They deliberately left it out of 64-bit Windows from the beginning of 
> that OS. The hardware has been capable of running 16-bit code since AMD 
> first designed x86-64, but Microsoft only exploited that in 32-bit 
> Windows. 
> 
> John

Agreed. It has been a long time since I developed commercial compilable applications for Windows but I seem to recall that Windows developer docs referred to running 8-bit code on a 16-bit OS (or running 16-bit code on a 32-bit OS) as "thunking" (I have no idea why)

Neil Rieck
Waterloo, Ontario, Canada.
http://neilrieck.net
http://neilrieck.net/OpenVMS.html